Empathy List Archives

MA

marko.aalto@deltamarin.com

Wed, Feb 19, 2025 1:18 PM

Hello All

I have a shell model of a large car carrier (length = 220 metres), model consists of shell181 and beam 188 elements. I need to apply a constant unit bending moment MY over the length of the model.

At both ends of the model there are planar cross-sections which contain the necessary nodes for the moment input. I know the position of the neutral axes at these cross-sections.

I would like to apply a unit bending moment MY on one node only (at the neutral axis position per cross-section) and rotate the complete cross-section with this moment, while the cross section would stay planar (but nodes are free to move along the plane).

In effect this means that the planar end cross-sections would be rotated about their neutral axes by the unit moments.

Looking through the ANSYS commands (and xansys archive), I did not find a way to do this using coupling or constraint equations functionalities.

So the question is, if anybody has found a way to do this?

Any help is appreciated,

BR Marko

Hello All I have a shell model of a large car carrier (length = 220 metres), model consists of shell181 and beam 188 elements. I need to apply a constant unit bending moment MY over the length of the model. At both ends of the model there are planar cross-sections which contain the necessary nodes for the moment input. I know the position of the neutral axes at these cross-sections. I would like to apply a unit bending moment MY on one node only (at the neutral axis position per cross-section) and rotate the complete cross-section with this moment, while the cross section would stay planar (but nodes are free to move along the plane). In effect this means that the planar end cross-sections would be rotated about their neutral axes by the unit moments. Looking through the ANSYS commands (and xansys archive), I did not find a way to do this using coupling or constraint equations functionalities. So the question is, if anybody has found a way to do this? Any help is appreciated, BR Marko

MR

Matthew Ridzon, PE

Wed, Feb 19, 2025 1:38 PM

Hello! Are you doing this in Mechanical or APDL? If Mechanical, I think this could be done by assigning a Remote Displacement to the planar face. Ensure its located directly on the neutral axis of the planar face. Then specify the unit moment for the remote displacement. As far as the face remaining planar, two ideas come to mind:

Define the face in the Geometry branch as "rigid" instead of "flexible"
OR...
The Remote Point should give you the option to define Rigid or Deformable behavior. If you choose Rigid, I believe it will treat the plate as rigid like you want.

If I was doing this in APDL, I cannot remember how to build remote displacements therein. Therefore, I would first build a small test model in Mechanical and then study the DS.DAT file to see how the solver built the remote displacement. Then I could reproduce it in APDL.

One last thing...You mentioned a moment on each end. I think it would be the same to fix one end and apply the moment to the other end. I'm thinking about simple beam theory from college. If one end of a beam is fixed and a moment applied to the other end, the entire beam experiences the same moment along the length.

-Matt

-----Original Message-----
From: Marko Aalto via Xansys xansys-temp@list.xansys.org
Sent: Wednesday, February 19, 2025 8:18 AM
To: xansys-temp@list.xansys.org
Cc: marko.aalto@deltamarin.com
Subject: [Xansys] [APDL] Applying planar rotation at the end of a structural model

Hello All

I have a shell model of a large car carrier (length = 220 metres), model consists of shell181 and beam 188 elements. I need to apply a constant unit bending moment MY over the length of the model.

At both ends of the model there are planar cross-sections which contain the necessary nodes for the moment input. I know the position of the neutral axes at these cross-sections.

I would like to apply a unit bending moment MY on one node only (at the neutral axis position per cross-section) and rotate the complete cross-section with this moment, while the cross section would stay planar (but nodes are free to move along the plane).

In effect this means that the planar end cross-sections would be rotated about their neutral axes by the unit moments.

Looking through the ANSYS commands (and xansys archive), I did not find a way to do this using coupling or constraint equations functionalities.

So the question is, if anybody has found a way to do this?

Any help is appreciated,

BR Marko

Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day.

Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list

Hello! Are you doing this in Mechanical or APDL? If Mechanical, I think this could be done by assigning a Remote Displacement to the planar face. Ensure its located directly on the neutral axis of the planar face. Then specify the unit moment for the remote displacement. As far as the face remaining planar, two ideas come to mind: * Define the face in the Geometry branch as "rigid" instead of "flexible" OR... * The Remote Point should give you the option to define Rigid or Deformable behavior. If you choose Rigid, I believe it will treat the plate as rigid like you want. If I was doing this in APDL, I cannot remember how to build remote displacements therein. Therefore, I would first build a small test model in Mechanical and then study the DS.DAT file to see how the solver built the remote displacement. Then I could reproduce it in APDL. One last thing...You mentioned a moment on each end. I think it would be the same to fix one end and apply the moment to the other end. I'm thinking about simple beam theory from college. If one end of a beam is fixed and a moment applied to the other end, the entire beam experiences the same moment along the length. -Matt -----Original Message----- From: Marko Aalto via Xansys <xansys-temp@list.xansys.org> Sent: Wednesday, February 19, 2025 8:18 AM To: xansys-temp@list.xansys.org Cc: marko.aalto@deltamarin.com Subject: [Xansys] [APDL] Applying planar rotation at the end of a structural model Hello All I have a shell model of a large car carrier (length = 220 metres), model consists of shell181 and beam 188 elements. I need to apply a constant unit bending moment MY over the length of the model. At both ends of the model there are planar cross-sections which contain the necessary nodes for the moment input. I know the position of the neutral axes at these cross-sections. I would like to apply a unit bending moment MY on one node only (at the neutral axis position per cross-section) and rotate the complete cross-section with this moment, while the cross section would stay planar (but nodes are free to move along the plane). In effect this means that the planar end cross-sections would be rotated about their neutral axes by the unit moments. Looking through the ANSYS commands (and xansys archive), I did not find a way to do this using coupling or constraint equations functionalities. So the question is, if anybody has found a way to do this? Any help is appreciated, BR Marko _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list

MG

Mohammad Gharaibeh

Wed, Feb 19, 2025 2:22 PM

From my experience with ANSYS, direct application of moment is not
possible. However, there are some work arounds like remembering that the
moment is the multiplication of the force by the distance (M=F.d). So, if
you know the distance from the fixed support to the load application
location, a unity moment can be equivalently defined as (F=1/d).

I hope this helps.

Best,
Mohammad

---====
Mohammad A Gharaibeh, Ph.D.
Associate Professor
Department of Mechanical Engineering
The Hashemite University
P.O. Box 330127
Zarqa, 13133, Jordan
Tel: +962 - 5 - 390 3333 Ext. 4771
Fax: +962 - 5 - 382 6348

---====

On Wed, 19 Feb 2025 at 4:19 PM Marko Aalto via Xansys <
xansys-temp@list.xansys.org> wrote:

Hello All

I have a shell model of a large car carrier (length = 220 metres), model
consists of shell181 and beam 188 elements. I need to apply a constant unit
bending moment MY over the length of the model.

At both ends of the model there are planar cross-sections which contain
the necessary nodes for the moment input. I know the position of the
neutral axes at these cross-sections.

I would like to apply a unit bending moment MY on one node only (at the
neutral axis position per cross-section) and rotate the complete
cross-section with this moment, while the cross section would stay planar
(but nodes are free to move along the plane).

In effect this means that the planar end cross-sections would be rotated
about their neutral axes by the unit moments.

Looking through the ANSYS commands (and xansys archive), I did not find a
way to do this using coupling or constraint equations functionalities.

So the question is, if anybody has found a way to do this?

Any help is appreciated,

BR Marko

Xansys mailing list -- xansys-temp@list.xansys.org
To unsubscribe send an email to xansys-temp-leave@list.xansys.org
If you are receiving too many emails from XANSYS please consider changing
account settings to Digest mode which will send a single email per day.

Please send administrative requests such as deletion from XANSYS to
xansys-mod@tynecomp.co.uk and not to the list

From my experience with ANSYS, direct application of moment is not possible. However, there are some work arounds like remembering that the moment is the multiplication of the force by the distance (M=F.d). So, if you know the distance from the fixed support to the load application location, a unity moment can be equivalently defined as (F=1/d). I hope this helps. Best, Mohammad ===================================== Mohammad A Gharaibeh, Ph.D. Associate Professor Department of Mechanical Engineering The Hashemite University P.O. Box 330127 Zarqa, 13133, Jordan Tel: +962 - 5 - 390 3333 Ext. 4771 Fax: +962 - 5 - 382 6348 ===================================== On Wed, 19 Feb 2025 at 4:19 PM Marko Aalto via Xansys < xansys-temp@list.xansys.org> wrote: > Hello All > > I have a shell model of a large car carrier (length = 220 metres), model > consists of shell181 and beam 188 elements. I need to apply a constant unit > bending moment MY over the length of the model. > > At both ends of the model there are planar cross-sections which contain > the necessary nodes for the moment input. I know the position of the > neutral axes at these cross-sections. > > I would like to apply a unit bending moment MY on one node only (at the > neutral axis position per cross-section) and rotate the complete > cross-section with this moment, while the cross section would stay planar > (but nodes are free to move along the plane). > > In effect this means that the planar end cross-sections would be rotated > about their neutral axes by the unit moments. > > Looking through the ANSYS commands (and xansys archive), I did not find a > way to do this using coupling or constraint equations functionalities. > > So the question is, if anybody has found a way to do this? > > Any help is appreciated, > > BR Marko > _______________________________________________ > Xansys mailing list -- xansys-temp@list.xansys.org > To unsubscribe send an email to xansys-temp-leave@list.xansys.org > If you are receiving too many emails from XANSYS please consider changing > account settings to Digest mode which will send a single email per day. > > Please send administrative requests such as deletion from XANSYS to > xansys-mod@tynecomp.co.uk and not to the list >

KH

KAZI Hassan -ENTENG

Wed, Feb 19, 2025 2:43 PM

I tend to believe moment can be applied by using remote force / remote moment feature. It has been a while I looked into it and cannot recall the details. Check it out.

[Ontario Power Generation logo] Hassan Kazi
9053029636

From: Mohammad Gharaibeh via Xansys xansys-temp@list.xansys.org
Sent: Wednesday, February 19, 2025 9:22 AM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Mohammad Gharaibeh mgharai1@binghamton.edu
Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model

From my experience with ANSYS, direct application of moment is not
possible. However, there are some work arounds like remembering that the
moment is the multiplication of the force by the distance (M=F.d). So, if
you know the distance from the fixed support to the load application
location, a unity moment can be equivalently defined as (F=1/d).

I hope this helps.

Best,
Mohammad

---====
Mohammad A Gharaibeh, Ph.D.
Associate Professor
Department of Mechanical Engineering
The Hashemite University
P.O. Box 330127
Zarqa, 13133, Jordan
Tel: +962 - 5 - 390 3333 Ext. 4771
Fax: +962 - 5 - 382 6348

---====

On Wed, 19 Feb 2025 at 4:19 PM Marko Aalto via Xansys <
xansys-temp@list.xansys.org> wrote:

Hello All

I have a shell model of a large car carrier (length = 220 metres), model
consists of shell181 and beam 188 elements. I need to apply a constant unit
bending moment MY over the length of the model.

At both ends of the model there are planar cross-sections which contain
the necessary nodes for the moment input. I know the position of the
neutral axes at these cross-sections.

I would like to apply a unit bending moment MY on one node only (at the
neutral axis position per cross-section) and rotate the complete
cross-section with this moment, while the cross section would stay planar
(but nodes are free to move along the plane).

In effect this means that the planar end cross-sections would be rotated
about their neutral axes by the unit moments.

Looking through the ANSYS commands (and xansys archive), I did not find a
way to do this using coupling or constraint equations functionalities.

So the question is, if anybody has found a way to do this?

Any help is appreciated,

BR Marko

Xansys mailing list -- xansys-temp@list.xansys.org
To unsubscribe send an email to xansys-temp-leave@list.xansys.org
If you are receiving too many emails from XANSYS please consider changing
account settings to Digest mode which will send a single email per day.

Please send administrative requests such as deletion from XANSYS to
xansys-mod@tynecomp.co.uk and not to the list

Xansys mailing list -- xansys-temp@list.xansys.org
To unsubscribe send an email to xansys-temp-leave@list.xansys.org
If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day.

Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list

THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete this message from your system. Ontario Power Generation Inc.

I tend to believe moment can be applied by using remote force / remote moment feature. It has been a while I looked into it and cannot recall the details. Check it out. [Ontario Power Generation logo] Hassan Kazi 9053029636 ________________________________ From: Mohammad Gharaibeh via Xansys <xansys-temp@list.xansys.org> Sent: Wednesday, February 19, 2025 9:22 AM To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Cc: Mohammad Gharaibeh <mgharai1@binghamton.edu> Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model From my experience with ANSYS, direct application of moment is not possible. However, there are some work arounds like remembering that the moment is the multiplication of the force by the distance (M=F.d). So, if you know the distance from the fixed support to the load application location, a unity moment can be equivalently defined as (F=1/d). I hope this helps. Best, Mohammad ===================================== Mohammad A Gharaibeh, Ph.D. Associate Professor Department of Mechanical Engineering The Hashemite University P.O. Box 330127 Zarqa, 13133, Jordan Tel: +962 - 5 - 390 3333 Ext. 4771 Fax: +962 - 5 - 382 6348 ===================================== On Wed, 19 Feb 2025 at 4:19 PM Marko Aalto via Xansys < xansys-temp@list.xansys.org> wrote: > Hello All > > I have a shell model of a large car carrier (length = 220 metres), model > consists of shell181 and beam 188 elements. I need to apply a constant unit > bending moment MY over the length of the model. > > At both ends of the model there are planar cross-sections which contain > the necessary nodes for the moment input. I know the position of the > neutral axes at these cross-sections. > > I would like to apply a unit bending moment MY on one node only (at the > neutral axis position per cross-section) and rotate the complete > cross-section with this moment, while the cross section would stay planar > (but nodes are free to move along the plane). > > In effect this means that the planar end cross-sections would be rotated > about their neutral axes by the unit moments. > > Looking through the ANSYS commands (and xansys archive), I did not find a > way to do this using coupling or constraint equations functionalities. > > So the question is, if anybody has found a way to do this? > > Any help is appreciated, > > BR Marko > _______________________________________________ > Xansys mailing list -- xansys-temp@list.xansys.org > To unsubscribe send an email to xansys-temp-leave@list.xansys.org > If you are receiving too many emails from XANSYS please consider changing > account settings to Digest mode which will send a single email per day. > > Please send administrative requests such as deletion from XANSYS to > xansys-mod@tynecomp.co.uk and not to the list > _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list ________________________________ THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete this message from your system. Ontario Power Generation Inc.

CM

Carli, Matteo

Wed, Feb 19, 2025 2:59 PM

Check RBE3 command, hope this helps

RBE3, Master, DOF, Slaves, Wtfact
Distributes the force/moment applied at the master node to a set of slave nodes, taking into account the geometry of the slave nodes as well as weighting factors.

Matteo Carli
Lead Mechanical Engineer – Condition Based Maintenance (Lifing models, CBM Online, Finite elements modelling)
Industrial & Energy Technology - Gas Services Engineering
Baker Hughes

T +39 (0)55 423 2119 | M +39 339 562 7528

-----Original Message-----
From: KAZI Hassan -ENTENG via Xansys xansys-temp@list.xansys.org
Sent: Wednesday, February 19, 2025 3:44 PM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: KAZI Hassan -ENTENG hassan.kazi@opg.com
Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model

EXTERNAL EMAIL: This email originated outside of our organization. Do not click on any links or open attachments from unexpected or unknown senders unless you can verify the content is safe.

I tend to believe moment can be applied by using remote force / remote moment feature. It has been a while I looked into it and cannot recall the details. Check it out.

[Ontario Power Generation logo] Hassan Kazi
9053029636

From: Mohammad Gharaibeh via Xansys xansys-temp@list.xansys.org
Sent: Wednesday, February 19, 2025 9:22 AM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Mohammad Gharaibeh mgharai1@binghamton.edu
Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model

From my experience with ANSYS, direct application of moment is not possible. However, there are some work arounds like remembering that the moment is the multiplication of the force by the distance (M=F.d). So, if you know the distance from the fixed support to the load application location, a unity moment can be equivalently defined as (F=1/d).

I hope this helps.

Best,
Mohammad

---====
Mohammad A Gharaibeh, Ph.D.
Associate Professor
Department of Mechanical Engineering
The Hashemite University
P.O. Box 330127
Zarqa, 13133, Jordan
Tel: +962 - 5 - 390 3333 Ext. 4771
Fax: +962 - 5 - 382 6348

---====

On Wed, 19 Feb 2025 at 4:19 PM Marko Aalto via Xansys < xansys-temp@list.xansys.org> wrote:

Hello All

I have a shell model of a large car carrier (length = 220 metres),
model consists of shell181 and beam 188 elements. I need to apply a
constant unit bending moment MY over the length of the model.

At both ends of the model there are planar cross-sections which
contain the necessary nodes for the moment input. I know the position
of the neutral axes at these cross-sections.

I would like to apply a unit bending moment MY on one node only (at
the neutral axis position per cross-section) and rotate the complete
cross-section with this moment, while the cross section would stay
planar (but nodes are free to move along the plane).

In effect this means that the planar end cross-sections would be
rotated about their neutral axes by the unit moments.

Looking through the ANSYS commands (and xansys archive), I did not
find a way to do this using coupling or constraint equations functionalities.

So the question is, if anybody has found a way to do this?

Any help is appreciated,

BR Marko

Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send
an email to xansys-temp-leave@list.xansys.org If you are receiving too
many emails from XANSYS please consider changing account settings to
Digest mode which will send a single email per day.

Please send administrative requests such as deletion from XANSYS to
xansys-mod@tynecomp.co.uk and not to the list

Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day.

Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list

THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete this message from your system. Ontario Power Generation Inc.

Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day.

Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list

Check RBE3 command, hope this helps RBE3, Master, DOF, Slaves, Wtfact Distributes the force/moment applied at the master node to a set of slave nodes, taking into account the geometry of the slave nodes as well as weighting factors. Matteo Carli Lead Mechanical Engineer – Condition Based Maintenance (Lifing models, CBM Online, Finite elements modelling) Industrial & Energy Technology - Gas Services Engineering Baker Hughes T +39 (0)55 423 2119 | M +39 339 562 7528 -----Original Message----- From: KAZI Hassan -ENTENG via Xansys <xansys-temp@list.xansys.org> Sent: Wednesday, February 19, 2025 3:44 PM To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Cc: KAZI Hassan -ENTENG <hassan.kazi@opg.com> Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model EXTERNAL EMAIL: This email originated outside of our organization. Do not click on any links or open attachments from unexpected or unknown senders unless you can verify the content is safe. I tend to believe moment can be applied by using remote force / remote moment feature. It has been a while I looked into it and cannot recall the details. Check it out. [Ontario Power Generation logo] Hassan Kazi 9053029636 ________________________________ From: Mohammad Gharaibeh via Xansys <xansys-temp@list.xansys.org> Sent: Wednesday, February 19, 2025 9:22 AM To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Cc: Mohammad Gharaibeh <mgharai1@binghamton.edu> Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model From my experience with ANSYS, direct application of moment is not possible. However, there are some work arounds like remembering that the moment is the multiplication of the force by the distance (M=F.d). So, if you know the distance from the fixed support to the load application location, a unity moment can be equivalently defined as (F=1/d). I hope this helps. Best, Mohammad ===================================== Mohammad A Gharaibeh, Ph.D. Associate Professor Department of Mechanical Engineering The Hashemite University P.O. Box 330127 Zarqa, 13133, Jordan Tel: +962 - 5 - 390 3333 Ext. 4771 Fax: +962 - 5 - 382 6348 ===================================== On Wed, 19 Feb 2025 at 4:19 PM Marko Aalto via Xansys < xansys-temp@list.xansys.org> wrote: > Hello All > > I have a shell model of a large car carrier (length = 220 metres), > model consists of shell181 and beam 188 elements. I need to apply a > constant unit bending moment MY over the length of the model. > > At both ends of the model there are planar cross-sections which > contain the necessary nodes for the moment input. I know the position > of the neutral axes at these cross-sections. > > I would like to apply a unit bending moment MY on one node only (at > the neutral axis position per cross-section) and rotate the complete > cross-section with this moment, while the cross section would stay > planar (but nodes are free to move along the plane). > > In effect this means that the planar end cross-sections would be > rotated about their neutral axes by the unit moments. > > Looking through the ANSYS commands (and xansys archive), I did not > find a way to do this using coupling or constraint equations functionalities. > > So the question is, if anybody has found a way to do this? > > Any help is appreciated, > > BR Marko > _______________________________________________ > Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send > an email to xansys-temp-leave@list.xansys.org If you are receiving too > many emails from XANSYS please consider changing account settings to > Digest mode which will send a single email per day. > > Please send administrative requests such as deletion from XANSYS to > xansys-mod@tynecomp.co.uk and not to the list > _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list ________________________________ THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete this message from your system. Ontario Power Generation Inc. _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list

DG

David GALINDO - Pharea

Wed, Feb 19, 2025 4:17 PM

Moment is applicable to one node by F command, and distributed to other nodes by using RBE3 command, as previously suggested, or CERIG, or rigid wheel.

David Galindo
Chief Executive
PHAREA
+33 (0)4 37 66 11 40

-----Message d'origine-----
De : Carli, Matteo via Xansys xansys-temp@list.xansys.org
Envoyé : mercredi 19 février 2025 15:59
À : XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc : Carli, Matteo matteo.carli@bakerhughes.com
Objet : [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model

Check RBE3 command, hope this helps

RBE3, Master, DOF, Slaves, Wtfact
Distributes the force/moment applied at the master node to a set of slave nodes, taking into account the geometry of the slave nodes as well as weighting factors.

Matteo Carli
Lead Mechanical Engineer – Condition Based Maintenance (Lifing models, CBM Online, Finite elements modelling) Industrial & Energy Technology - Gas Services Engineering Baker Hughes

T +39 (0)55 423 2119 | M +39 339 562 7528

-----Original Message-----
From: KAZI Hassan -ENTENG via Xansys xansys-temp@list.xansys.org
Sent: Wednesday, February 19, 2025 3:44 PM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: KAZI Hassan -ENTENG hassan.kazi@opg.com
Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model

EXTERNAL EMAIL: This email originated outside of our organization. Do not click on any links or open attachments from unexpected or unknown senders unless you can verify the content is safe.

I tend to believe moment can be applied by using remote force / remote moment feature. It has been a while I looked into it and cannot recall the details. Check it out.

[Ontario Power Generation logo] Hassan Kazi
9053029636

From: Mohammad Gharaibeh via Xansys xansys-temp@list.xansys.org
Sent: Wednesday, February 19, 2025 9:22 AM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Mohammad Gharaibeh mgharai1@binghamton.edu
Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model

From my experience with ANSYS, direct application of moment is not possible. However, there are some work arounds like remembering that the moment is the multiplication of the force by the distance (M=F.d). So, if you know the distance from the fixed support to the load application location, a unity moment can be equivalently defined as (F=1/d).

I hope this helps.

Best,
Mohammad

---====
Mohammad A Gharaibeh, Ph.D.
Associate Professor
Department of Mechanical Engineering
The Hashemite University
P.O. Box 330127
Zarqa, 13133, Jordan
Tel: +962 - 5 - 390 3333 Ext. 4771
Fax: +962 - 5 - 382 6348

---====

On Wed, 19 Feb 2025 at 4:19 PM Marko Aalto via Xansys < xansys-temp@list.xansys.org> wrote:

Hello All

I have a shell model of a large car carrier (length = 220 metres),
model consists of shell181 and beam 188 elements. I need to apply a
constant unit bending moment MY over the length of the model.

At both ends of the model there are planar cross-sections which
contain the necessary nodes for the moment input. I know the position
of the neutral axes at these cross-sections.

I would like to apply a unit bending moment MY on one node only (at
the neutral axis position per cross-section) and rotate the complete
cross-section with this moment, while the cross section would stay
planar (but nodes are free to move along the plane).

In effect this means that the planar end cross-sections would be
rotated about their neutral axes by the unit moments.

Looking through the ANSYS commands (and xansys archive), I did not
find a way to do this using coupling or constraint equations functionalities.

So the question is, if anybody has found a way to do this?

Any help is appreciated,

BR Marko

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THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete this message from your system. Ontario Power Generation Inc.

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Moment is applicable to one node by F command, and distributed to other nodes by using RBE3 command, as previously suggested, or CERIG, or rigid wheel. David Galindo Chief Executive PHAREA +33 (0)4 37 66 11 40 -----Message d'origine----- De : Carli, Matteo via Xansys <xansys-temp@list.xansys.org> Envoyé : mercredi 19 février 2025 15:59 À : XANSYS Mailing List Home <xansys-temp@list.xansys.org> Cc : Carli, Matteo <matteo.carli@bakerhughes.com> Objet : [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model Check RBE3 command, hope this helps RBE3, Master, DOF, Slaves, Wtfact Distributes the force/moment applied at the master node to a set of slave nodes, taking into account the geometry of the slave nodes as well as weighting factors. Matteo Carli Lead Mechanical Engineer – Condition Based Maintenance (Lifing models, CBM Online, Finite elements modelling) Industrial & Energy Technology - Gas Services Engineering Baker Hughes T +39 (0)55 423 2119 | M +39 339 562 7528 -----Original Message----- From: KAZI Hassan -ENTENG via Xansys <xansys-temp@list.xansys.org> Sent: Wednesday, February 19, 2025 3:44 PM To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Cc: KAZI Hassan -ENTENG <hassan.kazi@opg.com> Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model EXTERNAL EMAIL: This email originated outside of our organization. Do not click on any links or open attachments from unexpected or unknown senders unless you can verify the content is safe. I tend to believe moment can be applied by using remote force / remote moment feature. It has been a while I looked into it and cannot recall the details. Check it out. [Ontario Power Generation logo] Hassan Kazi 9053029636 ________________________________ From: Mohammad Gharaibeh via Xansys <xansys-temp@list.xansys.org> Sent: Wednesday, February 19, 2025 9:22 AM To: XANSYS Mailing List Home <xansys-temp@list.xansys.org> Cc: Mohammad Gharaibeh <mgharai1@binghamton.edu> Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model From my experience with ANSYS, direct application of moment is not possible. However, there are some work arounds like remembering that the moment is the multiplication of the force by the distance (M=F.d). So, if you know the distance from the fixed support to the load application location, a unity moment can be equivalently defined as (F=1/d). I hope this helps. Best, Mohammad ===================================== Mohammad A Gharaibeh, Ph.D. Associate Professor Department of Mechanical Engineering The Hashemite University P.O. Box 330127 Zarqa, 13133, Jordan Tel: +962 - 5 - 390 3333 Ext. 4771 Fax: +962 - 5 - 382 6348 ===================================== On Wed, 19 Feb 2025 at 4:19 PM Marko Aalto via Xansys < xansys-temp@list.xansys.org> wrote: > Hello All > > I have a shell model of a large car carrier (length = 220 metres), > model consists of shell181 and beam 188 elements. I need to apply a > constant unit bending moment MY over the length of the model. > > At both ends of the model there are planar cross-sections which > contain the necessary nodes for the moment input. I know the position > of the neutral axes at these cross-sections. > > I would like to apply a unit bending moment MY on one node only (at > the neutral axis position per cross-section) and rotate the complete > cross-section with this moment, while the cross section would stay > planar (but nodes are free to move along the plane). > > In effect this means that the planar end cross-sections would be > rotated about their neutral axes by the unit moments. > > Looking through the ANSYS commands (and xansys archive), I did not > find a way to do this using coupling or constraint equations functionalities. > > So the question is, if anybody has found a way to do this? > > Any help is appreciated, > > BR Marko > _______________________________________________ > Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send > an email to xansys-temp-leave@list.xansys.org If you are receiving too > many emails from XANSYS please consider changing account settings to > Digest mode which will send a single email per day. > > Please send administrative requests such as deletion from XANSYS to > xansys-mod@tynecomp.co.uk and not to the list > _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list ________________________________ THIS MESSAGE IS ONLY INTENDED FOR THE USE OF THE INTENDED RECIPIENT(S) AND MAY CONTAIN INFORMATION THAT IS PRIVILEGED, PROPRIETARY AND/OR CONFIDENTIAL. If you are not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying, conversion to hard copy or other use of this communication is strictly prohibited. If you are not the intended recipient and have received this message in error, please notify me by return e-mail and delete this message from your system. Ontario Power Generation Inc. _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list

MA

marko.aalto@deltamarin.com

Thu, Feb 20, 2025 1:24 PM

The RBE3 seems the command I need here, thank you very much!

Need to experiment with it though once I have more time for that, first results I got show local deformation at/near the independent node which should not be there if the complete cross-section is rotated by a plane.

Concerning one reply where it was mentioned that fixing the other end DOF would do the same as applying moments at both ends…I believe that if other end fixed like a cantilever beam then there will be a reaction force + moment at the fixed end - and I want to have a ‘pure’ bending moment without the shear force.

Thank you All!

Marko Aalto, M.Sc.

Project Discipline Manager, Hull FEA & Rule calculations

Deltamarin Ltd, Postikatu 2, FI-20250 Turku, Finland, www.deltamarin.com
Tel. +358 40 7648098

The RBE3 seems the command I need here, thank you very much! Need to experiment with it though once I have more time for that, first results I got show local deformation at/near the independent node which should not be there if the complete cross-section is rotated by a plane. Concerning one reply where it was mentioned that fixing the other end DOF would do the same as applying moments at both ends…I believe that if other end fixed like a cantilever beam then there will be a reaction force + moment at the fixed end - and I want to have a ‘pure’ bending moment without the shear force. Thank you All! Marko Aalto, M.Sc. \ Project Discipline Manager, Hull FEA & Rule calculations Deltamarin Ltd, Postikatu 2, FI-20250 Turku, Finland, [www.deltamarin.com](http://www.deltamarin.com/)\ Tel. +358 40 7648098

MR

Matthew Ridzon, PE

Thu, Feb 20, 2025 3:06 PM

"I believe that if other end fixed like a cantilever beam then there will be a reaction force + moment at the fixed end - and I want to have a ‘pure’ bending moment without the shear force."
There should be no shear force whatsoever, anywhere in the beam including the fixed end, if the beam is loaded with a pure moment at the cantilevered end. A shear/moment diagram from beam statics would reveal this.

Nevertheless, best of luck. Keep us updated on your progress! ;-)

—Matt

-----Original Message-----
From: Marko Aalto via Xansys xansys-temp@list.xansys.org
Sent: Thursday, February 20, 2025 8:25 AM
To: xansys-temp@list.xansys.org
Cc: marko.aalto@deltamarin.com
Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model

The RBE3 seems the command I need here, thank you very much!

Need to experiment with it though once I have more time for that, first results I got show local deformation at/near the independent node which should not be there if the complete cross-section is rotated by a plane.

Concerning one reply where it was mentioned that fixing the other end DOF would do the same as applying moments at both ends…I believe that if other end fixed like a cantilever beam then there will be a reaction force + moment at the fixed end - and I want to have a ‘pure’ bending moment without the shear force.

Thank you All!

Marko Aalto, M.Sc.

Project Discipline Manager, Hull FEA & Rule calculations

Deltamarin Ltd, Postikatu 2, FI-20250 Turku, Finland, www.deltamarin.com
Tel. +358 40 7648098

Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day.

Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list

"I believe that if other end fixed like a cantilever beam then there will be a reaction force + moment at the fixed end - and I want to have a ‘pure’ bending moment without the shear force." There should be no shear force whatsoever, anywhere in the beam including the fixed end, if the beam is loaded with a pure moment at the cantilevered end. A shear/moment diagram from beam statics would reveal this. Nevertheless, best of luck. Keep us updated on your progress! ;-) —Matt -----Original Message----- From: Marko Aalto via Xansys <xansys-temp@list.xansys.org> Sent: Thursday, February 20, 2025 8:25 AM To: xansys-temp@list.xansys.org Cc: marko.aalto@deltamarin.com Subject: [Xansys] Re: [External Email] [APDL] Applying planar rotation at the end of a structural model The RBE3 seems the command I need here, thank you very much! Need to experiment with it though once I have more time for that, first results I got show local deformation at/near the independent node which should not be there if the complete cross-section is rotated by a plane. Concerning one reply where it was mentioned that fixing the other end DOF would do the same as applying moments at both ends…I believe that if other end fixed like a cantilever beam then there will be a reaction force + moment at the fixed end - and I want to have a ‘pure’ bending moment without the shear force. Thank you All! Marko Aalto, M.Sc. \ Project Discipline Manager, Hull FEA & Rule calculations Deltamarin Ltd, Postikatu 2, FI-20250 Turku, Finland, [www.deltamarin.com](http://www.deltamarin.com/)\ Tel. +358 40 7648098 _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.org If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list

MA

marko.aalto@deltamarin.com

Fri, Feb 21, 2025 5:29 AM

Matt, yes you are right, there would be no reaction force at the fixed end, just checked this from the textbook.

- Marko

Matt, yes you are right, there would be no reaction force at the fixed end, just checked this from the textbook. \- Marko

MA

marko.aalto@deltamarin.com

Fri, Feb 21, 2025 11:35 AM

Now got the constant moment model working for a simple prismatic model, below commands listing.

Next task is to reverse the moment direction in one end to produce a constant shear force. If I just reverse the moment direction in this same listing then there will be deformation at the location of the ‘independent’ nodes where the reaction forces are developed.

Need to experiment with the RBE3 dof to see if this can be fixed. If anyone knows a trick how to keep the end sections undeformed pls let me know,

-Marko

FINISH

/CLEAR

/PREP7

K,,0,0,0

,,0,1000,0

,,0,2000,0

KGEN,3,1,3,1,0,0,2500

L,1,2

,2,3

,4,5

,5,6

,7,8

,8,9

,1,4

,4,7

,2,5

,5,8

,3,6

,6,9

LGEN,2,1,12,1,20000,0,0

A,1,2,11,10

,2,3,12,11

,4,5,14,13

,5,6,15,14

,7,8,17,16

,8,9,18,17

,1,4,13,10

,4,7,16,13

,3,6,15,12

,6,9,18,15

!,2,5,14,11

!*,5,8,17,14

ET,1,181

SECTYPE,,SHELL

SECDATA,10

MPTEMP,,,,,,,,

MPTEMP,1,0

MPDATA,EX,1,,206000

MPDATA,PRXY,1,,.3

AESIZE,ALL,500

NKPT,,ALL

AMESH,ALL

NUMMRG,ALL,ALL

!* Aft end

N_AFT=5

N_FORE=14

NSEL,S,LOC,X,0

RBE3,N_AFT,ROTY,ALL

!* Fore end

ALLSEL,ALL

NSEL,S,LOC,X,20000

RBE3,N_FORE,ROTY,ALL

!* Loads - Unit moments MY

ALLSEL,ALL

D,N_AFT,UX,0

D,N_AFT,UY,0

D,N_AFT,UZ,0

!*,N_AFT,ROTX,0

!*,N_FORE,UY,0

D,N_FORE,UZ,0

F,N_AFT,MY,1000

F,N_FORE,MY,-1000

LSWRITE,1

FINI

/SOLU

SOLVE

FINI

/POST1

SET,1

/VIEW,1,,1

/ANG,1

/PBC,M,,2

/PBC,NFOR,,1

PLDI,1

Now got the constant moment model working for a simple prismatic model, below commands listing. Next task is to reverse the moment direction in one end to produce a constant shear force. If I just reverse the moment direction in this same listing then there will be deformation at the location of the ‘independent’ nodes where the reaction forces are developed. Need to experiment with the RBE3 dof to see if this can be fixed. If anyone knows a trick how to keep the end sections undeformed pls let me know, \-Marko FINISH /CLEAR /PREP7 K,,0,0,0 ,,0,1000,0 ,,0,2000,0 KGEN,3,1,3,1,0,0,2500 L,1,2 ,2,3 ,4,5 ,5,6 ,7,8 ,8,9 ,1,4 ,4,7 ,2,5 ,5,8 ,3,6 ,6,9 LGEN,2,1,12,1,20000,0,0 A,1,2,11,10 ,2,3,12,11 ,4,5,14,13 ,5,6,15,14 ,7,8,17,16 ,8,9,18,17 ,1,4,13,10 ,4,7,16,13 ,3,6,15,12 ,6,9,18,15 !,2,5,14,11 !\*,5,8,17,14 ET,1,181 SECTYPE,,SHELL SECDATA,10 MPTEMP,,,,,,,, MPTEMP,1,0 MPDATA,EX,1,,206000 MPDATA,PRXY,1,,.3 AESIZE,ALL,500 NKPT,,ALL AMESH,ALL NUMMRG,ALL,ALL !\* Aft end N_AFT=5 N_FORE=14 NSEL,S,LOC,X,0 RBE3,N_AFT,ROTY,ALL !\* Fore end ALLSEL,ALL NSEL,S,LOC,X,20000 RBE3,N_FORE,ROTY,ALL !\* Loads - Unit moments MY ALLSEL,ALL D,N_AFT,UX,0 D,N_AFT,UY,0 D,N_AFT,UZ,0 !\*,N_AFT,ROTX,0 !\*,N_FORE,UY,0 D,N_FORE,UZ,0 F,N_AFT,MY,1000 F,N_FORE,MY,-1000 LSWRITE,1 FINI /SOLU SOLVE FINI /POST1 SET,1 /VIEW,1,,1 /ANG,1 /PBC,M,,2 /PBC,NFOR,,1 PLDI,1