[APDL] Generalized Plane Strain
Hi:
I am running a thermal mechanical analysis using plane 183 generalized
plane strain. Does anyone know if I can specify a constant thickness
in the z-direction and constraint it such that it can only displace by
the same amount (constant total strain in the z-direction)?
Regards
Lance Lim
PhD Candidate
University of Toronto
lancelim@mie.utoronto.ca
Lim,
I had a similar question a couple of months ago and the conclusion was that ANSYS would consider that a 3-D problem. My workaround was to make a 1 (or 2) element thick model with 3-D solid brick elements then couple the z direction nodes so they move together.
If you are using Mechanical, you can add a named selection on the moving face and command snip to couple the nodes together:
cmsel,s,FacesZP,node
cp,next,uz,all
allsel
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.com
-----Original Message-----
From: Lim Liang Ying lancelim@mie.utoronto.ca
Sent: Wednesday, September 22, 2021 1:06 AM
To: Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org
Subject: [Xansys] [APDL] Generalized Plane Strain
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Hi:
I am running a thermal mechanical analysis using plane 183 generalized plane strain. Does anyone know if I can specify a constant thickness in the z-direction and constraint it such that it can only displace by the same amount (constant total strain in the z-direction)?
Regards
Lance Lim
PhD Candidate
University of Toronto
lancelim@mie.utoronto.ca
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
Hi Caba:
Please correct me if I am wrong.
Did you coupled the 2d element to the 3-D solid brick element?
Did you use plane strain or generalized plane strain?
I am quite confused with ANSYS manual description of generalized plane strain.
Are you able to shed some light on selection of the reference point and angle of rotation?
Regards
Lance Lim
PhD Candidate
University of Toronto
lancelim@mie.utoronto.ca
From: Caba, Aaron (US) via Xansys
Sent: Wednesday, 22 September 2021 8:48 AM
To: XANSYS Mailing List Home
Cc: Caba, Aaron (US)
Subject: [Xansys] Re: [APDL] Generalized Plane Strain
Lim,
I had a similar question a couple of months ago and the conclusion was that ANSYS would consider that a 3-D problem. My workaround was to make a 1 (or 2) element thick model with 3-D solid brick elements then couple the z direction nodes so they move together.
If you are using Mechanical, you can add a named selection on the moving face and command snip to couple the nodes together:
cmsel,s,FacesZP,node
cp,next,uz,all
allsel
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.com
-----Original Message-----
From: Lim Liang Ying lancelim@mie.utoronto.ca
Sent: Wednesday, September 22, 2021 1:06 AM
To: Caba, Aaron (US) via Xansys xansys-temp@list.xansys.org
Subject: [Xansys] [APDL] Generalized Plane Strain
External Email Alert
This email has been sent from an account outside of the BAE Systems network.
Please treat the email with caution, especially if you are requested to click on a link, decrypt/open an attachment, or enable macros. For further information on how to spot phishing, access OSI IT Policies and report phishing by forwarding mail to phishing@baesystems.com.
Hi:
I am running a thermal mechanical analysis using plane 183 generalized plane strain. Does anyone know if I can specify a constant thickness in the z-direction and constraint it such that it can only displace by the same amount (constant total strain in the z-direction)?
Regards
Lance Lim
PhD Candidate
University of Toronto
lancelim@mie.utoronto.ca
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.
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Lance,
You need to look closely at your problem to see if it meets all the criteria for a plane stress problem. If your problem needs something other than strain_zz=0 or stress_zz=0 it really isn’t a plane strain or plane stress problem. I haven’t worked with generalized plane strain in a long time so I can’t comment much about its requirements.
I only used 3-D brick elements, so no plane strain or 2-D elements at all. Using a 1-element thick brick model you can enforce the required strains (or stresses or displacements) in the thickness direction with appropriate boundary conditions. A 1-element thick model still runs very fast, just not quite as fast as a true 2-D problem.
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.comhttp://www.baesystems.com/
From: Lance Lim lancelim@mie.utoronto.ca
Sent: Wednesday, September 22, 2021 8:55 AM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Caba, Aaron (US) Aaron.Caba@baesystems.com
Subject: RE: [Xansys] Re: [APDL] Generalized Plane Strain
External Email Alert
This email has been sent from an account outside of the BAE Systems network.
Please treat the email with caution, especially if you are requested to click on a link, decrypt/open an attachment, or enable macros. For further information on how to spot phishing, access OSI IT Policies and report phishing by forwarding mail to phishing@baesystems.commailto:phishing@baesystems.com.
Hi Caba:
Please correct me if I am wrong.
Did you coupled the 2d element to the 3-D solid brick element?
Did you use plane strain or generalized plane strain?
I am quite confused with ANSYS manual description of generalized plane strain.
Are you able to shed some light on selection of the reference point and angle of rotation?
Regards
Lance Lim
PhD Candidate
University of Toronto
lancelim@mie.utoronto.camailto:lancelim@mie.utoronto.ca
From: Caba, Aaron (US) via Xansysmailto:xansys-temp@list.xansys.org
Sent: Wednesday, 22 September 2021 8:48 AM
To: XANSYS Mailing List Homemailto:xansys-temp@list.xansys.org
Cc: Caba, Aaron (US)mailto:Aaron.Caba@baesystems.com
Subject: [Xansys] Re: [APDL] Generalized Plane Strain
Lim,
I had a similar question a couple of months ago and the conclusion was that ANSYS would consider that a 3-D problem. My workaround was to make a 1 (or 2) element thick model with 3-D solid brick elements then couple the z direction nodes so they move together.
If you are using Mechanical, you can add a named selection on the moving face and command snip to couple the nodes together:
cmsel,s,FacesZP,node
cp,next,uz,all
allsel
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.comhttp://www.baesystems.com
-----Original Message-----
From: Lim Liang Ying <lancelim@mie.utoronto.camailto:lancelim@mie.utoronto.ca>
Sent: Wednesday, September 22, 2021 1:06 AM
To: Caba, Aaron (US) via Xansys <xansys-temp@list.xansys.orgmailto:xansys-temp@list.xansys.org>
Subject: [Xansys] [APDL] Generalized Plane Strain
External Email Alert
This email has been sent from an account outside of the BAE Systems network.
Please treat the email with caution, especially if you are requested to click on a link, decrypt/open an attachment, or enable macros. For further information on how to spot phishing, access OSI IT Policies and report phishing by forwarding mail to phishing@baesystems.commailto:phishing@baesystems.com.
Hi:
I am running a thermal mechanical analysis using plane 183 generalized plane strain. Does anyone know if I can specify a constant thickness in the z-direction and constraint it such that it can only displace by the same amount (constant total strain in the z-direction)?
Regards
Lance Lim
PhD Candidate
University of Toronto
lancelim@mie.utoronto.camailto:lancelim@mie.utoronto.ca
Xansys mailing list -- xansys-temp@list.xansys.orgmailto:xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.orgmailto: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.ukmailto:xansys-mod@tynecomp.co.uk and not to the list
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Hi Aaron:
Thanks for your help
Regards
Lance
From: Caba, Aaron (US) via Xansys
Sent: Wednesday, 22 September 2021 9:30 AM
To: XANSYS Mailing List Home
Cc: Caba, Aaron (US)
Subject: [Xansys] Re: [APDL] Generalized Plane Strain
Lance,
You need to look closely at your problem to see if it meets all the criteria for a plane stress problem. If your problem needs something other than strain_zz=0 or stress_zz=0 it really isn’t a plane strain or plane stress problem. I haven’t worked with generalized plane strain in a long time so I can’t comment much about its requirements.
I only used 3-D brick elements, so no plane strain or 2-D elements at all. Using a 1-element thick brick model you can enforce the required strains (or stresses or displacements) in the thickness direction with appropriate boundary conditions. A 1-element thick model still runs very fast, just not quite as fast as a true 2-D problem.
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.comhttp://www.baesystems.com/
From: Lance Lim lancelim@mie.utoronto.ca
Sent: Wednesday, September 22, 2021 8:55 AM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Caba, Aaron (US) Aaron.Caba@baesystems.com
Subject: RE: [Xansys] Re: [APDL] Generalized Plane Strain
External Email Alert
This email has been sent from an account outside of the BAE Systems network.
Please treat the email with caution, especially if you are requested to click on a link, decrypt/open an attachment, or enable macros. For further information on how to spot phishing, access OSI IT Policies and report phishing by forwarding mail to phishing@baesystems.commailto:phishing@baesystems.com.
Hi Caba:
Please correct me if I am wrong.
Did you coupled the 2d element to the 3-D solid brick element?
Did you use plane strain or generalized plane strain?
I am quite confused with ANSYS manual description of generalized plane strain.
Are you able to shed some light on selection of the reference point and angle of rotation?
Regards
Lance Lim
PhD Candidate
University of Toronto
lancelim@mie.utoronto.camailto:lancelim@mie.utoronto.ca
From: Caba, Aaron (US) via Xansysmailto:xansys-temp@list.xansys.org
Sent: Wednesday, 22 September 2021 8:48 AM
To: XANSYS Mailing List Homemailto:xansys-temp@list.xansys.org
Cc: Caba, Aaron (US)mailto:Aaron.Caba@baesystems.com
Subject: [Xansys] Re: [APDL] Generalized Plane Strain
Lim,
I had a similar question a couple of months ago and the conclusion was that ANSYS would consider that a 3-D problem. My workaround was to make a 1 (or 2) element thick model with 3-D solid brick elements then couple the z direction nodes so they move together.
If you are using Mechanical, you can add a named selection on the moving face and command snip to couple the nodes together:
cmsel,s,FacesZP,node
cp,next,uz,all
allsel
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.comhttp://www.baesystems.com
-----Original Message-----
From: Lim Liang Ying <lancelim@mie.utoronto.camailto:lancelim@mie.utoronto.ca>
Sent: Wednesday, September 22, 2021 1:06 AM
To: Caba, Aaron (US) via Xansys <xansys-temp@list.xansys.orgmailto:xansys-temp@list.xansys.org>
Subject: [Xansys] [APDL] Generalized Plane Strain
External Email Alert
This email has been sent from an account outside of the BAE Systems network.
Please treat the email with caution, especially if you are requested to click on a link, decrypt/open an attachment, or enable macros. For further information on how to spot phishing, access OSI IT Policies and report phishing by forwarding mail to phishing@baesystems.commailto:phishing@baesystems.com.
Hi:
I am running a thermal mechanical analysis using plane 183 generalized plane strain. Does anyone know if I can specify a constant thickness in the z-direction and constraint it such that it can only displace by the same amount (constant total strain in the z-direction)?
Regards
Lance Lim
PhD Candidate
University of Toronto
lancelim@mie.utoronto.camailto:lancelim@mie.utoronto.ca
Xansys mailing list -- xansys-temp@list.xansys.orgmailto:xansys-temp@list.xansys.org To unsubscribe send an email to xansys-temp-leave@list.xansys.orgmailto: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.ukmailto:xansys-mod@tynecomp.co.uk and not to the list
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