Extracting Contact Reaction Forces and Moments in APDL
Folks,
I have a 3D shell model in Mechanical with various MPC bonded contact pairs. In DS.DAT, the elements are TARGE170 and CONTA175. In Mechanical Solution, I can extract Force and Moment reactions for the contact pairs using the "contact underlying element" extraction method. I would like to extract the same force and moment reactions in APDL for this model.
ESEL,S,TYPE,,MyContactElements !Select the CONTA175 contact elements
RSYS,MyCoordSys !Specify my coordinate system for summation
SPOINT,,0,-5.625,8.125 !Specify the moment summation point
FSUM,RSYS,CONT !Sum the force and moments
I get all zeroes though. Can anyone share some feedback on what I'm doing wrong?
Matt Ridzon, PE, MSME
Sr. Engineering Analyst
Email matt@prime-engineer.commailto:matt@prime-engineer.com
Mail 266 Main St, Burlington, VT 05401
Web www.prime-engineer.comhttp://www.prime-engineer.com/
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PRIME ENGINEERING LLC
This message (including any attachments) may contain confidential, proprietary, privileged and/or private information. The information is intended to be for the use of the individual or entity designated above. If you are not the intended recipient of this message, please notify the sender immediately, and delete the message and any attachments. Any disclosure, reproduction, distribution or other use of this message or any attachments by an individual or entity other than the intended recipient is prohibited.
Do you also need the underlying shells selected, too?
Thanks,
Jim
[cid:image001.png@01DB8EA9.B2AF6D20]
James J. Patterson, PhD.
Principal Vehicle Systems Engineer
Trailer Commercial Vehicle Systems
2070 Industrial Place S.E. Canton, OH 44707
ph. 330 489 0095 | fax 330 489 1961
jpatterson@hendrickson-intl.commailto:jpatterson@hendrickson-intl.com
www.hendrickson-intl.com
[cid:image002.gif@01DB8EA9.B2AF6D20]
From: Matthew Ridzon, PE via Xansys xansys-temp@list.xansys.org
Sent: Thursday, March 6, 2025 3:05 PM
To: xansys-temp@list.xansys.org
Cc: Matthew Ridzon, PE Matt@prime-engineer.com
Subject: [Xansys] Extracting Contact Reaction Forces and Moments in APDL
Folks, I have a 3D shell model in Mechanical with various MPC bonded contact pairs. In DS. DAT, the elements are TARGE170 and CONTA175. In Mechanical Solution, I can extract Force and Moment reactions for the contact pairs using the "contact
Folks,
I have a 3D shell model in Mechanical with various MPC bonded contact pairs. In DS.DAT, the elements are TARGE170 and CONTA175. In Mechanical Solution, I can extract Force and Moment reactions for the contact pairs using the "contact underlying element" extraction method. I would like to extract the same force and moment reactions in APDL for this model.
ESEL,S,TYPE,,MyContactElements !Select the CONTA175 contact elements
RSYS,MyCoordSys !Specify my coordinate system for summation
SPOINT,,0,-5.625,8.125 !Specify the moment summation point
FSUM,RSYS,CONT !Sum the force and moments
I get all zeroes though. Can anyone share some feedback on what I'm doing wrong?
Matt Ridzon, PE, MSME
Sr. Engineering Analyst
Email matt@prime-engineer.com<mailto:matt@prime-engineer.commailto:matt@prime-engineer.com%3cmailto:matt@prime-engineer.com>
Mail 266 Main St, Burlington, VT 05401
Web https://urldefense.com/v3/http://www.prime-engineer.com;!!HXcklc0VomgEZw!4lSsArWBDGCMGq5ninfJNETrKqbWsgISQJfKK-rE6IABHhlQEiacW44VlJoDEFFpgEYn-n6buF2vyM3VX7ln3mwIU3JghyJKhh4$https://urldefense.com/v3/__http:/www.prime-engineer.com__;!!HXcklc0VomgEZw!4lSsArWBDGCMGq5ninfJNETrKqbWsgISQJfKK-rE6IABHhlQEiacW44VlJoDEFFpgEYn-n6buF2vyM3VX7ln3mwIU3JghyJKhh4$<https://urldefense.com/v3/http://www.prime-engineer.com/;!!HXcklc0VomgEZw!4lSsArWBDGCMGq5ninfJNETrKqbWsgISQJfKK-rE6IABHhlQEiacW44VlJoDEFFpgEYn-n6buF2vyM3VX7ln3mwIU3JgopO-WZY$https://urldefense.com/v3/__http:/www.prime-engineer.com/__;!!HXcklc0VomgEZw!4lSsArWBDGCMGq5ninfJNETrKqbWsgISQJfKK-rE6IABHhlQEiacW44VlJoDEFFpgEYn-n6buF2vyM3VX7ln3mwIU3JgopO-WZY$>
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*edit (the server jumbled up my APDL script in the original email)
ESEL,S,TYPE,,MyContactElements !Select the CONTA175 contact elements
RSYS,MyCoordSys !Specify my coordinate system for summation
SPOINT,,0,-5.625,8.125 !Specify the moment summation point
FSUM,RSYS,CONT !Sum the force and moments
-Matt
-----Original Message-----
From: Matthew Ridzon, PE via Xansys xansys-temp@list.xansys.org
Sent: Thursday, March 6, 2025 3:05 PM
To: xansys-temp@list.xansys.org
Cc: Matthew Ridzon, PE Matt@prime-engineer.com
Subject: [Xansys] Extracting Contact Reaction Forces and Moments in APDL
Folks,
I have a 3D shell model in Mechanical with various MPC bonded contact pairs. In DS.DAT, the elements are TARGE170 and CONTA175. In Mechanical Solution, I can extract Force and Moment reactions for the contact pairs using the "contact underlying element" extraction method. I would like to extract the same force and moment reactions in APDL for this model.
ESEL,S,TYPE,,MyContactElements !Select the CONTA175 contact elements RSYS,MyCoordSys !Specify my coordinate system for summation
SPOINT,,0,-5.625,8.125 !Specify the moment summation point FSUM,RSYS,CONT !Sum the force and moments
I get all zeroes though. Can anyone share some feedback on what I'm doing wrong?
Matt Ridzon, PE, MSME
Sr. Engineering Analyst
Email matt@prime-engineer.commailto:matt@prime-engineer.com
Mail 266 Main St, Burlington, VT 05401
Web www.prime-engineer.comhttp://www.prime-engineer.com/
[A blue hexagon with white letters Description automatically generated] PRIME ENGINEERING LLC
This message (including any attachments) may contain confidential, proprietary, privileged and/or private information. The information is intended to be for the use of the individual or entity designated above. If you are not the intended recipient of this message, please notify the sender immediately, and delete the message and any attachments. Any disclosure, reproduction, distribution or other use of this message or any attachments by an individual or entity other than the intended recipient is prohibited.
Hi Matt,
Make sure to ensure outputs include nodal forces.
Also, you are missing the shell elements and node selections based on what
I am seeing .
Esel,,type,, contact elem
Nsle
Esln
SPOINT,,0,-5.625,8.125
Rsys,my coord
Fsum,rsys
Thanks,
Nelson
On Thu, Mar 6, 2025 at 12:06 PM Matthew Ridzon, PE via Xansys <
xansys-temp@list.xansys.org> wrote:
Folks,
I have a 3D shell model in Mechanical with various MPC bonded contact
pairs. In DS.DAT, the elements are TARGE170 and CONTA175. In Mechanical
Solution, I can extract Force and Moment reactions for the contact pairs
using the "contact underlying element" extraction method. I would like to
extract the same force and moment reactions in APDL for this model.
ESEL,S,TYPE,,MyContactElements !Select the CONTA175 contact elements
RSYS,MyCoordSys !Specify my coordinate system for summation
SPOINT,,0,-5.625,8.125 !Specify the moment summation point
FSUM,RSYS,CONT !Sum the force and moments
I get all zeroes though. Can anyone share some feedback on what I'm doing
wrong?
Matt Ridzon, PE, MSME
Sr. Engineering Analyst
Email matt@prime-engineer.commailto:matt@prime-engineer.com
Mail 266 Main St, Burlington, VT 05401
Web www.prime-engineer.comhttp://www.prime-engineer.com/
[A blue hexagon with white letters Description automatically generated]
PRIME ENGINEERING LLC
This message (including any attachments) may contain confidential,
proprietary, privileged and/or private information. The information is
intended to be for the use of the individual or entity designated above. If
you are not the intended recipient of this message, please notify the
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Thank you Nelson! That did the trick.
—Matt
-----Original Message-----
From: Nelson Ho via Xansys xansys-temp@list.xansys.org
Sent: Thursday, March 6, 2025 3:17 PM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Nelson Ho nelsonho567@gmail.com
Subject: [Xansys] Re: Extracting Contact Reaction Forces and Moments in APDL
Hi Matt,
Make sure to ensure outputs include nodal forces.
Also, you are missing the shell elements and node selections based on what I am seeing .
Esel,,type,, contact elem
Nsle
Esln
SPOINT,,0,-5.625,8.125
Rsys,my coord
Fsum,rsys
Thanks,
Nelson
On Thu, Mar 6, 2025 at 12:0 PM Matthew Ridzon, PE via Xansys < xansys-temp@list.xansys.org> wrote:
Folks,
I have a 3D shell model in Mechanical with various MPC bonded contact
pairs. In DS.DAT, the elements are TARGE170 and CONTA175. In
Mechanical Solution, I can extract Force and Moment reactions for the
contact pairs using the "contact underlying element" extraction
method. I would like to extract the same force and moment reactions in APDL for this model.
ESEL,S,TYPE,,MyContactElements !Select the CONTA175 contact elements
RSYS,MyCoordSys !Specify my coordinate system for summation
SPOINT,,0,-5.625,8.125 !Specify the moment summation point
FSUM,RSYS,CONT !Sum the force and moments
I get all zeroes though. Can anyone share some feedback on what I'm
doing wrong?
Matt Ridzon, PE, MSME
Sr. Engineering Analyst
Email matt@prime-engineer.commailto:matt@prime-engineer.com
Mail 266 Main St, Burlington, VT 05401
Web www.prime-engineer.comhttp://www.prime-engineer.com/
[A blue hexagon with white letters Description automatically
generated] PRIME ENGINEERING LLC
This message (including any attachments) may contain confidential,
proprietary, privileged and/or private information. The information is
intended to be for the use of the individual or entity designated
above. If you are not the intended recipient of this message, please
notify the sender immediately, and delete the message and any
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of this message or any attachments by an individual or entity other
than the intended recipient is prohibited.
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Nelson's revisions to the script do get those underlying shells when ESLN is issued. I ran a quick test in APDL with the GUI to verify. And the results make sense on a simple test model. :-)
—Matt
-----Original Message-----
From: Patterson, James via Xansys xansys-temp@list.xansys.org
Sent: Thursday, March 6, 2025 3:09 PM
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Patterson, James jpatterson@hendrickson-intl.com
Subject: [Xansys] Re: Extracting Contact Reaction Forces and Moments in APDL
Do you also need the underlying shells selected, too?
Thanks,
Jim
[cid:image001.png@01DB8EA9.B2AF6D20]
James J. Patterson, PhD.
Principal Vehicle Systems Engineer
Trailer Commercial Vehicle Systems
2070 Industrial Place S.E. Canton, OH 44707
ph. 330 489 0095 | fax 330 489 1961
jpatterson@hendrickson-intl.commailto:jpatterson@hendrickson-intl.com
www.hendrickson-intl.com
[cid:image002.gif@01DB8EA9.B2AF6D20]
From: Matthew Ridzon, PE via Xansys xansys-temp@list.xansys.org
Sent: Thursday, March 6, 2025 3:05 PM
To: xansys-temp@list.xansys.org
Cc: Matthew Ridzon, PE Matt@prime-engineer.com
Subject: [Xansys] Extracting Contact Reaction Forces and Moments in APDL
Folks, I have a 3D shell model in Mechanical with various MPC bonded contact pairs. In DS. DAT, the elements are TARGE170 and CONTA175. In Mechanical Solution, I can extract Force and Moment reactions for the contact pairs using the "contact
Folks,
I have a 3D shell model in Mechanical with various MPC bonded contact pairs. In DS.DAT, the elements are TARGE170 and CONTA175. In Mechanical Solution, I can extract Force and Moment reactions for the contact pairs using the "contact underlying element" extraction method. I would like to extract the same force and moment reactions in APDL for this model.
ESEL,S,TYPE,,MyContactElements !Select the CONTA175 contact elements
RSYS,MyCoordSys !Specify my coordinate system for summation
SPOINT,,0,-5.625,8.125 !Specify the moment summation point
FSUM,RSYS,CONT !Sum the force and moments
I get all zeroes though. Can anyone share some feedback on what I'm doing wrong?
Matt Ridzon, PE, MSME
Sr. Engineering Analyst
Email matt@prime-engineer.com<mailto:matt@prime-engineer.commailto:matt@prime-engineer.com%3cmailto:matt@prime-engineer.com>
Mail 266 Main St, Burlington, VT 05401
Web https://urldefense.com/v3/http://www.prime-engineer.com;!!HXcklc0VomgEZw!4lSsArWBDGCMGq5ninfJNETrKqbWsgISQJfKK-rE6IABHhlQEiacW44VlJoDEFFpgEYn-n6buF2vyM3VX7ln3mwIU3JghyJKhh4$https://urldefense.com/v3/__http:/www.prime-engineer.com__;!!HXcklc0VomgEZw!4lSsArWBDGCMGq5ninfJNETrKqbWsgISQJfKK-rE6IABHhlQEiacW44VlJoDEFFpgEYn-n6buF2vyM3VX7ln3mwIU3JghyJKhh4$<https://urldefense.com/v3/http://www.prime-engineer.com/;!!HXcklc0VomgEZw!4lSsArWBDGCMGq5ninfJNETrKqbWsgISQJfKK-rE6IABHhlQEiacW44VlJoDEFFpgEYn-n6buF2vyM3VX7ln3mwIU3JgopO-WZY$https://urldefense.com/v3/__http:/www.prime-engineer.com/__;!!HXcklc0VomgEZw!4lSsArWBDGCMGq5ninfJNETrKqbWsgISQJfKK-rE6IABHhlQEiacW44VlJoDEFFpgEYn-n6buF2vyM3VX7ln3mwIU3JgopO-WZY$>
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PRIME ENGINEERING LLC
This message (including any attachments) may contain confidential, proprietary, privileged and/or private information. The information is intended to be for the use of the individual or entity designated above. If you are not the intended recipient of this message, please notify the sender immediately, and delete the message and any attachments. Any disclosure, reproduction, distribution or other use of this message or any attachments by an individual or entity other than the intended recipient is prohibited.
The contents of this message may be privileged and confidential. Therefore, if this message has been received in error, please delete it without reading it. Your receipt of this message is not intended to waive any applicable privilege. Please do not disseminate this message without the permission of the author.