Empathy List Archives

xansys-temp@list.xansys.org

XANSYS Mailing List Home

Internal Stress from Mechanical

Matthew Ridzon, PE

Mon, Aug 19, 2024 8:10 PM

Folks,

In APDL, PowerGraphics ON reports stress results only for the skin of the model, whereas PowerGraphics OFF reports everything (i.e., skin and internal). I artificially created this scenario in APDL with a test model having an internal heat source; the results were drastically different with PowerGraphics ON versus OFF. In Mechanical, it has always been my understanding that it also only reports the skin. And the GUI button in Mechanical for displaying results is called "external," which insinuates internal results are ignored. But in my artificial test model in Mechanical, the data reported on the screen behaves like PowerGraphics OFF, showing skin and internal results.

Can anyone confirm if Mechanical is reporting stress results for only the skin of the model, and thereby ignoring internal stresses?

Matt Ridzon, PE, MSME
Sr. Engineering Analyst

Email matt@prime-engineer.com mailto:matt@prime-engineer.com
Mail 266 Main St, Burlington, VT 05401
Web www.prime-engineer.com http://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.

Folks, In APDL, PowerGraphics ON reports stress results only for the skin of the model, whereas PowerGraphics OFF reports everything (i.e., skin and internal). I artificially created this scenario in APDL with a test model having an internal heat source; the results were drastically different with PowerGraphics ON versus OFF. In Mechanical, it has always been my understanding that it also only reports the skin. And the GUI button in Mechanical for displaying results is called "external," which insinuates internal results are ignored. But in my artificial test model in Mechanical, the data reported on the screen behaves like PowerGraphics OFF, showing skin and internal results. Can anyone confirm if Mechanical is reporting stress results for only the skin of the model, and thereby ignoring internal stresses? Matt Ridzon, PE, MSME Sr. Engineering Analyst Email matt@prime-engineer.com<mailto:matt@prime-engineer.com> Mail 266 Main St, Burlington, VT 05401 Web www.prime-engineer.com<http://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.

Bohlen, Dan (GE Aerospace, US)

Thu, Aug 22, 2024 4:59 PM

Hi Matt,

As you first stated below - that's my understanding of the difference between the two graphics plots.

Frankly, I won't rely on it to quote final results. If I needed to report the surface "results" - I would probably use surface effect elements to find what is going on. Also, I would think (not 100% sure) that if you did a *GET on the nodal results that would return the proper result.

All that being said - I typically view results with full graphics as that is all there was when I got into the biz.

Dan Bohlen
Senior Engineer, Stress Analysis
STAR review chairman, military structures
GE Aerospace
1 Neumann Way
Evendale, OH 45215 USA

-----Original Message-----
From: Matthew Ridzon, PE via Xansys xansys-temp@list.xansys.org
Sent: Monday, August 19, 2024 4:10 PM
To: xansys-temp@list.xansys.org
Cc: Matthew Ridzon, PE Matt@prime-engineer.com
Subject: EXT: [Xansys] Internal Stress from Mechanical

WARNING: This email originated from outside of GE. Please validate the sender's email address before clicking on links or attachments as they may not be safe.

Folks,

Can anyone confirm if Mechanical is reporting stress results for only the skin of the model, and thereby ignoring internal stresses?

Matt Ridzon, PE, MSME
Sr. Engineering Analyst

Hi Matt, As you first stated below - that's my understanding of the difference between the two graphics plots. Frankly, I won't rely on it to quote final results. If I needed to report the surface "results" - I would probably use surface effect elements to find what is going on. Also, I would think (not 100% sure) that if you did a *GET on the nodal results that would return the proper result. All that being said - I typically view results with full graphics as that is all there was when I got into the biz. Dan Bohlen Senior Engineer, Stress Analysis STAR review chairman, military structures GE Aerospace 1 Neumann Way Evendale, OH 45215 USA -----Original Message----- From: Matthew Ridzon, PE via Xansys <xansys-temp@list.xansys.org> Sent: Monday, August 19, 2024 4:10 PM To: xansys-temp@list.xansys.org Cc: Matthew Ridzon, PE <Matt@prime-engineer.com> Subject: EXT: [Xansys] Internal Stress from Mechanical WARNING: This email originated from outside of GE. Please validate the sender's email address before clicking on links or attachments as they may not be safe. Folks, In APDL, PowerGraphics ON reports stress results only for the skin of the model, whereas PowerGraphics OFF reports everything (i.e., skin and internal). I artificially created this scenario in APDL with a test model having an internal heat source; the results were drastically different with PowerGraphics ON versus OFF. In Mechanical, it has always been my understanding that it also only reports the skin. And the GUI button in Mechanical for displaying results is called "external," which insinuates internal results are ignored. But in my artificial test model in Mechanical, the data reported on the screen behaves like PowerGraphics OFF, showing skin and internal results. Can anyone confirm if Mechanical is reporting stress results for only the skin of the model, and thereby ignoring internal stresses? Matt Ridzon, PE, MSME Sr. Engineering Analyst Email matt@prime-engineer.com<mailto:matt@prime-engineer.com> Mail 266 Main St, Burlington, VT 05401 Web www.prime-engineer.com<http://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.