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Temperature dependent stress strain data interpretation
 
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jaspreet.hothi
User


Joined: 21 Oct 2008
Posts: 56
Location: Calgary, Canada

PostPosted: Thu May 08, 2014 12:09 pm  Reply with quote

Hi,
The question is how does Ansys interpret the temperature dependent stress-strain data in a multilinear kniematic hardening material model. More specifically if I input the stress-strain data for only temperature 100C and my model sees a temperature of 75C. How are the corresponding stress strain data values evaluated for the parts that are at 75C. Note that I have data at no other temperature except 100C.

Any insight in this matter is appreciated. Thanks
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Jaspreet Hothi P. Eng
Sr Stress and Vibration Engineer
AP Dynamics Inc
608 - 7th Street SW, Calgary T2P 1Z2, AB, Canada
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rick.fischer
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Joined: 31 Aug 2011
Posts: 198

PostPosted: Fri May 09, 2014 5:01 am  Reply with quote

If material properties are input for only one temperature, I believe Ansys ignores temperature dependence and uses those properties for all temperatures. Logically, what else could it do? Build a simple model with your material data and run it at 100 and 1000 degrees, and see if there is any difference.

Rick Fischer
Principal Engineer
Argonne National Laboratory

-----Original Message-----
From: Xansys [mailto:xansys-bounces@xansys.org] On Behalf Of jaspreet.hothi
Sent: Thursday, May 08, 2014 2:10 PM
To: xansys@xansys.org
Subject: [Xansys] Temperature dependent stress strain data interpretation

Hi,
The question is how does Ansys interpret the temperature dependent stress-strain data in a multilinear kniematic hardening material model. More specifically if I input the stress-strain data for only temperature 100C and my model sees a temperature of 75C. How are the corresponding stress strain data values evaluated for the parts that are at 75C. Note that I have data at no other temperature except 100C.

Any insight in this matter is appreciated. Thanks

------------------------
Jaspreet Hothi P. Eng
Sr Stress and Vibration Engineer
AP Dynamics Inc
608 - 7th Street SW, Calgary T2P 1Z2, AB, Canada






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Rick Fischer
Principal Engineer
Argonne National Laboratory
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ayo.brimmo
User


Joined: 01 Jul 2013
Posts: 38
Location: Masdar City, Abu Dhabi

PostPosted: Sat May 10, 2014 5:03 am  Reply with quote

What I would do to convince myself is:
- Build a simple model;
- Input stress-strain data for 100C;
- Impose 75C temperatures and some structural load;
- Plot the stress-strain results at each node;
- Observe the trend.

Best,
Ayo Brimmo
Masdar
UAE
-----Original Message-----
From: Xansys [mailto:xansys-bounces@xansys.org] On Behalf Of jaspreet.hothi
Sent: Thursday, May 08, 2014 2:10 PM
To: xansys@xansys.org
Subject: [Xansys] Temperature dependent stress strain data interpretation

Hi,
The question is how does Ansys interpret the temperature dependent stress-strain data in a multilinear kniematic hardening material model. More specifically if I input the stress-strain data for only temperature 100C and my model sees a temperature of 75C. How are the corresponding stress strain data values evaluated for the parts that are at 75C. Note that I have data at no other temperature except 100C.

Any insight in this matter is appreciated. Thanks

------------------------
Jaspreet Hothi P. Eng
Sr Stress and Vibration Engineer
AP Dynamics Inc
608 - 7th Street SW, Calgary T2P 1Z2, AB, Canada






+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
+-------------------------------------------------------------+
+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
+-------------------------------------------------------------+
+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
+-------------------------------------------------------------+

Post generated using Mail2Forum (http://www.mail2forum.com)
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Ayo Brimmo
Research Engineer
Masdar Institute of Science and Technology
UAE.
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berkan.oeztuerk
User


Joined: 12 Apr 2012
Posts: 37
Location: Germany

PostPosted: Mon May 12, 2014 6:54 am  Reply with quote

Hi,
if you input 100C and 50C and your analysis is at 75C, ansys will linearly interpolate the material parameters/data (one has to be careful here if logarithmic data is used).
If you input only 100C, then ansys will use 100C material data for all temperatures (means: ignoring T-dependence)

Mit freundlichen Gren / Best regards

Berkan Oeztuerk
Robert Bosch GmbH


-----Original Message-----
From: Xansys [mailto:xansys-bounces@xansys.org] On Behalf Of jaspreet.hothi
Sent: Donnerstag, 8. Mai 2014 21:10
To: xansys@xansys.org
Subject: [Xansys] Temperature dependent stress strain data interpretation

Hi,
The question is how does Ansys interpret the temperature dependent stress-strain data in a multilinear kniematic hardening material model. More specifically if I input the stress-strain data for only temperature 100C and my model sees a temperature of 75C. How are the corresponding stress strain data values evaluated for the parts that are at 75C. Note that I have data at no other temperature except 100C.

Any insight in this matter is appreciated. Thanks

------------------------
Jaspreet Hothi P. Eng
Sr Stress and Vibration Engineer
AP Dynamics Inc
608 - 7th Street SW, Calgary T2P 1Z2, AB, Canada






+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
+-------------------------------------------------------------+
+-------------------------------------------------------------+
| XANSYS web - www.xansys.org/forum |
| The Online Community for users of ANSYS, Inc. Software |
| Hosted by PADT - www.padtinc.com |
| Send administrative requests to xansys-mod@tynecomp.co.uk |
+-------------------------------------------------------------+

Post generated using Mail2Forum (http://www.mail2forum.com)
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Best Regards,
Berkan
Robert Bosch GmbH (AE)
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