Rate-dependent "elastic properties"
Dear XANSYS experts,
Something has been bugging me for a while now, why it isn't possible to
define "rate-dependent elastic properties", like Young's modulus (or
maybe Poisson's ratio) in ANSYS? Because we all know that higher
deformation rate ends up with greater values of the elastic modulus, and
that influence sometimes can be significant.
I have been noticing lately that people are having a great deal of focus on
such rate dependency. In the electronic packaging world, lots of papers are
reporting elastic properties at various strain rate values for different
interconnection materials (SACs, Sintered Silver, Sintered Cu, and so on).
Any comment would be greatly appreciated!
Best Regards,
Mohammad
---====
Mohammad A Gharaibeh, Ph.D.
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
---====
I'd guess that it's because this sort of analysis is better handled with an
explicit code like LS-Dyna. Most people don't do rate dependency with
implicit codes because of the prohibitive run time.
Joseph T Metrisin
Structures Lead
1701 Military Tr. Suite 110 | Jupiter, FL 33458 USA
+1 (561)427-6346 Office | +1 (772)834-4156 Mobile
Joe.Metrisin@kratosdefense.com
Visit our website: https://kratosdefense.com
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-----Original Message-----
From: Mohammad Gharaibeh via Xansys xansys-temp@list.xansys.org
Sent: Tuesday, June 2, 2026 7:51 AM
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Cc: Mohammad Gharaibeh mgharai1@binghamton.edu
Subject: [External] - [Xansys] Rate-dependent "elastic properties"
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Dear XANSYS experts,
Something has been bugging me for a while now, why it isn't possible to
define "rate-dependent elastic properties", like Young's modulus (or maybe
Poisson's ratio) in ANSYS? Because we all know that higher deformation rate
ends up with greater values of the elastic modulus, and that influence
sometimes can be significant.
I have been noticing lately that people are having a great deal of focus on
such rate dependency. In the electronic packaging world, lots of papers are
reporting elastic properties at various strain rate values for different
interconnection materials (SACs, Sintered Silver, Sintered Cu, and so on).
Any comment would be greatly appreciated!
Best Regards,
Mohammad
---====
Mohammad A Gharaibeh, Ph.D.
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
---====
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Dear Mohammad,
You can add a Prony-Series to your elastic model viscoelasticity or you could consider using Bergstrom-Boyce.
Curve fitting is also available.
Best Regards,
Henning Schütte
Prof. Dr.-Ing. Henning Schütte
Structural Mechanics
Rhine-Waal University of Applied Sciences Kleve
08.02.008
Marie Curie Straße 1
47533 Kleve
Germany
Henning.Schuette@HSRW.eu
-----Original Message-----
From: Mohammad Gharaibeh via Xansys xansys-temp@list.xansys.org
Sent: Tuesday, 2 June 2026 13:51
To: XANSYS Mailing List Home xansys-temp@list.xansys.org
Cc: Mohammad Gharaibeh mgharai1@binghamton.edu
Subject: [!EXTERN] [Xansys] Rate-dependent "elastic properties"
Dear XANSYS experts,
Something has been bugging me for a while now, why it isn't possible to define "rate-dependent elastic properties", like Young's modulus (or maybe Poisson's ratio) in ANSYS? Because we all know that higher deformation rate ends up with greater values of the elastic modulus, and that influence sometimes can be significant.
I have been noticing lately that people are having a great deal of focus on such rate dependency. In the electronic packaging world, lots of papers are reporting elastic properties at various strain rate values for different interconnection materials (SACs, Sintered Silver, Sintered Cu, and so on).
Any comment would be greatly appreciated!
Best Regards,
Mohammad
---====
Mohammad A Gharaibeh, Ph.D.
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
---====
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
Thank you Joe and Henning for commenting.
In fact, I was looking for something to define rate-dependent stiffening
behavior of metallic alloys. I should have mentioned that I use MAPDL.
I want to do thermal cycling of an electronic package with a solder alloy
that has elastic modulus for different loading temperatures and different
strain rates. Also, for the inelastic part of the curve ANAND model
parameters are to be plugged in. The analysis is static, nonlinear, and
large deformations are ON.
For defining elastic modulus for various temperatures, it is pretty
straightforward with MPTEMP and MPDATA - is there something similar for
rate-dependent modulus (like an MPRATE)? After defining the temperature and
rate - dependent elasticity, I want to define ANAND model parameters (this
is pretty straightforward).
Thoughts?
Thanks,
Mohamad
---====
Mohammad A Gharaibeh, Ph.D.
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
---====