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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Plastic strain and initial strain state

Posted Aug 28, 2012, 2:49 p.m. EDT MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Materials, Parameters, Variables, & Functions, Structural Mechanics Version 4.3 2 Replies

Marty Shipley
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Good day, This model involves two structural mechanics physics interfaces with stationary solutions. I can pass the strain state from the first physics as an initial strain setting using variables such as solid.eX, solid.eXY...solid.eZ. Because the first physics produces both elastic and plastic strains I curious what is required to ensure both are transferred. Can these same variables be used or do they need to be augmented. For example should solid.eX be replaced by solid.eX+solid.epX.

I'd appreciate any insight you may have.
Marty
2 Replies Last Post Apr 25, 2015, 8:30 a.m. EDT
Marty Shipley
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Posted: 1 decade ago Aug 29, 2012, 10:51 a.m. EDT
Good Day, Henrik at customer support for COMSOL provided the following clarification:

"As to your second question: Which strain to use as initial strain would in
general depend on application. The expression strain.eX+strain.epX is
however suspect, since strain.eX is the total strain, which already
contains the plastic strain.

Regards,
Henrik"

Many thanks COMSOL support!
Good Day, Henrik at customer support for COMSOL provided the following clarification: "As to your second question: Which strain to use as initial strain would in general depend on application. The expression strain.eX+strain.epX is however suspect, since strain.eX is the total strain, which already contains the plastic strain. Regards, Henrik" Many thanks COMSOL support!
Nor Syamimi
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Posted: 10 years ago Apr 25, 2015, 8:30 a.m. EDT
Hi, im currently doing a simulation to calculate the strain of 2D and 3D model... i am confused with the term solid.eX, solid.eY.. as i know,eX, eY, and eZ are the normal element... it is means that it only can be used if i aplly normal load? so..for 2D and 3D model...which operator will give me total strain, if i wanted to apply Fx,Fy and Fz.. thanxs
Hi, im currently doing a simulation to calculate the strain of 2D and 3D model... i am confused with the term solid.eX, solid.eY.. as i know,eX, eY, and eZ are the normal element... it is means that it only can be used if i aplly normal load? so..for 2D and 3D model...which operator will give me total strain, if i wanted to apply Fx,Fy and Fz.. thanxs

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