Brad,

Use the *ELASTIC command to specify your initial Young's modulus then use the *PLASTIC
command to specify your second modulus (really isotropic hardening defined by a table of
yield stress vs. plastic strain in ABAQUS).  In your case there will be only two points
defined in your *PLASTIC command:  the initial yield point and a second point (failure
stress, maximum plastic strain) that defines the second slope of your stress-strain curve.

Greg Cruse
Sr. Engineering Analyst
Oil States Industries

----- Original Message -----
From: Brad Probst <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, October 12, 1999 10:17 AM
Subject: Abaqus bilinear material


Would anyone have any information on how to implement a bilinear material
definition in Abaqus?

The only way I am aware of is through the use of a user-defined material
(UMAT). But, I am unsure of how to code the material definition. Could
someone who has coded something similar please offer some assistance? Or,
if there is an alternative method.

The data I am working with is the value of the Young's modulus of
elasticity corresponding to a region of strain and an additional value of
the Young's modulus for the second region of strain through failure/maximum
strain.

Thanks in advance for any feedback

Brad Probst
Dept. of Biomedical Eng.
Tulane University




%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%