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Random variations of material properties in CAE?

Random variations of material properties in CAE?

Random variations of material properties in CAE?

(OP)
Hi

I'm using Explicit to model some geodynamic stuff, and I've reached the point where perfectly homogeneous materials are becoming a problem. What I'd like to do is have an elastic definition for, say, granite with (E=53GPa, v=0.28) and then add a small random deviation to Youngs modulus (maybe +/- 2%) for each element.
Is there a way of doing this in CAE, or any other way for that matter?

RE: Random variations of material properties in CAE?

i'd say UMAT/ VUMAT  

RE: Random variations of material properties in CAE?

(OP)
Hmmm, that's what I dreaded.
I've spent quite a while trying to understand the example for UMAT in the manual, and I'm afraid it's simply gibberish to me.

Isn't there some way of assigning materials to element sets directly? I ask because it's fairly easy to modify the input file to divide the elements into randomly selected sets. I could then assign slightly different materials to those sets.

RE: Random variations of material properties in CAE?

You can do it in Abaqus/CAE with its support for discrete fields. This was first supported in V6.7EF or so... There should be examples in the manual.

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