UMAT in 3D

Clearly defined bug reports and their fixes
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kevinarden
Posts: 2237
Joined: 25 Jan 2019, 01:28
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UMAT in 3D

Post by kevinarden »

There seems to be a bug or a limitation in the code. Applied forces, both body and boundary forces are ignored in 3D when using UMAT. You can use enforced displacements and get results.
Applied forces, both body and boundary, do work in 2D.
I realized that all of my past case and development had been in 2D.
All of the Elmer test case have been in 2D.

Attached is a simple case to demonstrate, that applied forces are ignored when using UMAT with 3D.
box.zip
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mika
Posts: 230
Joined: 15 Sep 2009, 07:44

Re: UMAT in 3D

Post by mika »

The sif has

Nonlinear System Convergence Tolerance = 1000

and therefore the nonlinear iteration loop is terminated without solving linear systems. I gave much smaller value and got results also for given external loads.

-- Mika
kevinarden
Posts: 2237
Joined: 25 Jan 2019, 01:28
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Re: UMAT in 3D

Post by kevinarden »

You are correct sir. Thanks again.
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