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Stress values different for VUMAT and Abaqus built-in material 1

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JayEngSci

JayEngSci

Mechanical
Joined
Jun 24, 2016
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Hi! I'm running simulations of composite laminates under impact loading.
An example of VUMAT is uniFiber.f. At the first step, I only conduct linear elastic analysis without any damage. The element used is C3D8R.
I compared the results by VUMAT and also Abaqus built-in material model.
I found there is a difference in stress values, for example, S11=4.36GPa for VUMAT while 5.4GPa for buil-in material model.
Does anyone know the reason?
 
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