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getting the deformation gradient from abaqus
Sat, 2015-04-04 07:16 -kishan_Govind
Hello everyone.
I am trying to do something with the deformation gradient in UMAT. I used F=DFGRD0 as the gradient. but i found that it always comes to be a identity tensor not only for the case of a 3d isotropic elastic material but also for the ramberg osgood model. it was very surprising for me so i also tried to print DFGRD1 it was also identity tensor.
I have used a C3D8 single element and was doing the uniaxial test. Please help me out with this.
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For one element under
For one element under uniaxial, you may not have shear. You can either try your model with more elements or do a simple shear simulation.
Read the documentation.
Is that simple.