does somebody how any example of hyperelastic law with fibers implemented into UMAT? What IHYPER and AOPT i should use for such analysis? I have made such UMAT for NH with polynomial density function for one family of fibers, but results are not convergent with Abaqus.
thank you for response, however i had read instructions provided in this link previously and it didn't help me to understand what is wrong.
Is there any option to see the inside how the deformation gradient or the stresses are calculated for shell elements for *mat_soft_tissue (material 91)? It would help to understand in which line of my umat procedure i am making some errors.
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