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Abaqus UMAT, DDSDDE calculation for hyperelastic material

priyank_upadhyaya's picture

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Hi, I am trying to implement hyperelastic constitutive model in
Abaqus using UMAT subroutine. I have gone through the theory manual (section
4.6.1) of Abaqus 6.12. I am finding it difficult to understand few steps (see attchment),
mainly related to the calculation of DDSDDE. How do we calculate variations of
different strain measures? I am looking forward to your suggestions regarding
any study material that will help me understand this.

Thanks 

Priyank

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Comments

Could you tell me which version of Fortran you install, fortran 10 or 11. thanks 

priyank_upadhyaya's picture

I am using fortran 11.1. I have it working through VUMAT and UHYPER but I just want to know how to do DDSDDE calculations.

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