How to define hyper elastic UMAT in a UEL?

Sai Naga Sri Harsha Ch @Sai-Naga-Sri-Harsha-Ch

08 April 2020 1 4K Report

Hi all,

I am working on Phase-Field UEL for hyperelastic materials. I am using codes of Dr Molnar ( http://www.molnar-research.com/tutorials_videos_3.html) to develop hyperelastic material. I have tried to replace the UMAT with my hyperelastic UMAT in the UEL and call the UMAT for stiffness but it's not working and resulting in negative Jacobian.

Any suggestions in implementing hyperelastic UMAT in UEL. Please let me know.

Thanks & Regards,

Sri Harsha

Peng Fan

hello, i attempt to solve this problem and it does not work, when the value of phase field approach to 0.9, the job is aborted due to mesh distortion or divergence. i even use umat to solve the displacement field.

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