I am a new user of Abaqus and its libaray UMAT. Since I need to perform some CPFEM simulations, I used Huangs’s UMAT code. I tried to execute the example input file and to replicate the copper case study reported in: “A USER-MATERIAL SUBROUTINE INCORPORATING SINGLE CRYSTAL PLASTICITY IN THE ABAQUS FINITE ELEMENT PROGRAM“. The simulation exits with an error when using the example input file due to numerical singularities and when I create my own input file I’m not able to obtain plastic strain and I only have elastic response for any displacement and pressure value. Something is wrong but I can not figure it out.
Has someone encountered this problem?
Does anyone have any idea what the problem might be?
Thanks in advance for your help.
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Best Answer


I think your code might have some errors, and you need to recheck it. I can recommend you some packages that will help you in modeling the plasticity of isotropic materials and composite materials with the UMAT subroutine:

UMAT Subroutine (VUMAT Subroutine) introduction

Advanced UMAT Subroutine (VUMAT Subroutine) 

Also, if you need any example files, visit this website; you just need to search your keywords:

Best wishes.

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