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Need help for running UMAT of Dr. Huang's single crystal

Soud Choudhury's picture

Hello Everyone,

I am a new member of imechanica. I have started to learn UMAT of Abaqus to model my material behavior ( Cu6Sn5, HCP) using crystal plasticity finite element model. I found Dr. Huang's single crystal UMAT to start learning UMAT and I thought that it would be a great guide to start though it is written for FCC mat. But unfortunately I was not able to run the UMAT with it's input file.

It is showing error " Too many attempts were made for this increment". I have no idea where I went wrong as I just ran the UMAT with it's own physical model. Please can anyone provide me a running UMAT of Dr. Huang ? I think there is something I need to change. Also, guideline for learning UMAT will be a great help.

 

I have used the following code and devided into .inp file and .for file.

http://www.columbia.edu/~jk2079/fem/umatcryspl_mod.inp

Also , I am using Abaqus 6-12-1. Please help me on this issue. 

Please mail me at soudchoudhury@gmail.com

 

Thank you so much. 

Comments

Frank Richter's picture

You cannot start learning UMAT with a code of this complexity.

Get the file
http://imechanica.org/files/Writing User Subroutines with ABAQUS.pdf
it may show up as
http://imechanica.org/files/Writing%20User%20Subroutines%20with%20ABAQUS.pdf

 The error message is not specific to UMAT.

------------------------------------------
Ruhr-University
Bochum
Germany

Soud Choudhury's picture

Soud Farhan Choudhury

J.Tu's picture

i also a fresher of UMAT, and i use Dr. Huang's code to learn it, but it is difficult to understand.

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