This error is often a result of some parameter's not being defined correctly or as a result of some part of the subroutine tending to infinity, possibly due to division by zero.

I would recommend checking none of your parameters are tending to zero, if they are used for division especially.

I've come across this error a number of times and it is nearly always a parameter that has been given an incorrect value or is not well defined.

Best of luck.

Hello Mr. Murchu

Many thanks for your comment. You are completely right. I have defined one state variable in my code but I forgot to change the number of state varibles in Abaqus interface from zero to one. That was one of main problem. However, I ain't been able to overcome this error yet. I think there is something wrong in the body of the code as you mentioned.

Many thanks.

Have you done what the error suggests? Check the .dat .msg and .sta files? Do they give any information on why it has aborted?

I already check .msg file but I couldn't find anything regarding the error. It just contains the information about the model, number of element, step and so on. Do you know where the error msg is exactly written?

If you are making incremental changes to the subroutine, I would recommend reverting to the last working version and comparing it with your current non-operational version.

Failing this, re-writing the code into a fresh .for file can help you troubleshoot error with this type of work.

Hi, I am confused about the unit of τ and γ in the attachment file. Could you help me? I have done the inter-ply slipping test and obtained the tangential force-displacement curves at different process parameters. I don't know whether the force should be converted to stress by dividing the area when solving DDTDDG. Is the relative sliding motion γ the displacement in my force-displacement?