About feap

[xuehanbing]

Dear all:
        I have writen a umat,I find a question after debug it simply,the question is that when I embed it into feap and run,the feap terminate suddenly after feap run about three or four seconds.for the situation ,I want to know whether the problem lies in my umat or input file .the attachment is my input file.Dose my input file have a error in format.Expect everyone's reply.Thank you.
         Best wishes.
        xuehanbing

[Prof. S. Govindjee]

Some debugging hints:

1. Always look at the output files for errors.

2. Always start by running your problem interactively.  Check the mesh in the graphics window.  Run CHECk to check the node numbering.

3.  Try running problems first with built-in FEAP models/elements.  Begin simple move your way up.

4.  Then and then only, start adding in your own elements and materials.  Go step by step.  Do not start with a complex problem with thousands of time steps.