Dear everyone, recently I have met a problem when I used the umat subroutine. When I performed a non-isothermal elastic analysis, I found that the calculation did not converge. However, when I added a "write (7,*)" statement in the programme to record what happened, it converged! I have tried many times and it always liked this. Could anybody tell me what was wrong? Have anybody met the same problem?
I've found this problem in the past and it is quite difficult to debug. Are you using the Common block by any chance?
At the time, I attributed my problem to an inconsistency on variable definition. For example, your subroutine may assume your variable is 8 rather than 16 bits, reads the first 8 bits resulting in an incorrect value. Your write statement would be forcing abacus to read the correct 16 bits.
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