Abaqus aborting with increasing steps 1

[dweeb]

Hi,

I am running a simple 3-D (c3d8 elements) linear static stress analysis with a user defined material; the solver runs fine with up to seven steps in the input file. If I add an eighth step to the input file (concentrated load), the solver does not even make it past the first step and crashes after about 8 iterations (not steps). The only error message is abaqus aborted with error code 6, nothing else in the .log .msg .dat files. Does not seem to be a problem with memory or scratch file space, but I'm not positive. I've tried reducing/redistributing the load, using stabilize and other options, increasing the number of iterations, but I always get the same result. Any suggestions? Thanks in advance for your help.

 

[xerf]

You said you are using "user defined material" i.e. you're using UMAT subroutine, right?

Are using automatic incrementation ? You can try use
fixed time increments having smaller values.

 

[dweeb]

Yes, I'm using UMAT with an automatic increment. I'll try a smaller increment and see if that works. Thanks very much for the suggestion.

 

[corus]

Adding an additional step won't stop the previous steps from solving. I'd check the .msg file to see if you are getting the same output as the original 1st step as you may have inadvertently changed your input. It happens. It does look like a problem with space though. Space, the final frontier, as someone once said.

corus