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Material strain-rate softening behavior, Convergence Problem.

Material strain-rate softening behavior, Convergence Problem.

Material strain-rate softening behavior, Convergence Problem.

(OP)
Hi
I get This warning:

Quote (Abaqus-Warning)

Material "X" has strain-rate softening behavior. This material may become unstable and cause convergence problems. We recommend that the rate dependent data be modified such that the yield stress increases with increasing strain rate
I can't Extract whole data, but you can see part of it in blew images:


Now, How should i arrange this data to remove this warning?
with Best Regards.
yassou.

RE: Material strain-rate softening behavior, Convergence Problem.

you get that warning when the slope of the stress-strain curve is not positive.

You can see for your rate 10 values, the stress drops from 876 to 801 MPa as plastic strain increases from 0.02 to 0.03.

RE: Material strain-rate softening behavior, Convergence Problem.

(OP)
Indeed Dave442.
It's funny i placed the Image of problem and i didn't recognize row 54 is 901000000 not 801000000.
Thanks again.

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