hyperelatic material

[fiorenza]

Hi,
i´m working with an hyperelastic material.I´m simulating a tensile test at 70 degrees, using the marlow model and fitting the data from the unixial test done in the laboratory.
I got always the same error:THE COMPRESSIBLE BEHAVIOUR NEEDS AT LEAST ONE NON VANOSHING DERIVATIVE WITH RESPECT TO J.
WHAT does it mean?How can i fix?
thanks.
Fiorenza

 

[tom1953]

I have no idea what that error message means, but I think the first place you should look for an answer is with the manufacturer of the test machine, as they programmed that error message to appear when something specific happened in the testing.

Tom Jablonowski, TSE Industries, Inc.

http://www.tse-industries.com