I perform a non-linear quasi-static analysis in OptiStruct where an impact element penetrates and expands a composite tube. This tube consists of 3 layers. Because each layer will fail at a different laod, I want to apply a stress-strain curve. This curve should fall on a low stress level (not zero) after the element fail.
It is possible to apply a stress-strain curve for MAT1 card. In my case I have to use MAT8 card where MATX25 makes ist possible to delete Elements after they fail. But if I delete them, the modell is not be consistent anymore.
Is there a possibility to use stress-strain curves for tension and compression in each laminate direction for a composite in OptiStruct? The elements should not be deleted after they failed and must still be able to take a certain amount of tension.
Thanks for help!
Regards
Benjamin