Non-convergence caused by material properties
I am trying to simulate the tensile testing of a non-standard geometry sample. The model has been converted to a surface, and simplified to the form shown below:
Custom material properties have been specified:
Symmetry has been applied to the width of the sample. 2 holes on the right are fixed, while the 2 on the left are given a displacement of 5x 0.28mm to the left.
The model solves fine when I use the provided materials: structural steel and aluminum alloy NL. But with the custom properties, the model diverges after 4%. I suspect this is an issue with material properties, but am not sure which property, or lack of properties is causing it.
The custom material is a unidirectional polymer sheet, hence the orthotropic properties. The properties are referenced from a research article. I have found different values for the same material from other articles involving different simulations.
Could it be that the properties I have chosen are not suitable for my model? Could the non-convergence be solved by changing pre-processing parameters?