Hi,
Do I know the non-linear input can be used to represent the shock cell behavior for collapse analysis.
Any example or suggestion for this card.
You can use the Non-Linear Spring Input, but I would recommend taking a look at the Non-Linear Joint-to-Joint Spring input so that you can connect the shock cell to your structure instead of as a boundary condition.
I've created an example of how to use non-linear joint-to-joint springs here:
https://communities.bentley.com/products/offshore/w/wiki/39309/model-gap-elements-with-psi-using-collapse
You will just need to get the force-deflection curves from the manufacturer and enter them in the collapse input file.
Regards,
Geoff