Pratik Ganorkar

Hi Andreas, 

Thank you very much for the  response. I have learnt a lot from your advice.

The material erosion criteria I have been using is by UMAT. But it starts to give negative volume error, after adding CONTACT_EROSION_SURFACE_TO_SURFACE for all contact surface and taking high principle stress values in MAT_EROSION the entire plate gets deleted. What is the contact which I need to use to solve the problem. 

The following image is of the elements gets deleted.

4 layer composite plate impacted by FSP  

Thanking you

Pratik Ganorkar (

MTech Mechanical Engineering 

Indian Institute of Technology Goa (2021-2023)