*INITIAL STRESS SHELL for Plane Strain Elements

[Ameen Topa]

Hello all, 

BRIEF ABOUT THE MODEL

I am modelling a simple impact on a prestressed ceramic plate using 2D plane strain elements (ELFORM = 13 in *SECTION SHELL).

For the stress and strain initialization, I am using  *INITIAL STRESS SHELL SET and  *INITIAL STRAIN SHELL SET. 

The INITIAL STRAIN SHELL works well. The values defined (x strain and y strain) in the keyword are reflected perfectly in the first state in the d3plot. 


THE PROBLEM

However, my problem is with INITIAL STRESS SHELL. The stress values that appear in the first state of the d3plot do not match the ones defined in the keyword. This causes stress waves propagation in the model before the impactor hits the target (see the attached video).

The input file, snippets the results are attached to this email. 

Hope anyone has experience with this problem. 

Regards,
Ameen