I'm doing a project about high velocity impact simulation using LS-Dyna and i got a problem about modelling the material modified johnson cook MAT107.
I have all parameters material using modified johnson cook and CL failure criterion.
I obtained the results, but the perforation was not completely, although the bullet passed the full thickness of the plate as shown in figure.
I don't know, why? Can you suggest me, are there other parameters, I must I select in ls-dyna for the material modified johnson cook?
Thanks a lot
It seems that it is problem with contact definition. First try to set up bulet as a rigid body then look deeper in contact definition.
When I used the same model , but another material, for example the material *MAT_123 MAT_MODIFIED_PIECEWISE_LINEAR_PLASTICITY_STOCHASTIC
I got a good result as shown in figure, the problem appear when I use *MAT_107 MAT_MODIFIED_JOHNSON_COOK
The contact is affected by the constitutive behavior of material, try to change in the contact definition the SOFT parameter with SOFT=2.
The contact was soft=2. Definition contact between bullet and target as shown in figure
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