sivaprasad.avs's blog

Can someone answer me if Gurson-Tvergaard-Needleman void growth model is not suitable for flyer-plate impact simulations? I have come across some papers who have derived void growth equations to simulate fracture in ductile mateials like OFHC copper etc., subject to plate impact (uniaxial strain high strian rate loading). I have attached 3 of them. But none of them have used Gurson's yield function. I did not find any explanation if GTN model has any drawbacks in simulating spallation phenomena found in plate impact simulations.

I am using Smoothed Particle Hydrodynamics (SPH) with dual particle
approach (please look at the figures in the .ppt file I have attached) to simulate High
Velocity impact phenomena.

The shape function values being 1 at the corner particle and zero at the other particles makes the Jacobian to evaluate the gradients of shape function inconvenient (the jacobian becomes a zero matrix). 

The slides explain my problem more clearly.

Kindly go through them and help me.