I am simulating a FMJ bullet impact on a helmet, which uses MAT162 model for simulating its damage.
when i tried for a coarse mesh(nearly 5mm element size) the bullet does not penetrated the helmet layers.
but when i tried a finer mesh (nearly 1mm element size) the bullet penetrated all the helmet layers.
What can be the possible cause, please help.
My comments are guesses, based on the assumption that you are designing a better helmet, and not a better full metal jacket bullet. And also assuming that the only varying parameter is the mesh, the extreme sensitivity to mesh variation suggests that the design has other sensitivities as well. The location of the impact point on the element (central, off center, corner, edge) and the inter-element distances affect strains and stress flows. I suspect that the finer mesh is providing a simulation closer to reality. An even finer mesh may show even more effective penetration. This of course is speculation. A “simulation” is what we do when we do not “know”. A functional hardware test will bring you closer to “knowing”.
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