Failure analysis in 3D
Hello,
I want to simulate a composite sandwich, with a 3d core and insert, and 2d laminate. I have selected for the 3d core MAT9ORT for material and PSOLID for the property, but none of them allowed to me to introduced a failure criteria. How could I do it?
Answers
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Failure criterion like Tsai-Wu are relevant to typical composite laminates (skins). Those failure criteria are not relevant to core materials. For core materials, typically you would recover the solid element stresses (in some HC material relevant coordinate system) and compare to some strength allowables. Those would typically come from a Hexcel (or other vendor) data sheet. Assuming X and Y are in-plane, and Z is out-of-plane, you'd look at XZ shear and YZ shear stresses. You should pay attention to the ribbon L direction and transverse W direction. Depending on your loads and design, you should probably look at Z normal stress, and compare to the compression (stabilized) allowable. They don't give you a tensile allowable because that would depend on how it's bonded to the skins. A Z normal tensile failure mode would likely be in the bond to the core or the 1st ply of the laminate, not the core itself. Depending on your manufacturing quality these might be some small numbers.
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Really useful information!!!
Thank you very much
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