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Showing results for tags 'criteria'.
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Hi everyone, I have a question about how the interlaminar stresses are calculated in shell element. I cant find it in the software documentation I have. The thin shell element model does not calculate the interlaminar stresses or shear stresses right? So there is a need to calculate it in another way, does it uses the equilibrium: xTension/dx + xyShear/dy + xzInterLamShear/dz = 0? What about in the free edge, does it assume zero there? What's the failure criteria used? Is it a quadratic considering both xz and yz InterLamShear or just linear? Sorry for so many questions but I need to justify this in my master thesis. Thank you very much, Best regards Gonçalo
I'm a relatively new user of Hypermesh v12.0 and have run into an issue when trying to use the 2D Automesh on a particular geometry. I am meshing an elliptical cylinder with interior stiffeners, i.e., frames, intercostals, etc. that are bolted together. I am modeling the vessel with 2D, first order elements and am modeling all fasteners and fastener holes. The problem that I run into is that the 2D automesher (including midsurface mesher) performs one of three operations: Failed surface mesh Meshes only around the holes (this is when I specify washers in the parameter/criteria files) Meshes over holes/cutouts that are below a certain diameter I've reworked and modified all parameters and criteria that I feel are relevant and even those that I feel are irrelevant. Further, when I perform topological cleanup and have the preprocessor locate and tag holes, it tags all holes except for those above a certain diameter (so Hypermesh is treating the larger and smaller cutouts differently). No matter what, I cannot mesh this structure and the direction that I feel I am taking now is non-intuitive and quite frankly arbitrary. Any guidance would be appreciated.