I'm seeing an odd result: Why is the stress concentrated at the corners of the supports? Surely it should be distributed across the base?
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the stress is very high at the supports, because there are local singularities (high stress gradient within an element). This is a typical phenomenon in finite element analysis. The reason for that is, that a linear finite element analysis can not consider the local plasticization, which would lead to downsizing and shifting of the stresses. Because of that a stress evaluation at the position of boundary conditions should be made in an integral way after a refinement of the mesh.
Is there a guide somewhere on how to do the refinement and re-evaluation at the singularities? I'm new to FEA, and I was not expecting this complication :-/
of course there is local plasticization in reality, but a linear finite element analysis can not consider this effect. For that you need to use a solver for nonlinear material behaviour.
Z88Aurora has one, but only for hexahedron and tetrahedron. So you have to make a new finite element structure with hexadrons or tetrahedrons to consider this effect within Z88Aurora.