Hi everyone, first post here. I need help with meshing in Inventor Simulation!
I'm currently working on a model where I'm subjecting a vertical wire (5 micron radius, 20 micron height) to a transverse load. I made an assembly of a 18 micron length section and a 2 micron length section, so that I can apply my force to the 2 micron tip, while leaving the bottom face of the wire fixed. I am trying to find the minimal force needed to fracture the wire (i.e., altering the force until the max stress hits the material's ultimate tensile strength). However, I've realized that decreasing the mesh size drastically changes my results, Obviously, decreasing mesh size should increase the accuracy of the results. Instead, by decreasing the mesh size, I actually am diverging from my results. This makes absolutely no sense to me, can anybody help explain or give advice? I'm attaching my results below. Thanks again!
In most all cases, this is the expected behavior with any FEM package, if you're looking at the stress near a fixed constraint boundary condition. You can investigate this behavior using a simple cantilevered beam, fixed at one end and a load at the tip.
Please keep in mind that the Stress Analysis in Inventor is for linear static stress only. There are some more published info regarding this. If you're using a ductile material, then linear static stress results are only valid up to the yield stress of the material. However, if you're using a brittle material, the yield stress and ultimate tensile strength can be considered equal.