{"id":245242,"date":"2022-12-31T13:45:23","date_gmt":"2022-12-31T13:45:23","guid":{"rendered":"\/forum\/forums\/topic\/verification-of-results-from-explicit-dynamics\/"},"modified":"2022-12-31T13:45:23","modified_gmt":"2022-12-31T13:45:23","slug":"verification-of-results-from-explicit-dynamics","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/verification-of-results-from-explicit-dynamics\/","title":{"rendered":"Verification of results from Explicit dynamics"},"content":{"rendered":"

I’m new to explicit Dynamics. I’m currently doing a simulation of a mechanical brake system for a robotic joint for my project. I’m having a hard time obtaining a consistant result. After every mesh refinement, the impact stress keeps on increasing.<\/p>\n

<\/p>\n

The spoked body hits the pin (fixed on one side) with high angular velocity. I’ve taken the spoked entity as a rigid body. Initially I thought I could verify the results analytically, equating rotational kinetic energy (0.5*I*W^2) with impact energy (0.5*F*deflection) and thereby obtaining obtaining value of impact force (assumed the deflection to be that of a cantilever beam FL^3\/3EI). Later finding the value of bending stress and comparing it with the numerical value. Is it the right way to do it ?<\/p>\n

Mesh sizes and Bending stress at pin<\/div>\n
—————————————————-<\/div>\n
0.8mm >> 337.16 MPa<\/div>\n
0.6mm >> 351.88 MPa<\/div>\n
0.4mm >> 385.87 MPa<\/div>\n
0.2mm >> 512.67 MPa<\/div>\n
 <\/div>\n
These were the bending stresses that I’ve got from the post processor. The bending stress I got analytically was 413 MPa using the aforementioned method. I assumed that the stress’d converge at  that point after mesh refinement. Can anyone tell me what I’m doing wrong here ? I’ve also attached the energy summary<\/div>\n
 <\/div>\n
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