{"id":163782,"date":"2021-11-07T12:17:27","date_gmt":"2021-11-07T12:17:27","guid":{"rendered":"\/forum\/forums\/topic\/mesh-independence-study-for-non-linear-static-structural-simulation\/"},"modified":"2021-11-10T15:55:17","modified_gmt":"2021-11-10T15:55:17","slug":"mesh-independence-study-for-non-linear-static-structural-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mesh-independence-study-for-non-linear-static-structural-simulation\/","title":{"rendered":"Mesh independence Study for Non-Linear Static Structural Simulation"},"content":{"rendered":"
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Hi,<\/p>\n

I am currently running simulation regarding solder joint reliability subjected to temperature cycling. The solder joint will undergo plastic deformation and its behaviour is described by Anand's Viscoplastic model. I have set up all the pre-processing accordingly and the solver is able to run smoothly.<\/p>\n

However, when I try to conduct mesh independence study, the results only tend to converge within a certain range of number of elements. When the mesh is too coarse, the value of the result of interest is far away from convergence and when the mesh is too fine, the value of result of interest diverges as well! <\/p>\n

May I ask is this the nature of non-linear simulation? This is because I understand that for linear simulation, results tend to converge after reaching sufficiently fine mesh and remains near constant with further refinement. Does non-linear simulation applies the same concept too? What are the other issues leading to the non-convergence?<\/p>\n

Attached below is the graph of the result of interest (accumulated plastic strain- NLEPEQ) against element size of the mesh. It can be seen that the results only tend towards a certain value at a specific range of element size. Outside of that range, divergence occurs.<\/p>\n

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