Belleville Washer Simulation using Ansys 2021 R2

We compressed the Belleville spring by 1.0mm & then release the displacement completely. Normally, before running a simulation with plasticity, we'll assume a linear material to determine if the maximum stress exceeds the yield stress. If it is such, we will then explore the plasticity pattern of the Belleville spring. More importantly, residual stress will be examined after the spring is completely released. Also, we'll plot a force - displacement curve.

Link for the geometry is provided bellow:
https://drive.google.com/drive/folders/1JCQgxuOvKWP5lhId6YF9ihPTmM_lVDU-?usp=sharing