I am trying to examine the stress distribution in a SiO2 film coated on a thick Si sample with a small Al bump on it, all heated to 700 K. I thought I built the model correctly, but the resulting stress distribution diagram is quite different from what I expected. Specifically, the stress gradient is not existent at the boundary of Al and other metals. Can anyone tell me what may be the problem with my model? Especially concerning the boundary conditions? Thanks.
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