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I'm trying to model a capacitive force sensor with a bilayer configuration of polymer - Si on Mechanical APDL 16.2 .

I have a 0.2 mm layer of Si deposited on 0.005 mm of polyimide polymer. My goal is to find out the the length change in polyimide for an exerted force of 3 mN. For that purpose, I plot the displacement curve along x direction (origin to the edge). However, I obtain a nonlinear result.

I can't understand the origin of this nonlinearity. In my opinion, the polymer has to obey Hooke's law. What could be its reason?

Here is the model code.

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  • $\begingroup$ gist.github.com is a better place for anonymous sharing of code snippets. $\endgroup$ – peterh Feb 13 '17 at 17:33

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