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Piezoresistive Beam

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Does anyone here uses Piezoresitive module for modeling a piezoresistive beam? Or has any example which s/he can send for me?
I am really confused about the results and I need to take a look at one example.


When I model a beam with Si3N4 and P doped silicon in Electromechanical module I get reasonable value for deflection but in this module I can not measure change on current (or resistance due to deflection)
When I model the same beam in Piezoresistive module the deflection is far beyond reasonable values (like 10^8 more!!)
I have no idea what is the problem.

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