Variable Resistance for Deforming body

Muhammad Shumail Malik

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Hello everyone,

I am Malik, currently working on a simulation project involving measurement of resistance changes in a strain sensor. My objective is to monitor how the sensor's resistance varies with applied mechanical strain. However, during my simulation, the resistance value remains constant and does not reflect the expected variations with strain.

To briefly explain my approach, I'm using a conductive silver path on a PDMS surface. I have encountered specific challenges and would appreciate any guidance you can provide:

Initially, I used two physics interfaces: Solid Mechanics and Electric Currents. However, when attempting to couple these two physics interfaces, I didn't find the required Electromechanics option in the Multiphysics coupling node. Instead, the software suggested using Piezoelectric Effect, which doesn't align with my current research scenario.

Alternatively, I introduced the Moving Mesh interface to couple mechanical deformation with electrical properties. Unfortunately, whenever I select boundaries in the Moving Mesh, they become unavailable for selection in the Solid Mechanics interface, and vice versa. This issue prevents effective coupling between these two physics interfaces.

I kindly request your expert advice or suggestions regarding the best approach to accurately measure changing resistance in response to mechanical strain on a stretchable PDMS surface. If anyone has personal experience with a similar project or can recommend relevant examples from COMSOL's Application Gallery or elsewhere, it would be extremely helpful.

Thank you very much for your support and valuable suggestions!

Best regards, Malik


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