Contact model stiffness much higher than expected

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Hello,

I am simulating a contact problem between a plastic indenter and an Ecoflex sensor involving pressing down on the sensor with a prescribed displacement or (ideally) a boundary force. However, I am finding that the sensor structure is much stiffer than expected based on a curve-fit Yeoh model from practical material testing, with forces up to approximately 60 N for a <1 mm displacement on a 2 mm tall structure. I am wondering if there is an error in how I am calculating the reaction force between the indenter and the sensor, or if there is an issue with the overall model setup. I have attached a copy of the model for reference.

The Ecoflex is modeled using a 3-parameter Yeoh hyperelastic model, and the forces obtained currently are from a surface integration of the total contact force on the indenter.



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