Hi, could you recommend me a free or inexpensive FEA software that is using planar elements 2D with capability of nonlinear deformation and multibody contacts? I need to simulate a harmonic drive gear teeth meshing so basically the flex spline has to deform from a circular shape to an eliptic shape and the teeth have to come in contact with the outer circular spline like in this image

https://upload.wikimedia.org/wikipedia/commons/2/2c/Harmonic-drive-explanation.gif

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