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Thank you for your reply, would someone be able to point me in the direction of the literature for STKO's formulation of the zeroLengthContactASDimplex element?

Hi, I was just wondering if anyone could explain to me the mechanics behind the simple springs used in zeroLengthContactASDimplex. I am assuming there are two springs in parallel in the normal and in the tangential directions. Is this correct?
Are the springs fully elastics or are there any sliders ...