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Shrink fit, URGENT question, why are the forces too small?

Question asked by Majd Al Mohtar on Nov 30, 2017

I am demonstrating 2 lego blocks mounting on top of each other by making the pin of one block slightly larger than the cavity of the other, and adding a contact set between each pin and cavity, and running a shrink fit analysis to find the force needed to be exerted on a block to mate it to the other. I am getting very small forces as a result, and I am not knowing what my error could be. Logically, mounting two lego blocks together needs more than a force in the order of 10^-14 N. Can you help me with my problem? Regards!