Hi. I am doing simulation of compression testing of a spring.My experimental and simulation results are same in the linear region. I have tried the simulation with all types of contact behavior even with pin ball at different radius with linear and non linear material properties with large deflection on/off. The graph is different when all helix are in contact with each other.The following graph shows my results. I will be grateful if anyone can suggest any solution to simulate the encircled curve in ANSYS.

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