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I can't agree with Mustaine3, of course you need true stress strain curve like in picture, but you have to know tangent modulus of this material and subtract elastic deformation region. Then you can define this curve in material model.

1) If you decide to use bonded contact between spring coils, then after you compress the spring it's can't go back to beginning state (coils just "stuck" together). 2) Yes 3) Lagrangian and Penalty method it's very width topic, generally penalty method is always use in symmetric or self contact...

Hi Student BE, For sure you shouldn't define bonded or tie contact definition between parts which move between each other. You can use friction or frictionless contact (it depends on your simulation). Algorithm check it in all iteration if parts are in contact then contact will be work (Let say...