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Thanks bkal. I have since solved the problem with exactly your suggestion and it worked a treat. I also used the cast iron material model to specify a different stress strain curve in tension and compression. A useful technique for the future.

PamCrash. I'm not sure how this would work. Do you have any example input decks. I've been trying to use a elastic plastic beam in parallel with a spring, without much success.

Does anyone know how to force a non-linear spring to unload down a different path i.e. to generate a hysteresis effect.