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Perfect elasto-plastic material model

August 12, 2018 by Cyprien Leave a Comment

This is probably the simplest of all nonlinear material models. It considers that once the yield stress is reached, stress becomes constant and only strain continue to increase.

That’s a very big assumption and probably only valid for steel materials near the yield stress (in reality stress continue to increase a bit until the ultimate stress limit is reached)

It’s a very easy model to set-up (you only need the yield stress value…), but don’t overuse this model just because this is the only one you can easily setup as you don’t have the required stress-strain data… you would just get wrong results.

Read this article for more details about nonlinear material models:

http://feaforall.com/nonlinear-material-model-fea/

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