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A question on plasticity

Recently, I have a question on the plasticity.As the plastic materials undergo the loading and unloading process. we can find the energy dissipation from the stress and strain relation curve. Then, my question is that the energy dissipation is generated during the loading process or unloading process?Thank you very much.


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I think the energy dissipation is generated during loading process, because that the unloading curver is linear.

I am not sure about my opinion. 

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