And plastic deformation can’t be reversed, its a one-shot deal, when its bent its bent. Loses integrity as well when its deformed.

I had to study properties of metal for an engineering class. There was no elastic deformation that I remember, unless you pass the materials elastic limit. Important concepts to be clear about. You don’t want something plastic if you need elastic.

Its not deforming at all though. Its compressing and decompressing, like a spring. Plastic is plastic, elastic is elastic. You can’t say “this plastic is elastic”, its a different property altogether.

Except, what they’re describing seems to be elastic, not plastic. Plastic deformation is permenant.