Kai Klaas wrote:
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irreversible heat. But reality looks different, of course. There is allways a certain amount of applied energy transformed into irreversible heat. So, when pressure force, which caused bending stress is removed again, membran's elongation does not return to 'zero'.
This phenomenon is called 'elastic hysteresis'. Unfortunately, elastic hysteresis is not predictable at all, because it highly depends on 'history' of bending stress and many other factors.

Hi Kai,

There are two materials which appear to exhibit very, very close to ZERO mechanical hysteresis, one is crystalline silicon, and the other isn't. Care to guess ? and its not diamond.

Steve