Why does stress-relaxation occur during the dwell period during dwell-fatigue crack propagation tests?

Lazuardi Pujilaksono @Lazuardi-Pujilaksono-2

16 September 2019 0 128 Report

Could anybody please explain why stress relaxation occurs at the crack tip during dwell-fatigue crack propagation?

During the dwell period, stress is kept constant (which should lead to a creep mechanism) but why does stress relaxation occur at the crack tip during the same period?

Thank you.

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