
Caused by repeated cyclic loading and unloading, even if the stress is below the material's yield strength.
A time-dependent propagation that occurs at high temperatures or under long-term sustained loads, common in polymers and high-heat metals. Crack Growth
Fragilization of the crack tip caused by the presence of hydrogen atoms. The Three Stages of Fatigue Crack Growth Caused by repeated cyclic loading and unloading, even