Abstract
It is recognized that crack closure behavior is the important parameter that influence the crack propagation behavior. Fatigue crack was closed under the tensile load before the tensile load was completely removed. Until now, three crack-closure modes, i.e., plasticity-induced crack closure, roughness-induced crack closure and oxide-induced were proposed. In the present study, we investigated the place where the crack-closure occurred using both the aluminum alloy A6061-T6 which exhibits the plasticity-induced crack closure behavior and the carbon steel S25C which exhibits the roughness-induced crack closure behavior.
