抄録
Fatigue crack propagation behavior in pure-aluminum under pull-push loading was investigated. Usually, fatigue crack propagate by mode I and fatigue crack propagation rate da⁄dN accelerate with crack growth in many metals under pull-push loading. However, results in pure-aluminum of present study showed that crack propagation mode was changed depending on testing conditions and mixed mode of crack propagation was observed. Also, even in the case of constant stress amplitude, retardation behavior of crack propagation was observed. Mixed mode crack propagation and retardation behavior of crack are discussed from the viewpoint of local crack propagation behavior, fracture surfaces'configuration and crack opening behavior.
