Threshold stress intensity factor range of a mechanically-long and microstructually-short crack perpendicular to an interface with plastic mismatch.

In this study, we investigated long fatigue crack growth perpendicular to a soft-hard material interface comprising the same Young’s moduli but different yield strengths. We determined the degree of fatigue crack growth retardation attributable to the interface under the constant stress intensity factor range (Δ K ) using the plasticity-induced crack closure analysis with the Dugdale model. We subsequently determined the threshold stress intensity factor range (Δ K th ) under a constant stress amplitude (σ a ). Under a constant Δ K , the retardation degree was primary dependent on the two materials’ yield strength ratio. Under a constant σ a , Δ K th was dependent on both the yield strength ratio and the distance between initial crack tip and interface. [ABSTRACT FROM AUTHOR]