Review on Model of Fatigue Crack Propagation Rate for Metallic Materials Based on Different Driving Parameters

Fatigue crack propagation rate da/dN is an important mechanical index for damage tolerance design of metallic materials, and it does not directly rely on its driving parameter, which provides probability to characterize da/dN with different driving parameters. Some models of fatigue crack propagation rate based on different driving parameters and their applications were introduced. The driving parameters include stress intensity factor range ΔK, energy release rate range ΔG, J integration range ΔJ, opening displacement range Δδ, plastic area range Δr at the crack tip and strain rangeΔε_T near the crack front. The results provide references for selection of different driving parameters on study of fatigue crack propagation.