Modeling Fatigue Crack Growth Resistance, dN/da

by Keith Ortiz, Univ of Arizona, United States,
Chieh Julius Kung, Univ of Arizona, United States,
Horng-linn Perng, Univ of Arizona, United States,

Document Type: Proceeding Paper

Part of: Probabilistic Methods in Civil Engineering


In the fracture mechanics approach to fatigue, da/dN is correlated with the cyclic range of the stress intensity factor, ΔK; the resulting relation, da/dN=f (ΔK), is commonly called the fatigue crack growth law (FCGL). Most probabilistic approaches are based on a randomization of the fatigue crack growth rate, da/dN. The authors' modeling approach is unique in treating the fatigue crack growth resistance, dN/da, as a nonstationary stochastic process evolving in space. The approach appears to be similar to models of da/dN, but is fundamentally different. The purpose of this paper is to briefly describe the approach, to present some recently obtained results, and to discuss their implications.

Subject Headings: Cracking | Fatigue (material) | Load and resistance factor design | Stochastic processes | Probability | Mathematical models | Stress analysis | Fracture mechanics

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