Fatigue Crack Closure Under Random Loadingby Horng-Linn Perng, Univ of Arizona, United States,
Keith Ortiz, Univ of Arizona, United States,
Abstract: The goals of the research are to determine fatigue crack growth rates for stationary random amplitude loadings with arbitrary mean stress. Fatigue crack closure theory is applied to justify an equivalent constant amplitude R-ratio and stress range approach. The definition of the equivalent R-ratio is based on consideration of the shape of the plastic wake formed by the crack. The equivalent stress range is determined by two methods: local stress range pair counting and rainflow cycle counting.
Subject Headings: Cracking | Fatigue (material) | Load factors | Plastics | Arbitration | Terminology and definition | Rainfall
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