Fatigue Crack Closure Under Random Loading

by Horng-Linn Perng, Univ of Arizona, United States,
Keith Ortiz, Univ of Arizona, United States,



Document Type: Proceeding Paper

Part of: Structural Safety and Reliability

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 | Stress analysis | Fatigue (material) | Stationary processes | Load factors | Synthetic materials | Rain loads

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