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The Statistical Nature of Fatigue Crack Propagation
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1979
Year
Statistical NatureEngineeringMechanicsFatigueMechanical EngineeringMicrostructureDistribution ParametersDynamic Crack PropagationSolid MechanicsMicrostructure-strength RelationshipGrowth Rate DataStatistical InvestigationCrack FormationDamage EvolutionLow-cycle FatigueMechanics Of MaterialsFracture Mechanics
A statistical investigation of the fatigue crack propagation process was conducted. Sixty‑eight replicate constant amplitude crack propagation tests were conducted on 2024‑T3 aluminum alloy. The data showed that the number of cycles to failure followed a 3‑parameter log‑normal distribution, the modified secant method produced the least error in growth‑rate calculations, no single distribution adequately described da/dN, and a prediction scheme based on da/dN distribution parameters was only partially successful.
A statistical investigation of the fatigue crack propagation process was conducted. Sixty-eight replicate constant amplitude crack propagation tests were conducted on 2024-T3 aluminum alloy. From the experimental data, the distribution of N was found to be represented best by the 3-parameter log-normal distribution. Six growth rate calculation methods were investigated and a modified secant method was found to introduce the least amount of error into the growth rate data. No one single distribution was found to describe the distribution of da/dN. A prediction scheme using the distribution parameters of da/dN was partially successful.