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Cumulative Damage in Fatigue
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1945
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Cumulative DamageReliability EngineeringEngineeringDurability PerformanceFatigue ManagementDamage MechanismFatigueMechanical EngineeringCivil EngineeringDamage EvolutionStructural Health MonitoringStressstrain AnalysisCumulative Fatigue DamageStructural MechanicsAluminum AlloyLow-cycle FatigueMechanics Of Materials
Cumulative fatigue damage is defined as the net work absorbed, with the fraction of cycles to failure representing useful life, and failure occurs when damage reaches 100 %. The study experimentally verifies the cumulative damage concept in an aluminum alloy using various specimen types, stress ratios, and loading cycle combinations. The resulting data are analyzed to relate cumulative damage to S‑N curves for different stress ratios. The analysis demonstrates that a simple, conservative cumulative damage approach can predict fatigue life in the tested alloy.
Abstract The phenomenon of cumulative damage under repeated loads was assumed to be related to the net work absorbed by a specimen. The number of loading cycles applied expressed as a percentage of the number to failure at a given stress level would be the proportion of useful life expended. When the total damage, as defined by this concept, reached 100 per cent, the fatigue specimen should fail. Experimental verification of this concept for an aluminum alloy, using different types of specimens, various stress ratios, and various combinations of loading cycles is presented. These data are also analyzed to provide information on different stress ratios when an S-N curve for any one ratio is known. Results of a sample analysis based on experiments are given. It is concluded that a simple and conservative analysis is possible using the concept of cumulative fatigue damage.