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Fatigue - Dynamic Failure Theory Chapter 7 Fatigue Failure...

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Dynamic Failure Theory Chapter 7: Fatigue Failure
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Overview Fatigue Life Methods Endurance Limit Notch Factor Fluctuating Stresses
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Fatigue Life Methods Stress-Life Method Strain-Life Method Linear-Elastic Fracture Mechanics Method
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Stress-Life Method R.R. Moore high-speed rotating beam machine
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Stress-Life Method
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Stress-Life Method Least accurate, but most traditional method Easiest to implement A lot of published data Adequately represents high cycle applications NOT good for low cycle applications
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Strain-Life Method Several idealizations made, thus uncertainty exists Most research involves axial loading No tables/charts on strain concentration
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Endurance Limit, S e Readily available data: S y , S ut , H B Results of simple, single load testing Rotating-beam test Tensile testing Relation between material properties and S e ?
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Endurance Limit, S e
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Endurance Limit, S e Can also use table A-24 Since
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