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

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Unformatted text preview: Dynamic Failure Theory Chapter 7: Fatigue Failure Overview • Fatigue Life Methods • Endurance Limit • Notch Factor • Fluctuating Stresses Fatigue Life Methods • Stress-Life Method • Strain-Life Method • Linear-Elastic Fracture Mechanics Method Stress-Life Method • R.R. Moore high-speed rotating beam machine Stress-Life Method 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 Strain-Life Method • Several idealizations made, thus uncertainty exists • Most research involves axial loading • No tables/charts on strain concentration 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 ? Endurance Limit, S e Endurance Limit, S e • Can also use table A-24 • Since is an estimate, need to use larger...
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Fatigue - Dynamic Failure Theory Chapter 7 Fatigue Failure...

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