Fatigue - Fatigue Strength (8.2-8.5,8.8) MAE 316 Strength...

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Fatigue Strength (8.2-8.5,8.8) MAE 316 – Strength of Mechanical Components C. Heeter Tran Fatigue Strength 1
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atigue Strength Fatigue Strength ` Up to now, we have designed structures for static loads. P P w d t S ax σ y max P ( σ ax is also constant) Fatigue Strength 2 t
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atigue Strength Fatigue Strength ` What is loading is not constant? P t ` Even if σ max S y , failure could occur if enough cycles are applied. Fatigue Strength 3
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- Diagram .4) S N Diagram (8.4) S f (fatigue strength) - stress level at which a corresponding number of cycles (N) will lead to failure (crack initiation) S e (endurance limit) - stress level below which failure will never occur Fatigue Strength 4
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.8) Fluctuating Stresses (8.8) σ t σ max σ min min max ) ( 2 1 σ + = = mean m min max ) ( 2 1 = = g alternatin a his is known as “fully versed” loading max min = R ` σ min = - σ max , this is known as fully-reversed loading. Fatigue Strength 5
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Fatigue - Fatigue Strength (8.2-8.5,8.8) MAE 316 Strength...

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