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Fatigue failure, ringing ears tinnitus - Test Out

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The S-N curve• A very useful way to visualize time to failure for a specific material is with the S-N curve.
Even if you design mechanical components satisfying mechanical strength criteria it may fail due to a phenomenon called fatigue.
The nominal maximum stress values are less than the ultimate tensile stress limit, and may be below the yield stress limit of the material.• Fatigue occurs when a material is subjected to repeated loading and unloading. Historically many design disasters have happened by neglecting effect of Fatigue.In this video lecture we will learn how to predict and quantify fatigue effect.

This crack will begin to grow with fluctuating load and over time it will cause an abrupt failure. 2 is the fatigue limit.• The significance of the fatigue limit is that if the material is loaded below this stress, then it will not fail, regardless of the number of times it is loaded. The shape of the structure will significantly affect the fatigue life; square holes or sharp corners will lead to elevated local stresses where fatigue cracks can initiate.
Material such as aluminum, copper and magnesium do not show a fatigue limit, therefor they will fail at any stress and number of cycles.

Round holes and smooth transitions or fillets are therefore important to increase the fatigue strength of the structure. The number of cycles required for a material to fail at a certain stress in fatigue life.

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