Structural fatigue.docx - Structural fatigue(answer the...

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Structural fatigue (answer the question and recognize the classical evidence of loads, stresses, and strains, and distinguish between materials Structural Fatigue is a failure process that is caused by the effect of cycling loads. These failures in the materials normally occur at stress levels that are identified as being below the mono-tomic yield strength of the given material being utilized. Fatigue is also the most common cause of failure in metals. Fatigue in metals occurs normally under three stages which are crack nucle-ation, crack propagation, and failure. Crack nucleation is identified by the spark of the fatigue mechanism and it is associated by the effect from environmental influences. Examples of how this is developed is commonly found after the manufacturing processes. The machining can leave scratches or deep scars that are from the tools that are utilized. In the Propagation Stage the known material undergoes the level of loading that creates striations. These striations will increase in size due to the levels of stress that is applied.
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