Fatigue - Introduction The phenomenon of failure of a material under cyclic loading known as fatigue is estimated to be the cause of ninety percent of

Fatigue - Introduction The phenomenon of failure of a...

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Introduction: The phenomenon of failure of a material under cyclic loading known as fatigue is estimated to be the cause of ninety percent of all metal failures. Fatigue failure is caused by applied stress of a sufficient magnitude, large variation or fluctuation in applied stress, or sufficiently large number of cycles of the applied stress. An example of fatigue would be the like bending a paperclip. Its possible to bend it past its yield point without breaking, but repeated bending at the same area of the wire would cause the paper clip to fail. With that noted, the purpose of this experiment is to investigate the fatigue strength of materials, specifically their lifetimes under various geometries. Theory: Fatigue is the phenomenon of failure of a material under cyclic loading. It is a problem that effects any component or part that moves. It is estimated that ninty percent of all metal failures occur from fatigue. Cracks on materials caused by moving parts are falled fatigue cracks. These cracks are generally begin at flaws on a free surface. Once started, cracks grow at an accelerating rate.
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  • Spring '14
  • BabakMinaie
  • Stress, Stress concentration, fatigue life, ninety percent, fatigue failure

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