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Strength of Materials: Fatigue Stress

Up to this point static failure has been the main point of discussion. However, it is possible for a part to fail at lower load then what was originally expected when that load is applied to the specimen in a cyclical manner. This is known as fatigue failure. Typically it takes thousands to millions of cycles before fatigue failure occurs. However, you can experience a fatigue failure by bending a paper clip back and forth. Of course this happens a lot faster than most fatigue failures, and that is because you are permanently deforming the paper clip after each bend which you wouldn't want to happen in a real application.

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