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Both Fatigue and Creep are causes of failure of a material at a stress value significantly below the Allowable threshold. They differ from each other in the sense that fatigue is defined as the failure of a material, subjected to multiple loading and unloading cycles, even though, in none of the instances, the applied stress crosses the Allowable stress value. The fatigue life of a material is usually specified in # of loading/unloading cycles it can undergo, without failing. The fatigue life decreases as the applied stress approaches the Allowable Stress. CREEP, on the other hand, is time related failure of a material. Creep, explains that a material subjected to a certain applied stress will continue to deform at that constant stress value. Hence, creep results in an increase in strain value while the stress is constant, until it causes the failure of the subject material. CREEP tends to increase with the temperature of the specimen

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6mo ago

Fatigue is the weakening of a material caused by repeated loading and unloading, leading to eventual failure, while creep is the deformation of a material under constant load over time, often at elevated temperatures. Fatigue occurs due to cyclic loading, whereas creep occurs due to constant loading.

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Q: What is the different between fatigue and creep?
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