What is the difference between thermal fatigue and creep failure?

Consider elastic and plastic strains of metals.

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  • 1.Thermal fatigue is a specific type of fatigue failure mechanism that is induced by cyclic stresses from repetitive fluctuations in the temperature of equipment. The degree of damage is affected by the magnitude and frequency of the temperature swings. Damage typically appears in the form of one or more cracks at the surface of the component. Unless remedied, cracks may propagate through the material eventually leading to failure.

    2. Creep may be defined as a time-dependent deformation at elevated temperature and constant stress. It follows, then, that a failure from such a condition is referred to as a creep failure or, occasionally, a stress rupture. The temperature at which creep begins depends on the alloy composition.
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  • Creep failure is time dependent failure.. whereas thermal fatigue is breakage of material beyond the critical temperature of which material can withstand
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