The fatigue limit, also known as the fatigue strength or the endurance limit, is the maximum stress that a material can withstand before it fails due to cyclic or repeated loading. It is an important mechanical property of materials that is used to predict their behavior under cyclic or repeated loading and to design and analyze structures and components that may be subjected to such loading.
The fatigue limit of a material is typically determined through fatigue testing, which involves applying a series of cyclic loads to a specimen of the material and measuring the resulting deformation and failure. Fatigue testing is typically performed at a range of stress levels and number of cycles, and the fatigue limit is determined by extrapolating the results of the tests to the point where the material is predicted to fail after an infinite number of cycles.
The fatigue limit of a material is an important factor to consider in engineering design, as it determines the maximum stress that the material can withstand before it fails due to fatigue. It is particularly important for materials that are used in applications where they may be subjected to cyclic or repeated loading, such as construction materials, automotive components, and sporting equipment.
In mechanics of materials, the fatigue limit is often used in conjunction with other mechanical properties, such as the yield strength and the ultimate tensile strength, to predict the behavior of materials under different types of loading and to optimize their performance and reliability. It is also used to construct S-N curves, which are graphical representations of the relationship between the maximum stress and the number of cycles that a material can withstand before it fails.
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