Fatigue in Building materials

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Fatigue is the weakening of a building material when it is loaded and unloaded repeatedly, the load being above the particular value called the fatigue strength/fatigue limit/endurance limit. Fatigue strength is defined as the load value below which the material would not yield for any number of cycles of loading and unloading.

The fun fact is the nominal stress values which cause the fatigue are mostly much smaller than the actual strength, technically known as the Ultimate tensile strength of the particular material. Fatigue results in microscopic cracks, which grow to significant size with repetitive cycles, and when they reach the critical size, the structure fractures.


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