Residual stress refers to the internal stresses that remain in a material even after the original cause of the stresses has been removed. These stresses can arise during manufacturing processes, such as welding, casting, machining, or upon solidification of a material. They can also develop over time due to various factors, including phase transformations, thermal cycles, and mechanical loading. Residual stresses can significantly affect the performance of materials and components, influencing their mechanical properties such as fatigue resistance, fracture toughness, and dimensional stability.
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