Depending on the magnitude of the applied stress and its duration, the deformation may become so large that a component can no longer perform its function – for example creep of a turbine blade could cause the blade to contact the casing, resulting in the failure of the blade. The rate of deformation is a function of the material's properties, exposure time, exposure temperature and the applied structural load. Creep is more severe in materials that are subjected to heat for long periods and generally increase as they near their melting point. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. In materials science, creep (sometimes called cold flow) is the tendency of a solid material to undergo slow deformation while subject to persistent mechanical stresses.
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