Abstract
A mathematical model is proposed to explain qualitatively the creep acceleration of materials under cyclic loading. Under constant load, the non-uniformity of the distribution of plastic strains, which increases with loading time, introduces an internal back stress field in the material. Since the net stress in the matrix is reduced, the rate of creep is retarded with the increase of loading time. When the load is cycled, the internal stresses homogenize the distribution of the plastic strains during unloading, resulting in the partial recovery of work-hardening. The material gains a higher creep rate for the next loading. The cyclic loading under this condition accelerates the creep rate.
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