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A New Conception on Fatigue Plasticity and Its Application to Notch Problems

机译:A New Conception on Fatigue Plasticity and Its Application to Notch Problems

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摘要

A hypothesis of fatigue plastic adaptation is proposed and modeled as one idea that is available to combine microscopic and macroscopic approaches on fatigue plasticity. The hypothesis expresses that, at the positions of a surface layer, a notch root and a fatigue crack tip, elastic deformation arising at the maximum stress is transformed into the localized inhomogeneous plastic deformation inherent in fatigue. On the basis of the hypothesis, an equivalent stress ratio is formulated as a parameter for the correspondence between the cyclic stress conditions of notched and unnotched specimens, and it is applied to some published fatigue data on the different loading types of tension-compression, torsion, bending and their combinations.

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