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Examination of the effect of stresses beyond the endurance limit on the life of D16T alloy in programmed loading
Summary
This study analyzed fatigue life of D16T aluminum alloy under programmed loading with stresses beyond the endurance limit, finding that sub-endurance-limit stresses increase scatter in fatigue life due to localization of microplastic strains. The results refine cumulative damage summation methods for predicting fatigue life under complex loading spectra. Note: this paper concerns materials engineering, not environmental microplastic pollution.
1. The mean value of the logarithm of the fatigue life of the D16T alloy specimens tested by block loading with a single overload (higher than the endurance limit) stress level can be determined by the summation of the logarithm of the lives at the overload level obtained from the fatigue curve in the σα vs log N or log (σα−σ′−1) vs log N coordinates. 2. On the basis of the statistical analysis of the results, it is assumed that the presence, in the programmed loading block, of stresses lower than the endurance limit results in a greater scatter of the logarithms of the fatigue lives in comparison with that determined from the fatigue curve in the σα vs log N or log (σα−σ′−1) vs log N coordinates. This phenomenon may be caused by the special features of localization of the microplastic strains under the effect of stresses lower than the endurance limit.