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Multiaxial fatigue behavior and life prediction of 7075-T651 aluminum alloy under two-step loading
Engineering Fracture Mechanics ( IF 5.4 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.engfracmech.2020.107007
Yajun Chen , Pengda Xu , Chenchen Liu , Fusheng Wang , Haipeng Song

Abstract Focusing on the loading sequential effects on the multiaxial fatigue damage accumulation, tests including two series of constant amplitude loadings and 12 groups of two-step loading spectra were conducted on 7075-T651 aluminum alloy. Under the same equivalent stress amplitude, the multiaxial fatigue life raises with the increase of stress amplitude ratio. Fatigue damage accumulation rate is decreased by the two-step loading interaction. Cyclic loading curves and fracture morphology analysis reveal that the loading step corresponding to lower fatigue life is dominant. Considering the stress amplitude ratio effects and loading interaction, a non-linear accumulative damage model is proposed based on the modified Basquin’s criterion. The proposed model provides a more accurate calculation of accumulative fatigue damage compared with the other four commonly used models. Fine life prediction results are obtained by the proposed model with all predicted data within a factor of three.

中文翻译:

两步加载下7075-T651铝合金多轴疲劳行为及寿命预测

摘要 针对加载序列对多轴疲劳损伤累积的影响,对7075-T651铝合金进行了2组等幅加载和12组两步加载谱试验。在相同的等效应力幅下,多轴疲劳寿命随着应力幅比的增加而提高。两步加载相互作用降低了疲劳损伤累积率。循环加载曲线和断口形貌分析表明,对应于较低疲劳寿命的加载步骤占主导地位。考虑应力幅比效应和载荷相互作用,基于修正的Basquin准则提出了非线性累积损伤模型。与其他四种常用模型相比,所提出的模型提供了更准确的累积疲劳损伤计算。所提出的模型获得了精细寿命预测结果,所有预测数据均在三倍以内。
更新日期:2020-05-01
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