Algorithms for multiaxial cycle counting method and fatigue life prediction based on the weight function critical plane under random loading

Algorithms for multiaxial cycle counting method and fatigue life prediction based on the weight function critical plane under random loading
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随机载荷下基于权函数临界面的多轴循环计数法及疲劳寿命预测算法

DOI:
10.1177/1056789519831051
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发表时间:
2019-02
影响因子:
4.2
通讯作者:
Liu Xiao Dong
Liu Xiao Dong
中科院分区:
工程技术2区
文献类型:
--
作者:
Wang Xiao Wei;Shang De Guang;Sun Yu Juan;Liu Xiao Dong

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在权函数法确定临界平面的基础上,对雨流循环计数法和射程循环计数法进行了改进,提出了两种多轴循环计数算法。这两种算法都可以应用于多轴随机加载,并适用于任何基于关键平面的疲劳寿命预测模型,因为计数的循环或反转用开始时间和结束时间来表示。利用7075-T651铝合金、En15R钢和7050-T7451铝合金在多轴随机载荷作用下的高周和低周疲劳试验数据,对所提出的两种算法进行了多轴疲劳寿命预测。寿命预测结果与实验数据吻合较好。
Based on the critical plane determined by the weight function method, two algorithms for multiaxial cycle counting method are proposed by modifying the rainflow and range cycle counting methods. The proposed two algorithms can be applied to multiaxial random loading, and be suitable to any critical plane-based fatigue life prediction models, since the counted cycles or reversals are represented by the start time and end time. The proposed two algorithms are used to predict multiaxial fatigue life by the experimental data of 7075-T651 aluminum alloy, En15R steel and 7050-T7451 aluminum alloy conducted under multiaxial random loading in both high-cycle and low-cycle fatigue region. The life prediction results are in good agreement with the experimental data.
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