一种多轴向耦合随机激励下缺口试件振动疲劳寿命预测方法

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摘要提出了一种多轴向耦合随机激励下缺口结构振动疲劳寿命预测的频域分析方法。首先，实施了缺口试件的双轴向随机振动疲劳试验，研究了两个振动轴向上载荷谱之间的相干性和相位差对缺口试件疲劳损伤的影响规律；然后，通过随机振动分析计算得到试件缺口根部各节点的应力功率谱密度矩阵，并假设缺口试件裂纹萌生点为历经von Mises应力最大均方根值的节点；紧接着，缺口试件疲劳临界点可由疲劳裂纹初始点和修正临界距离理论确定；最后，在疲劳临界点处通过Carpinteri-Spagnoli频域准则计算缺口试件的振动疲劳寿命，并与试验结果进行了对比。结果表明：该多轴缺口疲劳预测方法具有较高的预测精度，绝大部分预测结果都在3倍误差带内。

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	骆政波1
	范鑫1
	刘峰1
	陈怀海2
	郑荣慧2

关键词 ：振动疲劳, 多轴向随机基础激励, 相干性, 临界距离理论, Carpinteri-Spagnoli准则

Abstract：A frequency domain analysis model for the vibration fatigue life assessment of a notched specimen under multiaxial coupled random base excitations is proposed in the present paper. Firstly, the influence of coupling relationship between the PSD functions in two vibration directions on the fatigue damage of a notched specimen are deeply studied through the implement of biaxial random vibration fatigue test. Then, the stress PSD matrix of each node at the notch root is calculated by the random vibration analysis with the finite element method, and the crack initiation point of the notched specimen is assumed as the node experiencing the maximum root mean square value of von Mises stress. Next, the fatigue critical point of the notched specimen can be determined by the modified TCD combined with the crack initiation point. Finally, the vibration fatigue life of the notch specimen is computed by the frequency domain formulation of the Carpinteri-Spagnoli criterion. The result demonstrates that the multiaxial notch vibration fatigue life assessment model can provide the fatigue life evaluation with high accuracy, and the majority of the estimated fatigue lives are within 3 time scatter band.

Key words： vibration fatigue multiaxial random base excitations coherence theory of critical distance Carpinteri-Spagnoli criterion.

收稿日期: 2022-06-06 出版日期: 2023-09-15

引用本文:

骆政波1，范鑫1，刘峰1，陈怀海2，郑荣慧2. 一种多轴向耦合随机激励下缺口试件振动疲劳寿命预测方法[J]. 振动与冲击, 2023, 42(17): 105-113.
LUO Zhengbo1, FAN Xin1, LIU Feng1, CHEN Huaihai2, ZHENG Ronghui2. A method for predicting vibration fatigue life of notched specimens under multi-axial coupled random excitation. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(17): 105-113.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I17/105

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