一种修正的基于临界平面多轴循环计数法

摘要/Abstract

摘要：

摘要：进行多轴随机载荷下的结构疲劳寿命分析时，需选择合适的循环计数方法提取损伤事件.结合疲劳寿命预测方法中的临界平面法，对Langlais多轴循环计数法进行了讨论，并在此基础上完成了对Langlais多轴循环计数法的修正.修正后的多轴循环计数法可以精确地考虑到1个主通道循环内辅助通道的全部载荷信息；同时发展了修正Langlais法新的实现方法，可以用于封闭曲面法计算有效载荷；对三点雨流计数法的循环计数起始点选择进行了改进，提高了循环计数效率.

关键词: 多轴疲劳, 临界平面法, Langlais法, 雨流计数法, 循环计数

Abstract:

Abstract： A proper cycle counting method should be selected when predicting the fatigue life of engineering components under variableamplitude and multiaxial random loading. Based on the critical plane method, the Langlais multiaxial rainflow counting algorithm was discussed. Then, a modified Langlais multiaxial rainflow algorithm was proposed and a realization method for modified Langlais multiaxial rainflow algorithm was developed. The modified Langlais multiaxial rainflow algorithm can accurately take into account all load information in the auxiliary channel, corresponding to a complete cycle in the counting channel. And it can be used for the enclosing surface method to calculate the effective stress or strain range. For a new cycle counting process of the 3point rainflow method, the method of choosing the starting point was modified, which improved the efficiency of cycle counting.

Key words: multiaxial fatigue, critical plane method, Langlais method, rainflow counting method, cycle counting

中图分类号:

O 346.2

李艳开，滕金芳，余文胜. 一种修正的基于临界平面多轴循环计数法[J]. 上海交通大学学报（自然版）, 2014, 48(12): 1772-1776.

LI Yankai，TENG Jinfang，YU Wensheng. A Modified Multiaxial Cycle Counting Based on Critical Plane Methods[J]. Journal of Shanghai Jiaotong University, 2014, 48(12): 1772-1776.

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