多轴随机载荷下基于临界平面的疲劳寿命模型

IF 3.5 Q1 ENGINEERING, MULTIDISCIPLINARY
Jie Wang, Jianhui Liu, Feilong Hua, Yingbao He, Xuexue Wang
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引用次数: 4

摘要

工程构件/结构通常承受复杂多变的载荷,导致随机多轴应力/应变状态。然而,恒载荷下的疲劳分析方法不能直接应用于随机载荷下的疲劳寿命预测分析。因此,如何有效地评估多轴随机载荷下的疲劳寿命是本研究的目的。设计/方法/方法首先,将平均相位差表征为剪切应变循环数与正常应变循环数之比,并提出了新的非比例附加硬化因子。然后,将确定的随机典型载荷谱处理成简单的变幅载荷谱,并根据多轴疲劳寿命预测模型和Miner理论计算各平面的损伤;同时,利用投影法对累积损伤进行单独计算。最后,将最大投影累积损伤面定义为多轴随机疲劳临界面。结果基于TC4钛合金随机多轴载荷试验数据,验证了该方法的疲劳寿命预测能力。大多数预测结果在双散射带内。本研究旨在为多轴随机载荷下临界平面和非比例附加硬化系数的确定提供参考,推动多轴疲劳研究从实验研究向实际工程应用发展。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Critical plane-based fatigue life model under multiaxial random loading
PurposeEngineering components/structures are usually subjected to complex and variable loads, which result in random multiaxial stress/strain states. However, fatigue analysis methods under constant loads cannot be directly applied to fatigue life prediction analysis under random loads. Therefore, the purpose of this study is how to effectively evaluate fatigue life under multiaxial random loading.Design/methodology/approachFirst, the average phase difference is characterized as the ratio of the number of shear strain cycles to the number of normal strain cycles, and the new non-proportional additional hardening factor is proposed. Then, the determined random typical load spectrum is processed into a simple variable amplitude load spectrum, and the damage in each plane is calculated according to the multiaxial fatigue life prediction model and Miner theory. Meanwhile, the cumulative damage can be calculated separately by projection method. Finally, the maximum projected cumulative damage plane is defined as the critical plane of multiaxial random fatigue.FindingsThe fatigue life prediction capability of the method is verified based on test data of TC4 titanium alloy under random multiaxial loading. Most of the predicting results are within double scatter bands.Originality/valueThe objective of this study is to provide a reference for the determination of critical plane and non-proportional additional hardening factor under multiaxial random loading, and to promote the development of multiaxial fatigue from experimental studies to practical engineering applications.
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来源期刊
International Journal of Structural Integrity
International Journal of Structural Integrity ENGINEERING, MULTIDISCIPLINARY-
CiteScore
5.40
自引率
14.80%
发文量
42
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