基于样本集聚原理的疲劳可靠性评估方法及其在零部件上的应用

doi:10.3901/JME.2016.06.206

机械工程学报 ›› 2016, Vol. 52 ›› Issue (6): 206-210.doi: 10.3901/JME.2016.06.206

• 交叉与前沿 • 上一篇

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基于样本集聚原理的疲劳可靠性评估方法及其在零部件上的应用

白鑫^{1, 2}, 谢里阳^{1, 2}, 钱文学^{1, 2}

1. 东北大学现代设计与分析研究所沈阳 110819;
2. 东北大学航空动力学装备振动及控制教育部重点实验室沈阳 110819

出版日期:2016-03-15 发布日期:2016-03-15
作者简介:白鑫,男,1988年出生,博士研究生。主要研究方向为机械装备疲劳断裂与可靠性。E-mail：neu.baixin@gmail.com ;谢里阳(通信作者),男,1962年出生,博士,教授,博士研究生导师。主要研究方向为大型机械装备疲劳强度与可靠性。E-mail：lyxie@me.neu.edu.cn;钱文学,男,1975年出生,博士,副教授,硕士研究生导师。主要研究方向为结构系统可靠性和疲劳强度。E-mail：wxqian@mail.neu.edu.cn
基金资助:
国家自然科学基金(51335003)和辽宁重大装备制造协同创新中心资助项目

Fatigue Probability Evaluation Method Based on the Principle of Sample-polymerization

BAI Xin^{1, 2}, XIE Liyang^{1, 2}, QIAN Wenxue^{1, 2}

1. Institute of Modern Design and Analysis, Northeastern University, Shenyang 110819;
2. Key Laboratory of Vibration and Control of Aero-propulsion Systems, Northeastern University, Shenyang 110819

Online:2016-03-15 Published:2016-03-15

摘要/Abstract

摘要： 针对随机载荷下的疲劳可靠性,为能实现用小样本量的或大分散性的寿命数据获得较精确的寿命评估结果,基于样本集聚原理,改进应力-寿命关系曲线的获得方法,介绍逐渐缩小区间搜索方法和考虑材料分散性和随机载荷下的疲劳可靠性模型。逐渐缩小区间搜索方法的核心思想是区间逼近,每次搜索循环后均会缩减最优值的范围,至满足设定容差的结果停止搜索,并拟合应力-寿命关系曲线。基于此关系曲线,由确定应力到随机应力,再到服役工况种类的随机性,逐步建立疲劳可靠性模型。应用提出方法评估一服役后铝合金构件的疲劳寿命。结果表明,逐渐缩小区间搜索方法可在短时间内获得高精度的P-S-N曲线,提出的疲劳可靠性模型贴近工程,传统疲劳可靠性模型的结果偏于保守。

关键词: 材料分散性, 疲劳可靠性, 随机载荷, 小样本, 样本集聚

Abstract: As to obtain more accurate life assessment under random loading history with small sampling or large dispersion life data, a diminishing range search method and fatigue reliability models with full consideration of stochastic load and material dispersion are introduced on the basis of sample polymerization principle, and the method of determining the relationship curves of stress - life is improved as well. The core idea of the diminishing range search method is the internal approximation methodology. The range of optimal values will reduce after each search cycle. The searching cannot be stopped until find the result of meeting an assigned tolerance, and then fit stress - life curve. Based on this curve, fatigue life reliability models of stochastic loads are generally constructed from the deterministic constant amplitude loading to random cyclic stress values, and to different kinds of serving loading. The introduced methods are applied to fatigue life assessment of an aluminum structure which has experienced a period of service time. It indicates that, the diminishing range search method can obtain high accuracy P-S-N curves in a short time, and that the proposed fatigue reliability models are more close to engineering, whilst the results of traditional fatigue reliability model are quit conservative.

Key words: fatigue reliability, material dispersion, random loading, sample-polymerization, small sample

中图分类号:

TH122

白鑫, 谢里阳, 钱文学. 基于样本集聚原理的疲劳可靠性评估方法及其在零部件上的应用[J]. 机械工程学报, 2016, 52(6): 206-210.

BAI Xin, XIE Liyang, QIAN Wenxue. Fatigue Probability Evaluation Method Based on the Principle of Sample-polymerization[J]. Journal of Mechanical Engineering, 2016, 52(6): 206-210.

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基于样本集聚原理的疲劳可靠性评估方法及其在零部件上的应用

Fatigue Probability Evaluation Method Based on the Principle of Sample-polymerization

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