中国机械工程 ›› 2023, Vol. 34 ›› Issue (22): 2659-2664,2673.DOI: 10.3969/j.issn.1004-132X.2023.22.002

• 机械基础工程 • 上一篇    下一篇

考虑载荷交互影响的非均匀损伤累积模型

吴志峯;高建雄;徐蓉霞;朱鹏年   

  1. 新疆大学机械工程学院,乌鲁木齐,830017
  • 出版日期:2023-11-25 发布日期:2023-12-14
  • 通讯作者: 高建雄(通信作者),男,1988年生,副教授。E-mail:jianxionggao888@163.com。
  • 作者简介:吴志,男,1994年生,硕士研究生。研究方向为结构的疲劳寿命预测理论。

A Non-uniform Damage Accumulation Model Considering Load Interactions

WU Zhifeng;GAO Jianxiong;XU Rongxia;ZHU Pengnian   

  1. School of Mechanical Engineering,Xinjiang University,Urumqi,830017
  • Online:2023-11-25 Published:2023-12-14

摘要: 为研究金属构件的疲劳损伤演化规律,建立了考虑载荷交互影响的非均匀损伤累积模型及寿命预测理论。首先,提出一种恒幅载荷下基于剩余寿命的非均匀疲劳损伤模型。其次,阐述了载荷加载次序效应,并证明该非均匀损伤模型可考虑载荷加载次序效应。再次,验证了载荷间的相互作用,提出相邻两级载荷存在相互影响,定义并引入了载荷交互影响因子,建立了等效损伤新模型。最后,将非均匀损伤模型与等效损伤新模型结合,构造了多级变幅载荷下的非均匀损伤模型。以30NiCrMoV12钢和Al-2024-T45合金的两级载荷加载试验数据进行寿命预测,通过与多种模型进行对比,验证了所提模型可较好地预测疲劳寿命。所提模型对金属的损伤演化规律有一定参考价值。

关键词: 损伤演化规律, 非均匀损伤模型, 损伤等效法则, 交互影响因子, 疲劳寿命预测

Abstract:  In order to study the evolution law of fatigue damage of metal components, a non-uniform damage accumulation model and life prediction theory were established considering the interaction of loads. First, a non-uniform fatigue damage model was proposed based on residual life under constant amplitude loading. Secondly, the loading sequence effect was expounded, and it was proved that the proposed load loading sequence effect might be considered in the non-uniform damage model. Then, the interaction among loads was verified, and it was proposed that there was mutual influence between adjacent two-level loads, the load interaction factor was defined and introduced, and a new equivalent damage model was established. Finally, combining the non-uniform damage model with the new equivalent damage model, a non-uniform damage model was constructed under multi-level variable amplitude loads. Life prediction was carried out with the test data of 30NiCrMoV12 steel and Al-2024-T45 alloy under two-level loading. By comparing with various models, it was verified that the proposed model may predict fatigue life well. The proposed model has a certain reference value for the damage evolution law of metals. 

Key words: law of damage evolution, non-uniform damage model, law of damage equivalence, interaction impact factor, fatigue life prediction

中图分类号: