金属材料疲劳性能预测统一模型探索
作者简介 张哲峰,男,1970年生,研究员,博士
收稿日期: 2018-07-18
网络出版日期: 2018-08-03
基金资助
国家自然科学基金项目Nos.51331007、51501198和51771208,中国科学院战略性先导科技专项项目No.XDB22020202
Exploration on the Unified Model for Fatigue Properties Prediction of Metallic Materials
Received date: 2018-07-18
Online published: 2018-08-03
Supported by
Supported by National Natural Science Foundation of China (Nos.51331007, 51501198 and 51771208) and the Strategic Priority Research Program of Chinese Academy of Sciences (No.XDB22020202)
金属材料的疲劳可分为高周疲劳与低周疲劳,通常分别以应力幅与应变幅作为损伤参量;疲劳性能评价标准在高周与低周疲劳交界处的断层导致抗疲劳材料设计与选择的困难。本文通过对纯Cu及Cu-Al系列合金高周、低周(含超低周)疲劳性能与微观损伤机制的系统研究,提出了统一高周与低周性能的三维疲劳性能预测模型,并由其关键参数进一步提出了基于能量的疲劳性能统一评价标准。该模型建立在应力幅-应变幅-疲劳寿命三维坐标系下,可通过投影的方式获得循环应力-应变(CSS)曲线、应力-寿命(S-N)曲线与应变-寿命(E-N)曲线,模型函数在特定条件下也可转化为Basquin公式、Coffin-Manson公式与滞回能模型形式,从而在经典理论基础上为疲劳性能评价与优化问题提供了新的视角。
张哲峰 , 刘睿 , 张振军 , 田艳中 , 张鹏 . 金属材料疲劳性能预测统一模型探索[J]. 金属学报, 2018 , 54(11) : 1693 -1704 . DOI: 10.11900/0412.1961.2018.00331
The fatigue of metallic materials can be divided into high-cycle fatigue (HCF) and low-cycle fatigue (LCF); the damage of these two types of fatigue is commonly evaluated through stress amplitude and strain amplitude of cyclic loading, respectively. The mismatch of the evaluation standards between HCF and LCF leads to difficulties in the design and selection of anti-fatigue materials. Under this condition, systematic researches on fatigue properties and microscopic damage mechanisms of HCF, LCF and extra-low-cycle fatigue (ELCF) for pure Cu and Cu-Al alloys were summarized in this work. On the bases of the experimental results, a three-dimensional fatigue model is proposed, which is simultaneously applicable to both the HCF and LCF properties. The model is built up in a three-dimensional coordinate system of stress amplitude-strain amplitude-fatigue life; it could be associated with the cyclic stress-strain (CSS) curve, S-N curve and E-N curve through the projection method, or be transformed into the Basquin equation, Coffin-Manson equation and hysteretic energy model under specific conditions. In this way, this generally applicable fatigue model helps provide a new viewpoint for the evaluation and optimization of fatigue properties based on the classical fatigue theories.
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