缺口-尺寸效应下疲劳寿命预测：考虑应力梯度的临界距离理论

doi:10.3901/JME.2023.16.090

机械工程学报 ›› 2023, Vol. 59 ›› Issue (16): 90-106.doi: 10.3901/JME.2023.16.090

• 特邀专栏:机械结构强度设计与完整性评估 • 上一篇下一篇

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缺口-尺寸效应下疲劳寿命预测：考虑应力梯度的临界距离理论

何金超¹, 朱顺鹏^1,2,3, 牛晓鹏¹, 廖鼎¹, 王清远^2,3,4

1. 电子科技大学机械与电气工程学院成都 611731;
2. 四川大学深地科学与工程教育部重点实验室成都 610065;
3. 四川大学破坏力学与工程防灾减灾四川省重点实验室成都 610065;
4. 成都大学高等研究院成都 610106

收稿日期:2022-09-16 修回日期:2023-03-12 出版日期:2023-08-20 发布日期:2023-11-15
通讯作者: 朱顺鹏(通信作者),男,1983年出生,博士,教授,博士研究生导师。主要研究方向为结构完整性与可靠性分析、损伤容限设计与寿命预测、人工智能与健康评估。E-mail:zspeng2007@uestc.edu.cn
作者简介:何金超,男,1995年出生,博士研究生。主要研究方向为疲劳可靠性与寿命预测。E-mail:jinchaohe_uestc@163.com;王清远,男,1965年出生,博士,教授,博士研究生导师。主要研究方向为新型材料与结构力学问题、超长寿命疲劳与可靠性、实验力学等。E-mail:wangqy@scu.edu.cn
基金资助:
国家自然科学基金重点(12232004);四川省杰出青年基金(2022JDJQ0024);深地科学与工程教育部重点实验室(四川大学)开放基金(DESE201901)资助项目。

Notch Fatigue Life Prediction under Size Effect:Stress Gradient-based Theory of Critical Distance

HE Jinchao¹, ZHU Shunpeng^1,2,3, NIU Xiaopeng¹, LIAO Ding¹, WANG Qingyuan^2,3,4

1. School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731;
2. MOE Key Laboratory of Deep Earth Science and Engineering, Sichuan University, Chengdu 610065;
3. Failure Mechanics and Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province, Sichuan University, Chengdu 610065;
4. Advanced Research Institute, Chengdu University, Chengdu 610106

Received:2022-09-16 Revised:2023-03-12 Online:2023-08-20 Published:2023-11-15

摘要/Abstract

摘要： 疲劳断裂是金属材料最普遍的失效模式之一，而由缺口特征引发的应力梯度效应更是工程部件抗疲劳设计的关键瓶颈问题。因此，发展高精度的缺口疲劳强度分析方法是保障工程结构服役完整性的关键。据此，提出耦合临界距离理论与Weibull分布的缺口件疲劳寿命预测模型，并综合考虑尺寸效应及应力梯度效应对临界距离的影响。研究表明，在给定疲劳寿命下，临界距离随应力梯度增大而减小，故提出基于相对应力梯度修正的临界距离模型，以合理量化尺寸效应对临界距离的影响。最后，基于镍基合金GH4169与铝合金Al 2024-T351的缺口疲劳试验数据进行模型验证与对比，结果表明新模型相较于传统临界距离理论预测精度显著提高。

关键词: 缺口, 疲劳, 临界距离, 应力梯度, 尺寸效应

Abstract: Fatigue fracture is one of the most common failure modes of metallic materials. The stress gradient effect induced by the notch features are the key problem in anti-fatigue design of engineering components. Therefore, developing reliable notch fatigue methods is significant for maintaining service integrity of engineering structures. In view of this, a notch fatigue life prediction model combining the theory of critical distance and the Weibull distribution is developed. In addition, both the influence of stress gradient effect and the size effect on the critical distance are considered. Specifically, under given loading cycles, the critical distance decreases with the increase of the stress gradient. Therefore, a relative stress gradient modified critical distance model is proposed to quantify the size effect. Finally, experimental data of nickel-based alloy GH4169 and aluminium alloy Al 2024-T351 are utilized for model validation and comparison, and results indicated that the proposed model shows better predictive ability than the traditional method.

Key words: notch, fatigue, critical distance, stress gradient, size effect

中图分类号:

TH114

何金超, 朱顺鹏, 牛晓鹏, 廖鼎, 王清远. 缺口-尺寸效应下疲劳寿命预测：考虑应力梯度的临界距离理论[J]. 机械工程学报, 2023, 59(16): 90-106.

HE Jinchao, ZHU Shunpeng, NIU Xiaopeng, LIAO Ding, WANG Qingyuan. Notch Fatigue Life Prediction under Size Effect:Stress Gradient-based Theory of Critical Distance[J]. Journal of Mechanical Engineering, 2023, 59(16): 90-106.

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缺口-尺寸效应下疲劳寿命预测：考虑应力梯度的临界距离理论

Notch Fatigue Life Prediction under Size Effect:Stress Gradient-based Theory of Critical Distance

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