不同温度下混合材料机械连接结构疲劳分析的SSF法

doi:10.3901/JME.2024.18.138

机械工程学报 ›› 2024, Vol. 60 ›› Issue (18): 138-145.doi: 10.3901/JME.2024.18.138

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不同温度下混合材料机械连接结构疲劳分析的SSF法

曹镜¹, 姚卫星¹, 梁德利², 王彬文³

1. 南京航空航天大学航空航天结构力学及控制全国重点实验室南京 210016;
2. 北京宇航系统工程研究所北京 100076;
3. 中国飞机强度研究所强度与结构完整性全国重点实验室西安 710065

收稿日期:2023-10-20 修回日期:2024-08-06 出版日期:2024-09-20 发布日期:2024-11-15
作者简介:曹镜,男,1997年出生,博士研究生。主要研究方向为飞机结构疲劳、载荷环境谱设计。E-mail:caojing@nuaa.edu.cn
姚卫星(通信作者),男,1957年出生,博士,教授,博士研究生导师。主要研究方向为飞机结构疲劳、可靠性、优化设计。E-mail:wxyao@nuaa.edu.cn
基金资助:
国家自然科学基金(52075244)和民机科研(MJZ3-2N21-3)资助项目。

SSF Method for Fatigue Analysis of Mechanically Fastened Hybrid-material Structures at Different Temperatures

CAO Jing¹, YAO Weixing¹, LIANG Deli², WANG Binwen³

1. State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016;
2. Beijing Institute of Space System Engineering, Beijing 100076;
3. State Key Laboratory of Strength and Structural Integrity, Aircraft Strength Research Institute of China, Xi'an 710065

Received:2023-10-20 Revised:2024-08-06 Online:2024-09-20 Published:2024-11-15

摘要/Abstract

摘要： 为评估环境温度变化对混合材料机械连接结构疲劳性能的影响，提出了混合材料机械连接结构疲劳性能分析的应力严重系数(Stress-severity-factor, SSF)方法。考虑不同材料在不同环境温度下的热变形，建立混合材料多排钉连接结构的钉传载荷和旁路载荷计算模型，然后定义并计算危险细节的SSF值，结合材料的S-N曲线可以估算连接结构在不同环境温度下的疲劳寿命。采用7050-T7451铝合金/CFRP层合板三钉单搭混合连接试件在不同环境温度下开展疲劳试验，对提出的疲劳寿命分析方法进行验证。结果表明，不同材料的热变形差异会影响结构的传力行为，进而使得结构在不同环境温度下表现出不同的SSF值，疲劳寿命预测结果与试验结果之间的相对误差小于20%，该方法便捷高效，为复杂环境下混合材料机械连接结构的疲劳寿命分析提供了有力的支撑。

关键词: 混合材料, 机械连接, 环境温度, 疲劳寿命, 应力严重系数

Abstract: To evaluate the influence of ambient temperature change on fatigue performance of mechanically fastened hybrid-material structures, a stress-severity-factor (SSF) method is proposed for the fatigue analysis of mechanically fastened hybrid-material structures. Considering the thermal deformations of different materials at different ambient temperatures, the calculation model of bolt loads and bypass loads for the multi-row-bolt-fastened hybrid-material structures is established. Then, the SSF value of hazard details is defined and calculated, and fatigue lives of fastened structure at different ambient temperatures can be estimated based on S-N curves of the materials. Fatigue tests of 7050-T7451 aluminum alloy/CFRP laminate three-bolt single-lapped hybrid fastened specimens are carried out at different ambient temperatures to verify the proposed fatigue life analysis method. The results show that the thermal deformation difference of different materials will affect the force-transfer behavior of structure, and then the structure show different SSF values at different ambient temperatures. The relative errors between the prediction results and test results of fatigue lives are less than ±20%. The method is convenient and efficient, which provides a strong support for the fatigue life analysis of mechanically fastened hybrid-material structures under the complex environments.

Key words: hybrid material, mechanical fastening, ambient temperature, fatigue life, stress severity factor

中图分类号:

V215

曹镜, 姚卫星, 梁德利, 王彬文. 不同温度下混合材料机械连接结构疲劳分析的SSF法[J]. 机械工程学报, 2024, 60(18): 138-145.

CAO Jing, YAO Weixing, LIANG Deli, WANG Binwen. SSF Method for Fatigue Analysis of Mechanically Fastened Hybrid-material Structures at Different Temperatures[J]. Journal of Mechanical Engineering, 2024, 60(18): 138-145.

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不同温度下混合材料机械连接结构疲劳分析的SSF法

SSF Method for Fatigue Analysis of Mechanically Fastened Hybrid-material Structures at Different Temperatures

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