温湿环境下CFRP层合板的弯曲疲劳寿命与结构频率的关联性研究

doi:10.19936/j.cnki.2096-8000.20250228.013

复合材料科学与工程 ›› 2025, Vol. 0 ›› Issue (2): 99-107.DOI: 10.19936/j.cnki.2096-8000.20250228.013

温湿环境下CFRP层合板的弯曲疲劳寿命与结构频率的关联性研究

吕林泽, 张芝芳^*, 郑铭峰, 江剑

广州大学风工程与工程振动研究中心,广州 510006

收稿日期:2023-11-30 出版日期:2025-02-28 发布日期:2025-03-25
通讯作者: 张芝芳(1985—),女,博士,副研究员,硕士生导师,研究方向为FRP复合材料的损伤识别和健康监测、复合材料疲劳寿命预测、复合材料低速冲击,zfzhang@gzhu.edu.cn。
作者简介:吕林泽(1997—),男,硕士研究生,研究方向为复合材料疲劳寿命预测。
基金资助:
广东省自然科学基金项目(2022A1515011433);高等学校学科创新引智计划(D21021);广州市科技计划项目(20212200004)

Correlation between structural frequencies and bending fatigue life of CFRP laminates exposed in hygrothermal environment

LÜ Linze, ZHANG Zhifang^*, ZHENG Mingfeng, JIANG Jian

Research Center for Wind Engineering and Engineering Vibration, Guangzhou University, Guangzhou 510006, China

Received:2023-11-30 Online:2025-02-28 Published:2025-03-25

摘要/Abstract

摘要： 纤维增强复合材料(FRP)层合结构在温湿环境下的疲劳性能会加速退化,影响结构使用安全,缩短结构服役寿命。为研究温湿环境下FRP结构的弯曲疲劳行为,对碳纤维增强复合材料(CFRP)层合板进行了不同温度下的水浴吸湿试验,对达到吸湿平衡状态的试件进行了弯曲疲劳试验和模态测试。试验过程中,每隔一定循环次数会停止施加弯曲疲劳荷载,对试件进行模态测试以获取在该疲劳状态下CFRP层合板的固有频率。结果表明:疲劳破坏发生在夹持端部位,主要表现为横截面处的脆性断裂,断口处呈现锯齿状;随着循环次数增加,CFRP试件的振动频率先突降后渐降,且频率下降幅度顺序为高温湿态(ETW)>常温湿态(RTW)>常温干态(RTD);相比RTD工况,RTW和ETW工况下CFRP试件的弯曲疲劳寿命分别下降8.96%和21.2%,表明温度和湿度耦合作用比单一作用对CFRP层合板的弯曲疲劳寿命影响更大,且温度比湿度因素对弯曲疲劳寿命的影响大。本文还推导了结构振动频率与CFRP层合板的弯曲疲劳寿命之间的定量关联公式,为基于结构频率预测FRP层合板的剩余弯曲疲劳寿命提供了理论依据。

关键词: 湿热效应, 复合材料层合板, 弯曲疲劳寿命, 结构频率

Abstract: The fatigue performance of fiber reinforced polymer (FRP) laminated structures can be degraded rapidly in a humid and warm environment, affecting the safety of the FRP structures and shortening their service life. To study the bending fatigue life of FRP structures in a humid and warm environment, water absorption under different temperatures were conducted on carbon fiber reinforced polymer (CFRP) laminates. Bending fatigue tests and modal testing were performed on the specimens that reached a state of moisture equilibrium. During the experiment, the fatigue loading was interrupted after a number of fatigue cycles, and modal testing were then conducted on the fatigue specimens to obtain the natural frequencies of the CFRP laminated plates. The results showed that fatigue failure occurred at the clamping end, mainly manifested as brittle fracture at the cross-section, with a serrated fracture surface. As the number of fatigue cycles increased, the vibrational frequencies of the CFRP specimens firstly dropped dramatically and then decreased gradually. The frequency reduction rate is following elevated temperature and wet condition (ETW)>room temperature and wet condition (RTW)>room temperature and dry condition (RTD). Compared with the RTD condition, the bending fatigue life of the FRP specimens under the RTW and ETW conditions decreased by 8.96% and 21.2% respectively, indicating that the combined effect of both temperature and humidity has a greater impact on the bending fatigue life of CFRP structures than a single factor, and the temperature has a greater impact than the humidity factor. A quantitative equation has been derived to correlate the structural frequencies and the bending fatigue life of FRP laminates. The outcomes of current work can provide a theoretical basis support for predicting the remaining bending fatigue life of FRP laminated plates through the structural frequencies.

Key words: hygrothermal effect, composite laminate, bending fatigue life, structural frequency

中图分类号:

TB332

吕林泽, 张芝芳, 郑铭峰, 江剑. 温湿环境下CFRP层合板的弯曲疲劳寿命与结构频率的关联性研究[J]. 复合材料科学与工程, 2025, 0(2): 99-107.

LÜ Linze, ZHANG Zhifang, ZHENG Mingfeng, JIANG Jian. Correlation between structural frequencies and bending fatigue life of CFRP laminates exposed in hygrothermal environment[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(2): 99-107.

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温湿环境下CFRP层合板的弯曲疲劳寿命与结构频率的关联性研究

Correlation between structural frequencies and bending fatigue life of CFRP laminates exposed in hygrothermal environment

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