复合材料科学与工程Issue(2)：99-107,9.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
Correlation between structural frequencies and bending fatigue life of CFRP laminates exposed in hygrothermal environment
摘要
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 experi-ment,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 frac-ture 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 tempera-ture 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 struc-tural frequencies.关键词
湿热效应/复合材料层合板/弯曲疲劳寿命/结构频率Key words
hygrothermal effect/composite laminate/bending fatigue life/structural frequency引用本文复制引用
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,(2):99-107,9.基金项目
广东省自然科学基金项目(2022A1515011433) （2022A1515011433）
高等学校学科创新引智计划(D21021) （D21021）
广州市科技计划项目(20212200004) （20212200004）
