摘要
开展了碳纤维增强聚合物(CFRP)板-钢双搭接试件的疲劳试验,考虑荷载水平的影响,分析了黏结界面的疲劳性能,比较了基于平均黏结应力幅或局部黏结应力幅的中值及设计疲劳曲线(S-N曲线)的适用性.结果表明:疲劳荷载下CFRP板-钢接头的主要破坏模式为钢-胶层界面剥离或钢-胶层/CFRP板-胶层界面剥离的混合破坏模式;不同荷载水平下荷载-位移曲线斜率的变化趋势大致相同;界面损伤从界面黏结应力较大的加载端开始,逐渐向自由端扩展,扩展至一定程度后界面突然断裂;采用幂函数公式预测试件的疲劳寿命时,基于平均黏结应力幅S-N曲线的拟合优越性更为显著,疲劳极限为1.88 MPa;最后,给出了具有95%可靠度的设计S-N曲线.
The fatigue experiments of carbon fiber reinforced polymer(CFRP)laminates-steel double lap joint specimens were carried out.Considering the effects of load levels,the fatigue behaviors of the interface were analyzed.Meantime,the applicability of the mean stress-number of cycle(S-N)curve and designed S-N curve based on mean or local bond stress range were compared.The results show that the main failure modes of specimens under fatigue load are steel-adhesive interface debonding or the mixed mode of steel-adhesive and CFRP laminate-adhesive interface debonding.The slope variation trend of load-displacement curves at different load levels is roughly the same.The interface damage starts from the load end with larger interfacial bond stress and gradually extends to the free end.After expanding to a certain extent,the interface suddenly fails.Using a power function formula to predict fatigue life of specimen,the fitting superiority of S-N curve based on mean bond stress range is more significant,and the fatigue limit is 1.88 MPa.Finally,the designed S-N curve with 95%probability is given.
作者
柯璐
朱夫瑞
李传习
陈正
张清华
KE Lu;ZHU Furui;LI Chuanxi;CHEN Zheng;ZHANG Qinghua(Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2023年第3期266-274,共9页
Journal of Building Materials
基金
国家自然科学基金资助项目(52208307,52078059,51878186)
“十四五”国家重点研发计划项目(2021YFB2600900)
广西高校中青年教师科研基础能力提升项目(2022KY0009)。
关键词
碳纤维增强聚合物
钢板
黏结界面
疲劳性能
疲劳曲线
carbon fiber reinforced polymer(CFRP)
steel plate
bonding interface
fatigue behavior
stress-number of cycle curve