CFRP板-钢粘结界面疲劳性能试验研究
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作者单位:

1.广西大学;2.长沙理工大学;3.西南交通大学

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中图分类号:

TU398.9

基金项目:

国家自然科学基金项目(52078059,51878186);河北省大型结构健康诊断与控制重点实验室开放基金重点项目(KLLSHMC210);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)


Experimental Investigation on Fatigue Behavior of Bonding Interface Between CFRP Laminates and Steel
Author:
Affiliation:

1.Guangxi University;2.Changsha University of Science &3.Technology;4.Southwest Jiaotong University

Fund Project:

National Natural Science Foundation Project of China (52078059,51878186); Foundation of Key Laboratory of Large Structure Health Monitoring and Control in Hebei Province (KLLSHMC2103); National Key Research and Development Program of China (2021YFB2600900); Scientific Research Basic Ability Promotion Project for Young and Middle-aged Teachers at Colleges in Guangxi Zhuang Autonomous Region (2022KY0009)

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    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,分析了粘结界面的疲劳性能,比较了基于平均粘结应力幅或局部粘结应力幅的中值及设计S-N曲线的适用性.结果表明:疲劳荷载下CFRP-钢接头的主要破坏模式为钢-胶层界面剥离或钢-胶层/CFRP-胶层界面剥离的混合破坏模式;不同荷载水平下的荷载-位移曲线的斜率变化趋势大致相同;界面损伤从界面粘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疲劳寿命时,基于平均粘结应力幅的S-N曲线的拟合优越性更加显著,疲劳极限为1.88 MPa;最后,给出了具有95%可靠度的疲劳设计S-N曲线.

    Abstract:

    The fatigue experiments of carbon fiber reinforced polymer (CFRP) laminates-steel double lap joints were carried out. Considering the effects of load levels, the fatigue behaviors of the interface were analyzed. Meantime, the applicability of the mean S-N curve and design 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-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 breaks. Using a power function formula to predict fatigue life, 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 fatigue design S-N curve with 95% probability is given.

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  • 收稿日期:2022-03-04
  • 最后修改日期:2022-05-05
  • 录用日期:2022-05-09
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