氯盐侵蚀环境下液体橡胶改性CFRP-钢界面耐久性  

Durability of CFRP-steel interface modified by liquid rubber under chlorine salt erosion

作　　者：庞育阳 吕远晨 王强 PANG Yuyang;LYU Yuanchen;WANG Qiang(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]郑州大学土木工程学院,郑州450001 [2]河北工业大学土木与交通学院,天津300401

出　　处：《复合材料学报》2024年第6期3215-3227,共13页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52008377);中国博士后科学基金(2021M692940);河北省自然科学基金(E2023202048)。

摘　　要：设计了54个碳纤维增强树脂复合材料(CFRP)-钢双搭接试件,研究了液体橡胶改性剂掺量和腐蚀龄期对CFRP-钢改性界面在高温水浴和常温干湿循环两种氯盐侵蚀作用后力学性能的影响。结果表明:在高温水浴及常温干湿循环作用下未改性试件分别呈现CFRP层间剥离破坏和钢/粘结剂界面剥离破坏,而液体橡胶改性试件可将破坏模式转变为粘结剂内聚破坏,其中10wt%液体橡胶提升界面耐久性效果最优,在高温水浴和常温干湿循环氯盐侵蚀180天后,试件极限荷载保留率相较未改性试件分别提升了28.11%和29.94%。基于试验结果,建立了适用于两种氯盐侵蚀环境下的改性界面粘结-滑移模型,模型预测结果与试验结果吻合较好。Fifty-four carbon fiber reinforced resin composite(CFRP)-steel double lap specimens were designed to study the effects of liquid rubber modifier content and corrosion age on the mechanical properties of CFRP-steel modified interface under the erosion of two kinds of chlorine salts:High temperature water bath and dry-wet cycles at normal temperature.The results show that under the action of high temperature water bath and dry-wet cycles at normal temperature,the unmodified specimens show CFRP interlayer stripping failure and steel/binder interface stripping failure,respectively,while the liquid rubber modified specimens could transform the failure mode into adhesive cohesion failure,among which 10wt%liquid rubber has the best effect on improving interface durability.After 180 days of high temperature water bath and dry-wet cycles chloride salt erosion at normal temperature,the ultimate load retention rates of the specimens increase by 28.11%and 29.94%,respectively,compared with that of the unmodified specimens.Based on the experimental results,modified interface bond-slip models are established which are suitable for two kinds of chlorine salt erosion environments,and the predicted results are in good agreement with the experimental results.

关 键 词：氯盐侵蚀 液体橡胶改性 CFRP加固钢板 粘结-滑移关系 耐久性 

分 类 号：TB333[一般工业技术—材料科学与工程]