盐蚀/冻融环境下环氧树脂结构胶强度降解机理  

Strength degradation mechanism of epoxy resin structural adhesive under chlorine salt corrosion/freeze-thaw environment

作　　者：任翔[1] 崔桐 王怡 孙亚民 刘群峰 Ren Xiang;Cui Tong;Wang Yi;Sun Yamin;Liu Qunfeng(School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]西安科技大学建筑与土木工程学院,西安710054

出　　处：《东南大学学报（自然科学版）》2024年第5期1182-1192,共11页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51408484,52108246).

摘　　要：为探究盐蚀/冻融循环作用对环氧树脂胶黏剂材料的拉伸、剪切性能的影响,分别开展了40个胶黏剂和40个单搭接接头的盐蚀/冻融循环试验和力学性能试验,分析其力学性能随环境作用时间的变化规律.研究表明,随环境作用时间增加,所有胶黏剂试件失效模式未发生变化,而单搭接接头由内聚破坏和界面脱黏的混合失效模式变为界面脱黏失效模式.胶黏剂试件的拉伸强度总体呈现下降趋势,210次盐蚀/冻融循环后降低了9.2%.水分在单搭接接头界面的扩散速率远大于胶黏剂试件,导致了单搭接接头剪切强度相对于胶黏剂拉伸强度下降更为显著,210次盐蚀/冻融循环后剪切强度降低了60.9%.此外,盐蚀/冻融循环2160次后,胶黏剂拉伸强度保留率约为31.1%,而单搭接接头已失效.To investigate the effects of salt corrosion/freeze-thaw cycles on the tensile and shear properties of epoxy resin adhesive materials,chlorine salt corrosion/freeze-thaw cycle tests and mechanical performance tests were conducted on 40 adhesives and 40 single-lap joints,respectively,to analyze the variations of their mechanical properties with environmental exposure time.Research shows that as the environmental exposure time increases,the failure mode of all adhesive specimens remains unchanged,while the single-lap joint changes from a mixed failure mode of cohesive failure and interface debonding to an interface debonding failure mode.The tensile strength of the adhesive specimens shows an overall downward trend,with a decrease of 9.2%after 210 chlorine salt corrosion/freeze-thaw cycles.The diffusion rate of water at the interface of single-lap joints is much higher than that of adhesive specimens,resulting in a more significant decrease in the shear strength of single-lap joints compared with adhesive tensile strength.After 210 chlorine salt corrosion/freeze-thaw cycles,the shear strength decreases by 60.9%.In addition,after 2160 chlorine salt corrosion/freeze-thaw cycles,the retention rate of adhesive tensile strength is about 31.1%,and the single-lap joint has failed.

关 键 词：环氧树脂胶黏剂 CFRP板 盐蚀/冻融循环 强度 弹性模量 孔隙结构 

分 类 号：TU391[建筑科学—结构工程]