FRP片材加固界面补丁式剥离损伤的光纤检测技术  

Optical fiber detection technology for patch peeling damage in FRP reinforcement interface

作　　者：许颖 李伟文[2] 王德祥 张威凯 XU Ying;LI Weiwen;WANG Dexiang;ZHANG Weikai(Shenzhen Key Laboratory of Urban and Civil Engineering Disaster Prevention and Mitigation,Harbin Institute of Technology(Shenzhen),Shenzhen 518055»China;Shenzhen Durability Center for Civil Engineering,Guangdong Provincial Key Laboratory of Durability for Civil Engineer!ng,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]哈尔滨工业大学(深圳)城市与土木工程防灾减灾深圳市重点实验室,深圳518055 [2]深圳大学广东省滨海土木工程耐久性重点实验室,深圳市土木工程耐久性重点实验室,深圳518060

出　　处：《无损检测》2019年第12期1-6,共6页Nondestructive Testing

基　　金：国家自然科学基金面上项目（51778191）;深圳市科技计划项目（JCYJ20170307145853300）;广东省滨海土木工程耐久性重点实验室开放基金资助（GDDCE 17-4）

摘　　要：FRP(纤维增强复合材料)片材加固界面出现剥离损伤是影响FRP加固效果甚至引起结构脆性破坏的重要原因,实际工程中,剥离大都以补丁形式存在于FRP片材与被加固结构间,肉眼无法观察。将Mach-Zehnder光纤干涉仪的传感臂黏贴在FRP加固片材表面,用软胶榔头沿设定的位置在FRP件表面逐点加载。由光纤干涉仪测量每次加载时光纤的积分应变量,得出加载点与光纤积分应变量的关系曲线,从曲线的曲率或者正负值突变来判别补丁式剥离损伤的位置和大小。试验结果表明,该方法对于FRP加固结构补丁式剥离层具有较好的可测性。The interfacial debonding in FRP bonded repair will affect the bonding strength and lead to failure of the repair without warning.Unfortunately the interfacial damage is normally invisible and often in the form of a patch rather than a through-width crack.In this article,a debonding patch detection technique based on fiber optic interferometry is proposed.A quasi-impulse loading is applied with a rubber-head hammer and the total elongation of a surface-mounted optical fiber along the length of the repair material is measured as a function of load position.When a debonding patch is present,the induced sudden slope or sign change on the plot of fiber integral strain vs.load position will reveal the extent and location of the debonded area.The results of the study indicate that the proposed technique is applicable for debonding patch detection in repaired members under various support conditions.

关 键 词：FRP 结构加固 补丁式剥离损伤 光纤干涉仪 无损检测 

分 类 号：TG115.28[金属学及工艺—物理冶金] TB330.1[金属学及工艺—金属学]