Optical fiber detection technology for patch peeling damage in FRP reinforcement interface
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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。Abstract: 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.
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Keywords:
- FRP /
- bonded repair /
- debonding patch /
- fiber-optic interferometer /
- nondestructive testing
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