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为了确保纤维复合材料(FRP)加固结构的可靠性和安全性,界面损伤检测是加固质量检查中的一个重要环节。基于薄板自由振动理论,提出一种声-光纤无损检测(NDE)FRP加固结构界面损伤的原理和方法,利用可变频的扬声器产生集中声束作用在FRP加固构件表面形成表面局部振动场,界面损伤引起的局部异常振动区的振动情况可以由粘贴在FRP表面的光纤测得,从而确定损伤的位置和大小。数值模拟分析和实验结果都表明了此方法用于FRP加固结构界面损伤检测的可行性。
In order to ensure the reliability and safety of fiber reinforced plastic (FRP) reinforced structure, the interface damage detection is an important part of the reinforcement quality inspection. Based on the theory of free vibration of thin plate, a theory and method of interface damage of FRP reinforced structure with acoustic-optical fiber non-destructive testing (NDE) is proposed. Local surface acoustic field and interfacial damage The vibration of the local anomalous vibration zone can be measured by optical fiber affixed to the surface of the FRP to determine the location and size of the damage. Both numerical simulation and experimental results show the feasibility of this method for the interface damage detection of FRP strengthened structures.