Detection of patch debonding in composite repaired cracked metallic specimens, using optical fibers and sensors
Detection of patch debonding in composite repaired cracked metallic specimens, using optical fibers and sensors
复制标题
使用光纤和传感器检测复合材料修复裂纹金属样本中的补丁脱粘
DOI：
10.1117/12.503774
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Z. Marioli
中科院分区：
文献类型：
--
作者：
G. Tsamasphyros;G. Kanderakis;Nikolaos K. Furnarakis;Z. Marioli
使用有限元分析研究了用“智能”粘合复合补片修复的经典裂纹金属结构，以确定光学网络的脱粘检测能力并选择适当的光纤路径和布拉格光栅传感器位置。该补片通过薄粘合层粘合在破裂的铝板上，同时假设金属的主载荷轴平行于光纤的方向。考虑了不同的光纤路径和传感器位置，并研究了它们测量由于裂纹尖端周围的补片脱粘传播而产生的应变场变化的能力。结论是，光纤网络能够评估裂纹尖端周围不断增加的脱粘面积，并且可以提供有关监测复合补片增强结构的结构完整性所需的关键参数的足够信息（即补片脱粘边界和裂纹尖端位置处产生的应变）。每根光纤裂纹的每一侧应至少使用两个布拉格光栅传感器，以便能够充分监测粘合剂脱粘和裂纹扩展。
A classical cracked metallic structure repaired with a "smart" bonded composite patch has been studied, using finite element analysis, in order to determine the debonding detection capabilities of the optical network and to select the appropriate optical fibers paths and Bragg Grating sensors locations. The patch is bonded over a cracked aluminum plate, by means of a thin adhesive layer, while the primary loading axis of the metal is assumed to be parallel to the direction of the optical fibers. Different optical fiber paths and sensor positions were considered and their ability to measure the variation of the developed strain field due to the patch debonding propagation around the crack tip was studied. It was concluded that a fiber optics network is capable of evaluating the increasing debonding area around the crack tip and can provide adequate information concerning the critical parameters required for the monitoring of the structural integrity of composite patch reinforced structures (i.e. strains developed at the patch debonding boundary and position of the crack tip). At least two Bragg Grating sensors should be used at each side of the crack per optical fiber, to enable adequate monitoring of the adhesive debonding and crack propagation.