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Sensitivity of embedded fibre optic Bragg grating sensors to disbonds in bonded composite ship joints

机译：嵌入式光纤布拉格光栅传感器对粘结的复合船缝脱粘的敏感性

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摘要

The potential application of embedded fibre optic Bragg grating strain sensors for the health monitoring of adhesively bonded composite ship joints is investigated in this paper. Bragg grating sensors were embedded at various locations along the interface of adhesively bonded glass-reinforced plastic composite joints with artificially introduced disbonds to assess their capability to detect bond-line damage under in-plane shear and through-thickness tension. Finite element (FE) models indicated that the presence of the disbond significantly altered the bond-line strain distribution under such loads. The embedded sensors successfully detected this effect, and the sensor measurements compared well to FE predictions. However, the experimental measurements of the magnitude of the strain at the tips of the disbonds showed significant variations, presumably due to its high sensitivity to defect edge conditions which could not be experimentally controlled with a high degree of repeatability. Both the FE models and the experimental results showed that the effect of disbond damage was localised, more so under in-plane shear than through-thickness tension. This would necessitate the use of an optimised sensor array and pattern recognition algorithm for the reliable detection of an arbitrary disbond.
机译：本文研究了嵌入式光纤布拉格光栅应变传感器在胶粘复合船接头健康监测中的潜在应用。布拉格光栅传感器沿粘合玻璃增强塑料复合材料接头界面处的不同位置嵌入，并采用人工引入的粘合剂来评估其在面内剪切力和全厚度张力下检测粘合线损坏的能力。有限元（FE）模型表明，在这种载荷下，胶结的存在显着改变了粘结线的应变分布。嵌入式传感器成功检测到了这种影响，并且传感器的测量结果与有限元预测进行了很好的比较。然而，在脱胶尖端处的应变大小的实验测量结果显示出明显的变化，这可能是由于其对缺陷边缘条件的高度敏感性，而该缺陷边缘条件无法通过实验进行高度重复性的控制。有限元模型和实验结果均表明，剥离损伤的影响是局部的，在平面内剪切作用下比在厚度方向上的拉伸作用更明显。这将需要使用优化的传感器阵列和模式识别算法来可靠地检测任意粘结。

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