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Identification of crack and disbond fronts in repaired aircraft structural panels with bonded FRP composite patches

机译：用粘合的FRP复合材料补丁识别修复的飞机结构面板中的裂纹和脱胶锋面

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Structural health monitoring of fatigue-cracked aircraft structural panels repaired with bonded FRP composite patches for extending the service life of aging aircraft has received wide attention. In this paper a method for identifying the locations and shapes of crack and disbond fronts in aircraft structural panels repaired with bonded FRP composite patches is presented. The identification is performed by minimizing the residual norm between the measured in-plane strain range on a strain measurement plane in the FRP composite patches and the calculated in-plane strain range. Several numerical examples of identification of the locations and shapes of crack and disbond fronts are examined. The effects of the number of strain measurement points, position of the strain measurement plane, and measurement errors of the in-plane strain ranges on the identification results are discussed. The validity of this identification method is verified by comparing the identification results with the exact ones.
机译：疲劳断裂的飞机结构板的结构健康监测已经得到了广泛的关注，这种疲劳裂纹的飞机结构板用粘合的FRP复合材料修补片修复，以延长老化的飞机的使用寿命。本文提出了一种方法，该方法用于识别用粘结的FRP复合材料修补物修复的飞机结构板中的裂纹和脱胶锋面的位置和形状。通过最小化FRP复合材料贴片中的应变测量面上的面内应变范围和计算出的面内应变范围之间的残留范数来进行识别。检验了几个数值实例，以确定裂纹和脱粘锋面的位置和形状。讨论了应变测量点数量，应变测量平面的位置以及面内应变范围的测量误差对识别结果的影响。通过将识别结果与精确结果进行比较，验证了该识别方法的有效性。

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