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Boundary element analysis of stiffened panels with repair patches

机译：带有修补片的加劲板的边界元分析

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摘要

In this paper a boundary element method for analysis of fractured stiffened panels repaired with riveted or adhesively bonded patches is presented. In order to achieve such a formulation, several boundary element formulations involving the membrane and bending of displacement, and, stress resultants are coupled together to analyse the model. The multi-region formulation is used to simulate the stiffeners, which are modelled as an assembly. They are then connected to the sheets to form the stiffened panels by means of a rivet formulation. The dual boundary element method is used to simulate the presence of cracks, and the patches, treated as independent plates, are joined to the panel either with rivets or adhesive. A boundary element formulation for adhesive bonding is implemented to model the adhesively bonded patches. The Crack Opening Displacements (COD) method and the J-integral are implemented to evaluate the required fracture parameters. Examples presented include a wing box with a three spar section, with fully stiffened skin, and, the skin is considered to have a crack and a repair patch is used on top of the crack to stop its growth.
机译：在本文中，提出了一种边界单元方法，用于分析用铆钉或粘合剂粘结的补片修复的断裂加劲板。为了实现这种公式化，将涉及膜和位移弯曲以及应力合力的几种边界元素公式耦合在一起以分析模型。多区域公式用于模拟加劲肋，加劲肋被建模为装配体。然后通过铆钉将它们连接到薄板上以形成加强板。双边界元法用于模拟裂纹的存在，将作为独立板处理的贴片通过铆钉或粘合剂连接到面板上。实施用于粘合剂粘合的边界元素配方以对粘合剂粘合的贴剂进行建模。实施裂缝开口位移（COD）方法和J积分来评估所需的断裂参数。呈现的示例包括具有三个翼梁部分的翼盒，蒙皮完全硬化，并且蒙皮被视为存在裂缝，并且在裂缝顶部使用了修补膜以阻止其生长。

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