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Detection of core-skin disbonds in honeycomb composite sandwich structures using highly nonlinear solitary waves

机译：使用高度非线性孤立波检测蜂窝复合夹层结构中的核心皮肤脱屑

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摘要

We study experimentally the feasibility of using a solitary wave-based diagnostic scheme for the detection of core-skin disbonds in composite sandwich structures comprising of carbon-fiber/epoxy skins and a NomexTM honeycomb core. Non-destructive tests are conducted using a vertically aligned granular chain of steel beads placed in direct contact with the skin of the sandwich panel containing core-skin disbonds of various sizes. The incident and reflected nonlinear pulses are recorded at a single location in the chain via an embedded piezoelectric sensor, and the effects of disbond size and skin thickness on the delay and amplitude of the reflected solitary waves are studied. The results show that the existence of a core-skin disbond significantly increases the delay in the formation of reflected solitary waves as compared to the measurements obtained for a pristine panel, and this difference increases with decreasing skin thickness. The proposed method is capable of detecting defects of 4.9 cm(2) area or larger in a sandwich panel with skins as thick as 1.2 mm, while disbonds of 1.8 or 3.1 cm(2) area can only be clearly identified for skin thicknesses up to 0.8 mm. The obtained results demonstrate that the solitary wave-based diagnostic scheme is effective in detecting core-skin disbonds in honeycomb composite sandwich panels, offering a reliable and cost-effective alternative to existing nondestructive test methods.
机译：我们研究了使用孤立波基诊断方案的可行性，用于检测组合夹层结构中的核心皮肤脱屑，其包含碳纤维/环氧树脂和Nomextm蜂窝核心。使用垂直对准的钢珠粒进行非破坏性测试，该钢珠粒与夹心板的皮肤直接接触，含有各种尺寸的核心皮肤脱屑。通过嵌入式压电传感器在链中的单个位置记录入射和反射的非线性脉冲，研究了抵碎尺寸和皮肤厚度对反射孤立波的延迟和幅度的影响。结果表明，与原始面板获得的测量相比，核心皮肤的存在显着增加了反射孤立波的形成的延迟，并且这种差异随着皮肤厚度的降低而增加。所提出的方法能够在夹心板中检测4.9cm（2）个面积或更大的缺陷，其皮肤与1.2mm厚，只有1.8或3.1cm（2）个区域的禁用只能清楚地识别出皮肤厚度0.8毫米。所得结果表明，孤立的波基诊断方案有效地检测蜂窝复合夹层板中的核心皮肤脱位，为现有的非破坏性测试方法提供可靠且经济效益的替代方案。

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