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首页> 外文会议>Conference on Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems >Fundamental ultrasonic wave propagation studies in a model thermal protection system (porous tiles bonded to aluminum bulkhead)
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Fundamental ultrasonic wave propagation studies in a model thermal protection system (porous tiles bonded to aluminum bulkhead)

机译：模型热保护系统中的基本超声波传播研究（多孔瓷砖粘合到铝舱壁）

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A model thermal protection system (TPS) was designed by bonding ceramic porous tiles to 2.2 and 3.5 mm thick 2124-T351 aluminum alloy plates. One of the goals of the present work was to investigate the potential of detecting simulated defects using guided waves. Simulated defects consisted of cracks, voids and delaminations at the tile-substrate interface. Cracks and voids were introduced into the porous tiles during the fabrication of the TPS. Delamination was created by cutting the gluing tape between the tile and the aluminum substrate. Guided wave propagation studies were conducted using the pitch-catch approach, while changing the angle of strike and the frequency of the transducer excitation to generate the appropriate guided wave mode. The receiver was placed at a distance so that only the guided waves were received during the immersion experiment. The delamination defect could be conclusively detected, however the presence of the imperfect bond between the tiles and the substrate interfered with the detection of the simulated cracks and voids in the porous tiles.
机译：通过将陶瓷多孔瓷砖粘合至2.2和3.5mm厚的2124-T351铝合金板，设计了模型热保护系统（TPS）。本作工作的目标之一是调查使用引导波检测模拟缺陷的可能性。模拟缺陷由瓦片底板界面处的裂缝，空隙和分层组成。在制造TPS期间将裂缝和空隙引入多孔瓦片。通过切割瓷砖和铝基板之间的胶带来产生分层。使用间距接近进行引导波传播研究，同时改变击球角度和换能器激励的频率以产生适当的引导波模式。将接收器放置在距离处，以便在浸没试验期间仅接收引导波。可以确定地检测分层缺陷，但是在瓦片和基板之间存在不完全粘合的存在干扰了多孔瓦片中的模拟裂缝和空隙的检测。

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