The Detection of Impact Damage to the Edges of CFRP Plates Using Extensional Ultrasonic Edge Waves
The Detection of Impact Damage to the Edges of CFRP Plates Using Extensional Ultrasonic Edge Waves
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DOI：
10.1007/s10921-021-00815-4
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发表时间：
2021-10
影响因子：
2.8
通讯作者：
J. Chu;C. Courtney
中科院分区：
文献类型：
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作者：
J. Chu;C. Courtney
延伸边缘波沿着板的边缘传播，在传播方向上衰减很小，在垂直于板边缘的方向上振幅迅速减小（在一个或两个波长内）。这使它们成为检查板状结构边缘的理想选择。这里，使用有限元模型和实验来研究复合板中拉伸边缘波的传播和散射，并演示了其在损伤检测中的应用。连接到 4 毫米厚碳纤维增强聚合物 (CFRP) 板边缘的压电陶瓷换能器用于激发 140 kHz 边缘波，并使用两种实验配置演示损伤检测：一发一收和双换能器脉冲回波。在两种配置中均检测到由于 5 J 和 10 J 的边缘冲击造成的损坏。使用质量附加损伤模型来研究损伤位置的影响。检测专门针对板边缘 33 毫米（1.5 波长）内的损坏，传播不受超出该距离的特征的影响。使用边缘波群速度准确预测了脉冲回波模式下反射信号的到达时间，表明该配置可用于定位边缘损伤。边缘波的定位意味着它们可以专门检测结构边缘的损伤，并且衰减测量表明它们的有用传播距离很大（5.5 m）。
Extensional edge waves propagate along the edges of plates, with low attenuation in the propagation direction and amplitude decreasing rapidly (within one or two wavelengths) in the direction perpendicular to the plate edge. This makes them an ideal candidate for inspecting the edges of plate-like structures. Here, finite-element models and experiments are used to investigate the propagation and scattering of extensional edge waves in composite plates and application to damage detection is demonstrated. Piezoceramic transducers attached to the edge of a 4-mm-thick carbon-fibre-reinforced polymer (CFRP) plate were used to excite 140-kHz edge waves and damage detection demonstrated using two experimental configurations: pitch-catch and two-transducer pulse-echo. Damage due to edge-on impacts of 5 J and 10 J were detected in both configurations. A mass-addition damage model was used to investigate the effect of damage location. Detection was specific to damage within 33 mm (1.5 wavelengths) of the plate edge with propagation unaffected by features beyond that distance. The time of arrival of reflected signals in pulse-echo mode was accurately predicted using the edge-wave group velocity indicating that this configuration can be used for locating damage on edges. The localisation of edge waves means that they can specifically detect damage at the edges of structures, and attenuation measurements indicate that their useful propagation distance is large (5.5 m).