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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >ACOUSTO-ULTRASONIC EVALUATION OF HYBRID COMPOSITES USING OBLIQUE INCIDENCE WAVES
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ACOUSTO-ULTRASONIC EVALUATION OF HYBRID COMPOSITES USING OBLIQUE INCIDENCE WAVES

机译：斜入射波在超声复合材料中的超声评估

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摘要

The proposed technique utilizes oblique incidence ultrasonic waves to detect delaminations in multi-layered composite plate. The oblique incidence ultrasonic wave technique is based on the wave mode conversion phenomena. Since a delamination layer has different material properties from the normal bonding layer, and usually has much lower shear strength compared to the normal bonding material, the amounts of energy in the longitudinal wave and the shear wave reflected from these two layers are also different. At some angles (especially close to the first critical angle) this difference is significant as shown in Figure 2. The multi-transducer probe and multi-channel pulser/receiver system are used to: (a) send signals into the plate: and (b) receive signals from the plate. Since the signal received from the plate contains large amounts of information about the plate, it is preferable to perform digital signal processing (DSP) to extract the desired information. The data acquisition board used in this study is PAC-AEDSP-32/16 card with sophisticated waveform collection and real-time signal processing capability, which will enable the system to collect waveforms and extract features in real time.
机译：所提出的技术利用倾斜入射超声波来检测多层复合板中的分层。倾斜入射超声波技术基于波模式转换现象。由于分层层具有与常规粘结层不同的材料特性，并且与常规粘结层相比通常具有低得多的剪切强度，因此从这两个层反射的纵波和剪切波中的能量也不同。如图2所示，在某些角度（尤其是接近第一个临界角），这种差异非常明显。多传感器探头和多通道脉冲发生器/接收器系统用于：（a）将信号发送到板上：和（ b）从印版接收信号。由于从平板接收的信号包含有关平板的大量信息，因此最好执行数字信号处理（DSP）以提取所需的信息。本研究中使用的数据采集板是具有复杂波形采集和实时信号处理功能的PAC-AEDSP-32 / 16卡，它将使系统能够实时采集波形并提取特征。

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