首页> 外文会议>Conference on Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites III; 20040316-20040317; San Diego,CA; US >A Comparison of Traditional and Emerging Ultrasonic Methods for the Nondestructive Evaluation of Polymer Matrix Composites Subjected to Impact Damage
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A Comparison of Traditional and Emerging Ultrasonic Methods for the Nondestructive Evaluation of Polymer Matrix Composites Subjected to Impact Damage

机译:传统与新兴超声方法对聚合物基复合材料冲击损伤无损评估的比较

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This paper presents the results of a comparison study of three ultrasonic nondestructive evaluation (NDE) methods applied to polymer matrix composite (PMC) specimens subjected to impact damage. Samples mainly consisted of various thicknesses of graphite/epoxy coupon panels impacted with various energy levels. Traditional pulse-echo and through transmission ultrasonic c-scan techniques were applied to impacted samples and served as the basis for comparison. Specimens were then inspected using acoustography, a large field ultrasonic inspection technique that is analogous to real-time X-ray imaging. Acoustography utilizes a unique, wide area two-dimensional (2-D) detector, called an acousto-optic (AO) sensor, to directly convert ultrasound into visual images; much like an image intensifier in real-time radiography. Finally, a newly developed guided wave scanning system was utilized to inspect the same set of samples. This system uses two transducers in a pitch catch configuration to examine the total (multi-mode) ultrasonic response in its inspection analysis. Several time- and frequency-domain parameters are calculated from the ultrasonic guided wave signal at each scan location to form images. Results are presented for all of the methods demonstrating each technique's detection capabilities and highlighting their advantages and disadvantages.
机译:本文介绍了三种超声无损评估(NDE)方法应用于聚合物基复合材料(PMC)遭受冲击破坏的方法的比较研究结果。样品主要包括各种厚度的石墨/环氧树脂试样板,它们受到不同的能级影响。将传统的脉冲回波和通过透射超声c扫描技术应用于受影响的样品,并作为比较的基础。然后使用声像图检查样本,这是一种类似于实时X射线成像的大范围超声检查技术。耳声照相术利用独特的,广域二维(2-D)检测器(称为声光(AO)传感器)将超声直接转换为可视图像。非常类似于实时射线照相中的图像增强器。最后,新开发的导波扫描系统用于检查同一组样品。该系统在俯仰捕获配置中使用两个换能器,以在检查分析中检查总的(多模式)超声响应。根据每个扫描位置的超声波导波信号计算出几个时域和频域参数,以形成图像。给出了所有方法的结果,这些方法证明了每种技术的检测能力并突出了它们的优缺点。

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