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首页> 外文期刊>Journal of Engineering Mechanics >Ultrasonic characterization and inspection of open cell foams
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Ultrasonic characterization and inspection of open cell foams

机译：开孔泡沫的超声波表征和检查

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摘要

The nondestructive characterization of the material properties and the detection of hidden discontinuities in a highly porous, open cell, carbon foam using ultrasonics are presented. The propagation of ultrasonic waves in carbon foam specimens and their relationship with the elastic properties of the material are studied through theoretical modeling and laboratory experiments. The geometric and the overall elastic properties of the material are determined from microscopic data and wave propagation experiments performed under dry and fluid coupling conditions. A broadband, hybrid system based on laser generation and air-coupled detection of ultrasound is first employed for primary wave (P-wave) characterization. Significant discontinuities within the specimen are then detected using a narrowband, air-coupled ultrasonic setup as well as an automated fluid-coupled real-time intelligent ultrasonic setup. The use of the discrete wavelet transform is investigated as an effective tool for signal denoising in air-coupled ultrasonic probing of the foams. A simple, one-dimensional model, based on a periodic spring-mass system and a previously developed homogenization theory, is used to predict the wave speed.
机译：提出了使用超声波对材料特性进行无损表征以及在高度多孔的开孔碳泡沫中检测隐藏的不连续性。通过理论建模和实验室实验研究了碳泡沫样品中超声波的传播及其与材料弹性性能的关系。材料的几何和整体弹性是根据在干燥和流体耦合条件下进行的微观数据和波传播实验确定的。首先将基于激光产生和超声空气耦合检测的宽带混合系统用于一次波（P波）表征。然后使用窄带，空气耦合超声设置以及自动流体耦合实时智能超声设置检测样本中的显着不连续性。离散小波变换的使用被研究为泡沫空气耦合超声探测中信号降噪的有效工具。一个简单的一维模型基于周期性的弹簧质量系统和先前开发的均质化理论，用于预测波速。

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