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首页> 外文期刊>International Journal of Solids and Structures >Ultrasonic waves in layered anisotropic media: characterization of multidirectional composites
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Ultrasonic waves in layered anisotropic media: characterization of multidirectional composites

机译：层状各向异性介质中的超声波：多向复合材料的表征

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摘要

An efficient and stable recursive compliance/stiffness matrix algorithm is presented to model wave propagation in multidirectional composites. The models are applied to clarify angle beam transmission through a multidirectional composite and to process ultrasonic data for determination of the elastic properties of a composite lamina (single ply) from measurements on a multidirectional composite. Ultrasonic characterization of composites using double-through-transmission and time-resolved line focus acoustic microscopy has been addressed. The double-through-transmission measurements and simulations show that the transmission amplitude is highly dependent on ply orientation and angle of incidence. The transmission amplitude decreases rapidly with incident angle deviation from the normal; however, a transmission window is found in the incident angle range 45-60degrees at frequencies below 2.25 MHz. The time-delay measurements by the double-through-transmission technique have been used to reconstruct lamina properties using the Floquet wave concept. A unidirectional lamina elastic properties measurement using line focus acoustic microscopy of a multidirectional composite sample is also briefly discussed. The effective elastic properties for the composites are determined from the lamina properties by a Floquet wave dynamic homogenization method. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 53]
机译：提出了一种高效稳定的递归柔度/刚度矩阵算法，对多向复合材料中的波传播进行建模。该模型用于阐明通过多向复合材料的角射束传输，并处理超声数据，以便根据对多向复合材料的测量来确定复合材料薄片（单层）的弹性性能。已经解决了使用双穿透透射和时间分辨线聚焦声学显微镜对复合材料进行超声表征的问题。两次通过传输的测量和模拟表明，传输幅度高度取决于层的方向和入射角。透射幅度随着入射角偏离法线而迅速减小。但是，在低于2.25 MHz的频率处，入射角范围为45-60度时发现有透射窗。通过双传输技术的时延测量已被用于使用Floquet波概念来重建薄片特性。还简要讨论了使用线聚焦声显微镜对多向复合材料样品进行的单向薄片弹性性能测量。复合材料的有效弹性性能是通过Floquet波动态均质化方法根据层板性能确定的。 （C）2002 Elsevier ScienceLtd。保留所有权利。 [参考：53]

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