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首页> 外文期刊>International Journal of Solids and Structures >A HYBRID METHOD FOR TRANSIENT WAVE SCATTERING BY FLAWS IN COMPOSITE PLATES
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A HYBRID METHOD FOR TRANSIENT WAVE SCATTERING BY FLAWS IN COMPOSITE PLATES

机译：复合板中瞬态波散射的混合方法

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A hybrid technique is developed to analyse the plane-strain elastic wave propagation and scattering by flaws in laminated composite plates. The problem is solved first in transformed frequency domain. The incident fields due to a line load are computed through combining a stiffness method and modal summation technique. The hybrid method employed here combines finite element formulation in a bounded interior region containing all the flaws of the plate with an approximate wave modal representation for the scattered field in the exterior region. The time-domain response is recovered by Fourier inverse transformation. The results for a uniaxial graphite-epoxy plate with a line load are presented to check the accuracy of the incident field. The reliability of the proposed method is confirmed by comparing scattering results, for the uniaxial graphite-epoxy plate with surface-breaking crack, with those obtained by a boundary element technique. The study is motivated by the need to develop a quantitative ultrasonic technique to identify the integrity of the joints (interphases) between two plates. In this paper, an illustrative example, two laminated composite plates jointed together by an isotropic interphase with and without crack on the interphase, is studied in detail. It is shown that dynamic responses of the surface points near the crack are sensitive to crack length. The arrival-time-delay of the Rayleigh wave is linked directly to the crack lengths. (C) 1997 Elsevier Science Ltd. [References: 17]
机译：开发了一种混合技术来分析复合材料层压板中平面应变的弹性波传播和散射缺陷。首先在变换的频域中解决该问题。通过结合刚度法和模态求和技术来计算线荷载引起的入射场。此处采用的混合方法将有限的内部区域有限元公式组合在一起，该区域包含板的所有缺陷，并具有外部区域散射场的近似波模态表示。通过傅立叶逆变换恢复时域响应。提出了具有线载荷的单轴石墨环氧树脂板的结果，以检查入射场的准确性。通过比较具有表面破裂裂纹的单轴石墨-环氧树脂板的散射结果与通过边界元技术获得的散射结果，可以证实所提出方法的可靠性。这项研究的动机是需要开发一种定量超声技术，以识别两个板之间的接头（相间）的完整性。本文以一个说明性示例为例，详细研究了两个各向同性的层合复合板，这些层在各相之间有无裂纹。结果表明，裂纹附近表面点的动态响应对裂纹长度敏感。瑞利波的到达时间延迟与裂纹长度直接相关。 （C）1997 Elsevier Science Ltd. [引用：17]

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