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A new method for measuring the structure and strength of anisotropic composite material using ultrasonic waves

超声波测量各向异性复合材料结构和强度的新方法

基本信息

批准号：
08455309
负责人：
UEHA Sadayuki
金额：
$ 1.22万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

Since ultrasonic wave is a mechanical vibration, the ultrasonic responses propagating through a material can be used to characterize its mechanical and structural properties. The spatial analysis of ultrasonic propagation gives the structural information of the material. The measurement of sound velocity decides the elastic constants. However, the ultrasonic signal passed through anisotropic material with micro structure generally deforms and is complicate compared to the incident wave. It makes the analysis quite difficult.In this study, the behavior of ultrasonic wave in anisotropic material is analyzed. The procedure to measure the strength of anisotropic material and obtain the constructive information is proposed.First, the ultrasonic wave propagated through a simplified model is used to find its sound field. This model is consisted of a series of parallel cylinders with a constant interval and diameter. The radiated wave scatters on the surface of cylinders and the scattered wave … More s become secondary incident waves to other cylinders. The resulting sound field is calculated by the function of multi-path propagation among the cylinders. The experiment is performed by using a one-axis anisotropic material made from acrylic cylinders with 2 mm to 3 mm diameter and 2.5 mm to 7 mm interval. When the interval of the neighboring cylinders is larger than twice of the wavelength, the experimental results and theoretical results are agreed.Then, the spatial parameters of the one-axis anisotropic material are predicted. Using 2-dimension diffraction grating model, the scattered sound field is analyzed in frequency domain. The comparison of the scattered waves received in many directions gives the diameter and interval of the cylinders in the material. The calculated values are coincident with the experimental values. The estimation of diameter and interval of the cylinder is required as a medical diagnosing method.While rotating the anisotropic material, the received wave is detected. When the direction of cylinder in the anisotropic material coincides with the incident direction of ultrasonic wave, the received signals vary largely as a function of the scattering angle. This property is useful to detect the direction of anisotropic material. Less

由于超声波是一种机械振动，通过材料传播的超声响应可以用来表征其机械和结构性能。超声传播的空间分析给出了材料的结构信息。声速的测量决定了弹性常数。然而，超声信号通过具有微结构的各向异性材料时，通常会发生形变，与入射波相比，其波形复杂。在本研究中，我们分析超音波在各向异性材料中的行为。提出了一种测量各向异性材料强度并获取其结构信息的方法：首先，利用超声波在简化模型中传播的声场来求取模型的声场;该模型是由一系列平行的圆柱体组成的，圆柱体的间距和直径都是恒定的。辐射波在圆柱体表面的散射， ...更多信息 s成为其他圆柱体的二次入射波。由此产生的声场计算的多路径传播的功能之间的圆柱。实验是通过使用由直径为2 mm至3 mm、间距为2.5 mm至7 mm的丙烯酸圆柱体制成的单轴各向异性材料来进行的。当相邻圆柱体的间距大于两倍波长时，实验结果与理论结果一致，进而预测了单轴各向异性材料的空间参数。采用二维衍射光栅模型，对散射声场进行频域分析。比较在多个方向上接收到的散射波给出了材料中圆柱体的直径和间隔。计算值与实验值吻合较好。在医学诊断中，需要对圆柱体的直径和间距进行估计。在旋转各向异性材料的同时，检测接收到的波。当各向异性材料中的圆柱方向与超声波入射方向一致时，接收信号随散射角的变化有很大的变化。此属性对于检测各向异性材料的方向非常有用。少