Ultrasonic Inspection with Partial Wave Decomposition for Damage Evaluation

用于损伤评估的分波分解超声波检测

• 批准号: 02650327
• 负责人: KITAHARA Michihiro
• 金额: $ 1.28万
• 依托单位: Tokai University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650327/
• 关键词: Ultrasonic Inspection; Partial Wave Decomposition; Phase Shift; Reliability of Damage Evaluation; Quantitative Nondestructive Evaluation; 超音波診断法; 損傷評価; 非破壊評価の信頼性

A strategy of partial wave decomposition was introduced for an ultrasonic damage evaluation in a structural component. The study is based on the three dimensional wave theory and has three steps. The integral representation of the scattered field from defects was advantageously utilized and the boundary integral equation method was used for the numerical calculations in every step.1. Integral Representation for Phase Shifts of the Scattered FieldThe relations of scattering amplitude, scattering cross-section, and phase shift of the scattered field were made clear for an arbitrary shape of scatters in an acoustic medium. The integral representations for these three physical quantities were explicitly written down with the help of an integral representation of the scattered field. They are expressed by the shape of scatterer, wave number of the incident wave, boundary condition of the scatterer. The numerical calculation was performed for phase shifts to understand the general tendency o … More f phase shifts for several shapes of scatterers.2. Extension to Elastodynamics and Elastodynamic Scattering Cross-SectionIt was shown that the same relations are formally true for an elastodynamic counterpart. Since there are explicit relations among scattering amplitude, scattering cross-section, and phase shift, the scattering cross-section was selected to quantify for the elastodynamic scattered field. The integral representation of the elastodynamic scattering cross-section was formulated over the surface of the defects. The scattering cross-section is related to the shape of defects, wave number of the incident wave, boundary mechanism of defects, and material property of defects.3. Shape Recognition from Phase Shifts of Partial WavesAn inverse method was proposed for the shape recognition of defects. The method is based on the integral representation of phase shifts of the scattered field from defects. Several shapes of defects were reconstructed numerically for three dimensional scatterers by giving the phase. shifts at the far-field. Less

提出了一种基于分波分解的结构超声损伤评估方法。研究以三维波动理论为基础，分三个步骤进行。利用了缺陷散射场的积分表示，并采用边界积分方程法进行了每一步的数值计算.散射场相移的积分表示对于声介质中任意形状的散射体，明确了散射振幅、散射截面和散射场相移之间的关系。这三个物理量的积分表示在散射场的积分表示的帮助下被明确地写下来。它们用散射体的形状、入射波的波数、散射体的边界条件来表示。对相移进行了数值计算，以了解相移的一般趋势。 ...更多信息 f相移的几种形状的散射。对弹性动力学和弹性动力散射截面的扩展它表明，同样的关系式在形式上对弹性动力学对应物也是正确的。由于散射振幅、散射截面和相移之间存在显式关系，因此选择散射截面来量化弹性动力学散射场。建立了缺陷表面弹性动力学散射截面的积分表达式。散射截面与缺陷的形状、入射波的波数、缺陷的边界机制以及缺陷的材料性质有关.提出了一种缺陷形状识别的逆方法。该方法是基于从缺陷的散射场的相移的积分表示。给出了三维散射体中缺陷的相位，数值重构了缺陷的几种形状。在远场移动少

项目成果

Kitahara,M.: "Transient elastodynamic analysis for three dimensional configulations" Developments in Boundary Element Methods (Eds.P.K.Banerjee and S.Kobayashi,Elsevier Applied Science). 7. (1992)

Kitahara,M.：“三维配置的瞬态弹性动力学分析”边界元方法的发展（Eds.P.K.Banerjee 和 S.Kobayashi，爱思唯尔应用科学）。

北原 道弘: "散乱波動場における位相情報の定量化と実験" 土木工学における非破壊評価シンポジウム講演論文集(土木学会構造工学委員会). 73-80 (1991)

Michihiro Kitahara：“散射波场中相位信息的量化和实验”土木工程无损评估研讨会论文集（日本土木工程师学会结构工程委员会）73-80（1991）。

Kitahara,M.: "Phase shift determination of scattered far-fields and its application to an inverse problem" Review of Progress in Quantitative Nondestructive Evaluation (Eds.D.O.Thompson and D.E.Chimenti,Plenum Press). 11A. (1992)

Kitahara,M.：“分散远场的相移测定及其在反问题中的应用”定量无损评估进展回顾（Eds.D.O.Thompson 和 D.E.Chimenti，Plenum Press）。

Kitahara, M.: "Phase shift analysis and nondestructive evaluation (in Japanese)" Computational Mechanics [III] (Eds. Yagawa, G. and Tosaka, N.). 168-182 (1992)

Kitahara, M.：“相移分析和无损评估（日语）”计算力学 [III]（Yakawa, G. 和 Tosaka, N. 编辑）。