Damage Evaluation of Structural Components by Ultrasonic Attenuation

通过超声波衰减对结构部件进行损伤评估

基本信息

项目摘要

The results of the study are summarized as follows.1.The boundary integral equation to determine crack opening displacements was formulated for scattering problems of a crack in three dimensional elastic solids. The quarter point elements were introduced for the crack tip and the regularization was performed for the hyper singular kernel of the boundary integral equation.2.Far-field expressions of longitudinal and transverse scattering amplitudes were obtained from the three-dimensional elastodynamic Green's function. Then the expression of elastodynamic scattering cross-sections was formulated from the far-field scattering amplitudes.3.The angular distributions of differential scattering cross-sections were numerically calculated and the frequency characteristics of the elastodynamic scattering cross-section were investigated. It was found that the longitudinal part of the differential scattering cross-section is localized to the propagation direction of the incident wave when the frequency increases. The total scattering cross section has a peak when the wavelength of the incident wave becomes the order of crack diameter.4.The relation of elastodynamic scattering cross-section, attenuation and crack density was obtained from the assumption of the dilute distribution of cracks in structural components. It was proposed to estimate the crack density by measuring the attenuation in damaged components.
主要研究结果如下:1.针对三维弹性体中裂纹的散射问题,建立了确定裂纹张开位移的边界积分方程。在裂纹尖端引入四分之一点单元,并对边界积分方程的超奇异核进行正则化。2.由三维弹性动力学绿色函数得到了纵向和横向散射振幅的远场表达式。由远场散射振幅推导出了弹性动力学散射截面的表达式。3.数值计算了微分散射截面的角分布,研究了弹性动力学散射截面的频率特性。研究发现,当频率增加时,微分散射截面的纵向部分局部化于入射波的传播方向。当入射波的波长为裂纹直径的数量级时,总散射截面出现一个峰值。4.在裂纹稀疏分布的假设下,得到了结构件弹性动力学散射截面、衰减与裂纹密度的关系。提出了通过测量损伤构件中的衰减来估计裂纹密度的方法。

项目成果

期刊论文数量(14)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Kitahara, M.and Nakagawa, K.: "Differential and scattering cross-sections for cracks in 3D elastic solids" Boundary Element Methods, Elsevier Science B.V.37-46 (1996)
Kitahara, M. 和 Nakakawa, K.:“3D 弹性固体中裂纹的微分和散射截面”边界元方法,Elsevier Science B.V.37-46 (1996)
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Kitahara, M.and Nakagawa, K.: "Elastodynamic optical theorem for the evaluation of scattering cross-sections for a crack" Review of Progress in Quantitative Nondestructive Evaluation. Vol.16. 27-34 (1997)
Kitahara, M. 和 Nakakawa, K.:“用于评估裂纹散射截面的弹性动力学光学定理”定量无损评估进展回顾。
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北原 道弘: "欠陥の定量化と波動解析" 電子情報通信学会技術研究報告. US96-63. 1-8 (1996)
Michihiro Kitahara:“缺陷量化和波分析”IEICE 技术研究报告 US96-63 (1996)。
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Kitahara, M.and Nakagawa, K.: "Multiple scattering calculations by Born series integral equations" Review of Progress in Quantitative Nondestructive Evaluation. Vol.17, (in press). (1998)
Kitahara, M. 和 Nakakawa, K.:“玻恩级数积分方程的多重散射计算”定量无损评估进展回顾。
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KITAHARA Michihiro其他文献

KITAHARA Michihiro的其他文献

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{{ truncateString('KITAHARA Michihiro', 18)}}的其他基金

Quantitative Evaluation of Structural Damage by Attenuation in Scattering
通过散射衰减定量评估结构损伤
  • 批准号:
    10650458
  • 财政年份:
    1998
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Quantitative Evaluation of Interface Cracks by Interference Effect
通过干涉效应定量评价界面裂纹
  • 批准号:
    06650527
  • 财政年份:
    1994
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Ultrasonic Attenuation Method for the Evaluation of Damage
用于评估损伤的超声波衰减法
  • 批准号:
    04650411
  • 财政年份:
    1992
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Development of ultrasonic knowledge base for evaluation of interface damage
界面损伤评估超声知识库的开发
  • 批准号:
    03555104
  • 财政年份:
    1991
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
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
  • 财政年份:
    1990
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Development of Ultrasonic Knowledge Base for Quantitative Nondestructive Evaluation
定量无损评估超声知识库的开发
  • 批准号:
    01850105
  • 财政年份:
    1989
  • 资助金额:
    $ 1.28万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B).

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SBIR 第一阶段:用于牡蛎礁恢复和小型码头保护的波浪衰减技术
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    2888992
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    23H01366
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