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
• 负责人: KITAHARA Michihiro
• 金额: $ 1.47万
• 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: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650527/
• 关键词: Interface; Crack; Ultrasonics; Nondestructive Evaluation

The results of the study are summarized as follows.1. A method to calculate the scattering amplitude was completed by the following three steps of 1) free field calculation, 2) calculation of crack-opening displacements, and 3) far-field calculation.2. A formula to evaluate the length of the interface crack was obtained by introducing the high-frequency approximation to the crack-opening displacements. From this formula, the crack length is estimated by measuring the periodicity of the scattering amplitude.3. The range of applicability was investigated for the formula obtained in the step 2. It was confirmed that the formula is applicable not only figh-frequency but low-frequency range.4. The periodicity of the scattering amplitude was measured experimentally and it was introduced into the crack estimation formula derived in the step 2. The crack length estimated by formula was in good agreement with the real crack length.

研究结果总结如下：1.通过自由场计算、裂纹张开位移计算和远场计算三个步骤完成了散射振幅的计算.通过引入裂纹张开位移的高频近似，得到了计算界面裂纹长度的公式。根据该公式，通过测量散射振幅的周期性来估计裂纹长度.研究了步骤2中获得的公式的适用范围。结果表明，该公式不仅适用于中频，而且适用于低频范围.通过实验测量了散射振幅的周期性，并将其引入步骤2中导出的裂纹估计公式中。计算结果与真实的裂纹长度吻合较好。

项目成果

Kitahara, M.: "Size estimation of interface crack by interference effect" Review of Progress in Quantitative Nondestructive. Vol.14. 155-162 (1995)

Kitahara, M.：“通过干涉效应估计界面裂纹的尺寸”定量无损进展回顾。

Kitahara, M.and Yin, J.-H.: "Elastic wave scattering by an interface crack in layred materials" Review of Progress in Quantitative Nondestructive Evaluation. Vol.15 (in press). (1996)

Kitahara, M. 和 Yin, J.-H.：“层状材料中界面裂纹引起的弹性波散射”定量无损评估进展回顾。

Kitahara,M.(他2名): "Scattering cross-sections in elastodynamics" Review of Progress in Quantitative Nondestructive Evaluation. 13. 45-52 (1994)

Kitahara, M.（和其他 2 人）：“弹性动力学中的散射截面”定量无损评估进展回顾 13. 45-52 (1994)。

Kitahara,M.and Nakagawa,K.: "Elastodynamic BEM analysis to quantify interface conditions of a compact inhomogeneity" Theory and Applications of Boundary Element Methods(International Academic Press). 237-246 (1994)

Kitahara,M. 和 Nakakawa,K.：“弹性动力学 BEM 分析来量化致密不均匀性的界面条件”边界元方法的理论和应用（国际学术出版社）。

Kitahara M.: "Siza estimation of interface crack by interference effect" Review of Progress in Quantitative Nondestractive Evaluation. 14. 155-162 (1995)

Kitahara M.：“通过干涉效应估算界面裂纹的尺寸”定量非破坏性评估进展回顾。