Development of a nonlinear acoustic microscope and evaluation of bond integrity

非线性声学显微镜的开发和粘合完整性的评估

• 批准号: 12555024
• 负责人: KAWASHIMA Koichiro
• 金额: $ 8.58万
• 依托单位: Nagoya 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: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555024/
• 关键词: Nonlinear ultrasonics; Ultrasonics; Nondestructive characterization; Higher harmonics; Internal defect; Closed crack; Bond interface; 焼結金属; 表面波; 欠陥; 接合面強度; 位相速度分散

The purpose of this project is to detect nondestructively minute micro-cracks and/or disbonding in structural materials and bonded interface by using nonlinear ultrasonic waves. The main idea is to detect higher harmonics generated at micro cracks under burst ultrasonic waves of large amplitude of a few tens of nanometers. When the surfaces of minute micro-cracks and/or disbonding are repeatedly dapped or rubbed, then higher harmonics, of which frequency are integral times of the incident wave frequency, are excited.This project is composed of the followings : (a) measurement technique of 2^<nd> harmonic without bonding piezo elements on the surfaces of materials tested, (b) elimination of nonlinearity of coupling water for immersion measurement, (c) numerical simulation of 2^<nd> harmonic wave with dynamic finite element method in which contact elements are introduced to model nearly dosed cracks or interfaces.Main results obtained by this projects are summarized in the followings.1) … More A 2^<nd> harmonic measurement system has built in terms of a burst wave of large amplitude, commercial piezo transducers, and digital signal processing. This system detects A_2/A_1, the 2^<nd> harmonic amplitude ratio normalized by the incident wave amplitude, greater than 0.4% with a resolution of 0.1%.2) In immersion measurement, a transmission technique has been developed, which exclude the acoustic nonlinearity of the coupling water. This is very effective for scanning to identify the locations of weak bonds.3) With the 2^<nd> harmonic of the leaky Rayleigh wave, depth of a dosed fatigue crack is evaluated for depth range of 1-2mm. This is particularly useful for sizing of initial fatigue cracks depth in pressure vessels.4) FEM codes for nonlinear wave propagation is developed to simulate crack surface clapping and rubbing with introducing special contact elements. With this simulation, we understand quantitative nature of harmonic generation.5) A patent on evaluation method and apparatus for bond interface evaluation is going to be submitted.6) This project is interested in some material makers, and two joint projects of nonlinear ultrasonic measurement are currently running. Less

该项目的目的是利用非线性超声波无损检测结构材料和粘合界面中的微小微裂纹和/或剥离。主要思想是检测在几十纳米大振幅的突发超声波下微裂纹处产生的高次谐波。当微小的微裂纹和/或剥离的表面被反复擦拭或摩擦时，就会激发出高次谐波，其频率是入射波频率的整数倍。该项目由以下部分组成：(a) 2次谐波的测量技术，而无需在被测材料表面粘合压电元件，(b) 消除浸没耦合水的非线性 测量，（c）采用动态有限元方法对二次谐波进行数值模拟，其中引入接触单元来模拟近封闭裂纹或界面。该项目取得的主要成果总结如下。1）… 更多 建立了一个基于大振幅突发波、商用压电传感器和数字信号处理的二次谐波测量系统。该系统检测A_2/A_1，即由入射波幅度归一化的2^<nd>谐波幅度比，大于0.4%，分辨率为0.1%。2)在浸没测量中，开发了一种传输技术，排除了耦合水的声学非线性。这对于扫描识别弱结合的位置非常有效。3)利用泄漏瑞利波的二次谐波，评估1-2mm深度范围内的剂量疲劳裂纹的深度。这对于确定压力容器中的初始疲劳裂纹深度特别有用。4) 开发了非线性波传播的 FEM 代码，通过引入特殊的接触单元来模拟裂纹表面的拍击和摩擦。通过这个模拟，我们了解了谐波产生的定量性质。5）即将提交键合界面评估评估方法和装置的专利。6）该项目引起了一些材料制造商的兴趣，目前正在运行两个非线性超声测量的联合项目。较少的

项目成果

奥村毅, 佐藤雅美, 川嶋紘一郎: "漏洩表面波の非線形を用いた閉口疲労き裂の深さ評価"平成14年度日本非破壊検査協会春季講演会. (印刷中). (2003)

Takeshi Okumura、Masami Sato、Koichiro Kawashima：“利用泄漏表面波的非线性评估闭合疲劳裂纹的深度”，日本无损检测协会 2002 年春季会议（2003 年）。

岡田,川嶋,伊藤,西村: "特異要素を用いた有限要素法による微小き裂透過波に現れる2次高調波のシミュレーション"第8回超音波による非破壊評価シンポジウム. 8. 37-42 (2001)

冈田、川岛、伊藤、西村：“使用奇异元通过有限元法模拟微裂纹透射波中出现的二阶谐波”第八届超声波无损评估研讨会（2001）。

K.Kawashima, H.Fujita, T.Shima, T.Okumura, Y.Ohara: "Detection of semi-closed cracks by nonlinear ultrasonics"Proceedings of the 6-th Far-East Conference on Non-Destructive Testing. 201-206 (2002)

K.Kawashima、H.Fujita、T.Shima、T.Okumura、Y.Ohara：“非线性超声波检测半封闭裂纹”第六届远东无损检测会议论文集。

K. Kawashima, J. Okada, N. Nishimura: "Internal microcrack detection with nonlinear ultrasonic waves"Jpn. J. Appl. Phys. 40/5. 3579-3582 (2001)

K. Kawashima、J. Okada、N. Nishimura：“用非线性超声波检测内部微裂纹”Jpn。

K.Kawashima, et al.: "Evaluation of minute cracks generated by spallation with nonlinear ultrasonic measurement"Proceedings of 8^<th> International Symposium of Modern Acoustics. (in press). (2001)

K.Kawashima等人：“利用非线性超声波测量对散裂产生的微小裂纹进行评估”第8届国际现代声学研讨会论文集。