2002 Fiscal Year Final Research Report Summary
Development of quantitative low frequency ultrasonic testing and its application to nondestructive evaluation of concrete structures
| Project/Area Number |
12450182
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
構造工学・地震工学
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
HIROSE Sohichi Tokyo Institute of Technology, Graduate School of Information Science and Engineering, Professor, 大学院・情報理工学研究科, 教授 (00156712)
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| Co-Investigator(Kenkyū-buntansha) |
KITAHARA Michihiro Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (60135522)
KIMOTO Kazushi Tokyo Institute of Technology, Graduate School of Information Science and Engineering, Research Assistant, 大学院・情報理工学研究科, 助手 (30323827)
OTSUKI Nobuaki Tokyo Institute of Technology, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (40211106)
NAGATA Yasuaki Nippon Steel Corporation, Plant Eng. & Tech. Center, Senior Researcher, 技術開発本部, 主任研究員
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| Project Period (FY) |
2000 – 2002
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| Keywords | nondestructive testing / PC grouting / interface debonding / 2.5D wave analysis / fast multipole BEM / wavelet transform / L-scan method |
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| Research Abstract |
The objective of this research is the development of quantitative low frequency ultrasonic testing in the range of several 10kHz to 100kHz, in which major topics are 1. fundamental properties of low frequency ultrasonic method, 2. numerical method for low frequency ultrasonic wave method and 3. application to concrete structures.
1. Fundamental properties of low frequency ultrasonic method :
Our review of papers related to ultrasonic transducers showed that there are few works on transducers producing low frequency ultrasonic waves. It was also found that commercial transducers for ultrasonic nondestructive testing of concrete are not designed under the optimum condition based on the wave theory. Applicability of laser vibrometer to nondestructive testing for concrete was investigated.
2. Numerical method for low frequency ultrasonic testing:
A low frequency ultrasonic wave method is applied to large-scale infrastructures. In numerical simulation of the ultrasonic testing, therefore, large-scale calculation is required. To this end, we developed a 2.5-D boundary element method and a fast multipole boundary element method, both of which are effective for large-scale wave analyzes.
3. Application to concrete structures :
Low frequency ultrasonic testing was applied to the evaluation of debonding on material interface and the evaluation of PC grouting. In the evaluation of interface debonding, an L-scan method with use of leaky surface waves was demonstrated as a better method than a conventional C-scan method. In the PC grout evaluation, the wavelet transform was used for the wave analysis obtained by impact-echo method and comparison between theory and experiment was carried out.
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Research Products
(30 results)
