1981 Fiscal Year Final Research Report Summary
Study of Non-Destructive Stress Measurements Using Acousto-elasticity
| Project/Area Number |
X00120----585133
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
土木構造
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| Research Institution | Kyoto University |
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Principal Investigator |
KOBAYASHI Shoichi Kyoto Univ. Faculty of Eng. Professor, 工学部, 教授 (90025908)
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| Project Period (FY) |
1980 – 1981
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| Keywords | Acoustoelasticity / Sing-around unit / Time-of-flight measurement / Surface wave / Longitudinal wave / Acoustoelastic coefficient / Aluminum alloys / Structural steel |
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| Research Abstract |
The objective of this research is to investigate the possibility and to provide a foundation for non-destructive stress measurements by use of the acousto-elasticity technique. The results are summarized as follows :
A) On the utilization of the surface (Rayleigh) wave.
1) We set up two types of measuring system with precision of time a) 0.2nano second by improving a commercial sing-around unit (syatem A) and b) 0.05nano second by time-of-flight measurement (system B).
2) We made the transmitters and receivers of a) knife-edge type and b) wedge-type and tested.
3) We investigated the effect of stresses on the variation of the phase- speed of surface waves for Alminum alloys (5152 and 2017) by the tension and the bending tests.
4) The variation of the phase spied of surface waves was found to be proportional to stress. The stress-acousto-elastic coefficients are measured for the Aluminum alloys.
B) On the utilization of the longitudinal wave.
1) We set up a system with precision of 0.05nsec using a commercial sing-around unit.
2) We made use of a commercial transmitter and receiver and one of domestic made and tested.
3) We investigated the effect of stresses on the variation of the phase speed of longitudinal waves for Alminum alloys (5152 and 2017) and structural steel by the tension tests.
4) The variation of the phase speed of longitudinal waves was found to be proportional to stress. The stress-acoustoelastic coefficients are determined for the Aluminum alloys and the steel. From this research. we clarified foundamentals of non-destructive stress measurements and illuminated the applicability and usefulness of the technique.
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