Anisotropy Detection in Small Area of Materials using Surface Acoustic Waves : Basic Research on Utilization of Ultrasonic Reflectivity Measurement for Estimating Elastic Anisotropy
An ultrasonic reflectivity measurement technique is applied to anisotropy detection within a small area of material. The ultrasonic reflectivity is microscopically measured using an ultrasonic microspectrometer with spherical-planar-pair lenses. The acoustic reflection coefficients of small area on...
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Published in | Transactions of the Japan Society of Mechanical Engineers Series A Vol. 61; no. 584; pp. 769 - 776 |
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Main Authors | , , , |
Format | Journal Article |
Language | Japanese |
Published |
The Japan Society of Mechanical Engineers
1995
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Subjects | |
Online Access | Get full text |
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Summary: | An ultrasonic reflectivity measurement technique is applied to anisotropy detection within a small area of material. The ultrasonic reflectivity is microscopically measured using an ultrasonic microspectrometer with spherical-planar-pair lenses. The acoustic reflection coefficients of small area on a water-cubic (111) interface were measured for an incident wave at an angle θ to the normal and φ to some direction lying in the (111) surface. The reflection coefficients measured as a function of θ and φ were in good agreement with the theoretical calculation. This reveals that the microscopically measured reflection coefficient is reasonable and can be used as a promising detector of anisotropy in a small area. Furthermore, a mean reflection coefficient is defined for quantitative evaluation of elastic anisoropy in a small area of polycrystalline materials. It has been confirmed that, by performing numerical and experimental examinations with texture-controlled steels, the reflection coefficient measured in polycrystalline materials corresponds to the mean reflection coefficient. |
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ISSN: | 0387-5008 1884-8338 |
DOI: | 10.1299/kikaia.61.769 |