| 書目名稱 | Review of Progress in Quantitative Nondestructive Evaluation | | 副標(biāo)題 | Volume 7B | | 編輯 | Donald O. Thompson,Dale E. Chimenti | | 視頻video | http://file.papertrans.cn/830/829437/829437.mp4 | | 叢書名稱 | Review of Progress in Quantitative Nondestructive Evaluation | | 圖書封面 |  | | 描述 | It has been shown both experimentally {2} and theoretically {2,3} that surface skimming SH waves propagating along symmetry axes of the texture have velocities that differ in proportion to the magnitude of any stress that lies along one of the symmetry axes. Specifically, the stress is directly proportional to the relative velocity difference through the equation -,--V ik=---V. -=ki) ( I) cr. = 2G (-V ~ ik where cr. is the stress in the direction i, G is the shear modulus and Vik is the ~elocity of an SH wave propagating in the i direction and polarized in the k direction. This rather simple relationship is particularly useful because the constant of proportionality involves only the well known shear modulus and the velocity term can be measured directly by observing the transit time shift when a transmitter-receiver pair of SH wave transducers are rotated through 90 degrees on the surface of the part. Experimentally, Equation (I) was tested on the web of railroad rails which had been loaded by a 200,000 pound mechanical testing machine {I}. The method of exciting and detecting the necessary surface skimming SH waves used electromagnetic acoustic transducers (EMATs) that operated t | | 出版日期 | Book 1988 | | 關(guān)鍵詞 | X-ray; ceramics; composite material; crystal; deformation; fatigue; glass; metals; microscopy; non-destructiv | | 版次 | 1 | | doi | https://doi.org/10.1007/978-1-4613-0979-6 | | isbn_softcover | 978-1-4612-8275-4 | | isbn_ebook | 978-1-4613-0979-6 | | copyright | Plenum Press, New York 1988 |
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