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The precise determination of the elastic constants of solids by ultrasonic means
Başlık:
The precise determination of the elastic constants of solids by ultrasonic means
Yazar:
Alton, William J., author.
ISBN:
9780438052710
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (246 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 76-08C.
Advisors: A. J. Barlow.
Özet:
A method has been developed for the precise measurement of the velocity of ultrasonic waves in small solid specimens, which may have dimensions as small as 3 mm. This is based on the use of a phase comparison technique, in which pulses of ultrasound, reflecting to and fro within the specimen, are made to overlap with each other. Critical adjustment of the frequency of operation enables the interfering parts of the wavetrain to be maximized, when, from a knowledge of the dimensions of the specimen, and the frequency of operation, the velocity may be obtained. The specimens investigated have been in the form of single crystals. Suitable choice in the directions of propagation, and the meaasurement of both longitudinal and shear wave velocities in these specimens, enables the elastic constants of the material to be evaluated. The effect of the acoustic bond through which the waves are introduced to the specimen is of importance. An analysis has been made of the possible bond errors which may occur, particularly when measurements are made over an appreciable temperature range. The measurements of velocity are made around 210 & 230 Mc/s to enable the integral number of wavelengths in the specimen to be obtained without ambiguity. Due to the large number of wavelengths (approx. 500) in the specimen, the measurements are relatively insensitive to bond effects. The technique developed is estimated to give velocities accurate to within +/- 0.004%R.M.S error. To calculate the elastic constants from the measured velocities and the density of the specimen, allowance must be made for possible crystallographic misorientation, and the elastic constants obtained are estimated to be within - 0.05% under favourable conditions. A full analysis is contained of the possible errors arising from frequency measurement, specimen thickness, acoustic bonds, temperature, and crystal misorientation.
Notlar:
School code: 0547
Tüzel Kişi Ek Girişi:
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(684417.1) | 684417-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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