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- W2076056019 abstract "Abstract When an ultrasonic wave passes through a block of metal, the wave is attenuated, i.e. its amplitude decreases with distance. The principal cause of this attenuation is believed to be scattering of the wave at the grain boundaries. Since neighbouring grains will in general have different crystallographic orientations and the velocity of sound depends on the orientation, a proportion of the wave will be lost due to reflection and mode conversion at each grain boundary. This problem was first tackled by Lifshitz and Parkhomovski [1], who considered the problem of a cast material which has equiaxed grains with no preferred orientation. They also assumed that the anisotropy within a single grain is small and they obtained expressions for the attenuation of longitudinal and shear waves. Their results have subsequently been shown to be a useful approximation even for the case of steels where the anisotropy within a grain is not small. Many metals which have been worked in some way, e.g. forging or welding, exhibit a textured structure in which the grains may on average be elongated in a particular direction or there may be a preferred crystallographic orientation, or both. In this case the bulk metal will no longer be isotropic, and the results of Lifshitz and Parkhomovski will not apply. In this paper we show how the approach used by Lifshitz and Parkhomovski may be modified to tackle such problems. General results for the attenuation are presented in terms of averages over the particular distribution of orientations. Detailed results are presented for a particular distribution which is a representation of austenitic weld metal." @default.
- W2076056019 created "2016-06-24" @default.
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- W2076056019 date "1985-01-01" @default.
- W2076056019 modified "2023-09-25" @default.
- W2076056019 title "The propagation of elastic waves through a textured granular material" @default.
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- W2076056019 doi "https://doi.org/10.1016/0020-7225(85)90125-9" @default.
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