Errata: Energy Losses of Sound Waves in Metals due to Scattering and Diffusion
Errata: Energy Losses of Sound Waves in Metals due to Scattering and Diffusion
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勘误表：金属中声波由于散射和扩散而造成的能量损失
DOI：
10.1063/1.1698343
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发表时间：
1948
影响因子：
3.2
通讯作者：
H. J. Mcskimin
中科院分区：
文献类型：
--
作者：
W. P. Mason;H. J. Mcskimin
当高频纵向和横向声波通过多晶金属棒发送时，由于晶粒对声波的散射和扩散而导致衰减损耗。当晶粒尺寸小于波长的三分之一时，这些损耗是由于瑞利四次幂定律散射引起的，并且与晶粒体积成比例。散射因子取决于弹性常数的各向异性。得到两个不同的因子，一个用于横波，一个用于纵波。这些因素已被评估为立方和六方金属。从测量的弹性常数来看，具有低损耗的金属只有铝、镁和钨。计算表明，铝和镁的损失是大约相等的纵波，但剪切波镁有一个非常低的剪切损失。实验发现，镁的损耗几乎与熔融石英一样低。更高频率的实验表明，当波长为1000 nm时，镁的损耗几乎与熔融石英一样低。
When high frequency longitudinal and transverse sound waves are sent through a multicrystalline rod of metal, attenuation losses result because of scattering and diffusion of sound waves by the grains. When the grain size is less than one‐third of the wave‐length, these losses are due to Rayleigh fourth power law scattering and are proportional to the grain volume. The scattering factor depends on the anisotropy of the elastic constants. Two different factors are obtained, one for shear waves and one for longitudinal waves. These factors have been evaluated for cubic and hexagonal metals. From the measured elastic constants the only metals with a low loss are aluminum, magnesium, and tungsten. The calculations indicate that the losses for aluminum and magnesium are about equal for longitudinal waves, but for shear waves magnesium has a very low shear loss. It has been found experimentally that magnesium has nearly as low a loss as fused quartz.Experiments with higher frequencies show that when the wave‐le...