On singular features of acoustic wave propagation in weakly dissipative anisotropic thermoviscoelasticity
On singular features of acoustic wave propagation in weakly dissipative anisotropic thermoviscoelasticity
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DOI：
10.1007/bf01175976
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发表时间：
2000-03
期刊：
影响因子：
2.7
通讯作者：
A. Shuvalov;N. Scott
中科院分区：
文献类型：
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作者：
A. Shuvalov;N. Scott
在低损耗近似下，研究了粘性和热导率对平面体声波传播的联合影响。弱耗散对那些不平行于对称轴并且因此分裂成不位于对称平面中的简并复波矢量对的声轴（在没有耗散的情况下发生的相速度简并的方向）附近的波性质具有显著影响。分析了相邻区域波分支的分叉性质和偏振态的剧烈变化特征。研究了波矢简并沿着两两方向上允许的指前振幅与空间线性相关的波动解。
The joint effect of viscosity and heat conductivity on the propagation of plane bulk acoustic waves is studied in the low-loss approximation. Weak dissipation has significant impact on wave properties in the neighborhood of those acoustic axes (directions of phase-speed degeneracy occurring in the absence of dissipation) which are not parallel to symmetry axes and which therefore split into pairs of degenerate complex wave vectors not lying in symmetry planes. The bifurcation nature of the wave branches in the neighboring domain and the drastically changing polarization features are analyzed. Wave solutions containing linear spatial dependence of the pre-exponential amplitude admitted along pairwise directions of wave-vector degeneracy are studied.