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arXiv 1302.1350cond-mat.mtrl-scimath-phmath.MP
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二维周期裂纹阵列对反平面弹性波的散射

Scattering of antiplane elastic waves by two-dimensional periodic arrays of cracks

Mihai Caleap

摘要:

在损伤固体中弹性波传播的背景下,二维周期性裂纹阵列的反平面波散射的分析方法。在考虑裂纹阵列的研究之前,首先研究了平面裂纹对反平面波的散射。然后,利用平面散射位移的表达式,考虑裂纹间距的周期性条件,得到了参考裂纹裂纹面位移的边界积分方程。反射和透射系数的数值结果作为裂纹间距的函数,激励的频率,和入射角。最后,研究了二维周期裂纹阵列中反平面波的传播。尽管使用了有限数量的线性阵列,但人们认识到周期性介质的透射谱的带通滤波或带阻特性的影响。由于在周期性的障碍的影响进行了分析。

英文摘要:

In the context of elastic wave propagation in damaged solids, an analytical approach for scattering of antiplane waves by two-dimensional periodic arrays of cracks is developed. Before considering the study of arrays of cracks, the scattering of an antiplane wave by a flat crack is first studied. Then, using the representation formula for the scattered displacement by a flat and by considering the periodicity condition of the crack-spacing, a boundary integral equation is obtained for the crack face displacement of the reference crack. Numerical results for the reflection and transmission coefficients are presented as functions of the crack-spacing, the frequency of excitation, and the angle of incidence. Finally, the propagation of antiplane waves by two-dimensional periodic arrays of cracks is studied. Despite the use of a finite number of linear arrays, one recognizes the effects of band-pass filtering or band rejection characteristics of the transmission spectra of a periodic medium. Effects due to a disorder in the periodicity are also analysed.

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