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首页> 外文期刊>Zeitschrift fur Angewandte Mathematik und Mechanik >Semi-analytical Solution of the Problem of Elastic Wave Scattering by Elliptical Cracks
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Semi-analytical Solution of the Problem of Elastic Wave Scattering by Elliptical Cracks

机译:椭圆形裂纹弹性波散射问题的半解析解

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摘要

The problems for elliptical cracks situated in an infinite elastic solid and subjested to static and time-harmonic loads are considered. Traction boundary pseudodifferential equations are used for the solution to the problems. An analytical method is developed for the solution to the equations. The method leads to the constructive procedure for obtaining analytical solutions in the case of arbitrary static polynomial loads. If the loads are time-harmonic and their amplitudes can be expanded in the power series by the wave number with polynomial coefficients in the range of low frequencies then the method leads to the procedure of the expansion of the solution into the Taylor's series by the wave number. This class of loads includes particularly the loads corresponding to the problems of scattering plane longitudinal and shear waves obliquely incident to the crack surface. Taylor's series expansion is an accurate approximation of the solution only for low wave numbers. Pade approximants extend the range of accurate approximation of the solution from low to intermediate, wave numbers.
机译:考虑椭圆形裂纹位于无限弹性固体中并服从静态和时谐载荷的问题。牵引边界伪微分方程用于解决这些问题。开发了一种用于求解方程的解析方法。该方法导致在任意静态多项式载荷情况下获得解析解的建设性程序。如果载荷是时谐的,并且其振幅可以通过具有在低频范围内的多项式系数的波数在幂级数中扩展,则该方法将导致由波将解扩展为泰勒级数的过程数。这类载荷尤其包括与散射平面纵向和倾斜入射到裂缝表面的剪切波的问题相对应的载荷。泰勒级数展开式仅是针对低波数的解决方案的精确近似。 Pade近似值将解决方案的精确近似范围从低波数扩展到中间波数。

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