A calculation method of elastic wave propagation based on an improved finite-difference method was developed using two-stage elastic wave equations composed of two independent variables of stress and particle velocity. Combination of the two-stage equations and the simple calculation model of elastic materials, which was used in a previous calculation method developed by the author, enables faster and more stable calculation of 3-dimensional ultrasonic propagation in combined materials with elastic anisotropy. Ultrasonic propagation of the boundary between water and steel, realization of characteristic surface motion of Rayleigh waves and anisotropic propagation of ultrasound in uni-directional CFRP was demonstrated to show performance of the developed method.
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