The 2-D nonlinear longitudinal wave in the isotropy solid medium studied in this paper is the finiteamplitudewave, which thought about the nonlinear of the motion and medium.
本文研究了各向同性固体介质中的二维非线性有限振幅纵波，采用有限元方法求解二维非线性纵波运动方程。
2
Wave distortion will occur when finiteamplitude ultrasonic waves propagate in elastic solids, resulting in the production of higher order harmonics.
有限振幅的超声波在固体中传播时会发生波形畸变，伴随着高次谐波的出现。
3
The phenomenon of subharmonic bifurcation is observed in experiments of sound wave of finiteamplitude, which are performed in liquid nitrogen and water, respectively. The power spectrum is obtained.