Therefore, these equations with vanishing body forces cannot admit plane wave solutions under an arbitrary initial state of stress . 因此,这些方程当彻体力为零时,在任意的初始胁强状态下并不具备平面波解。
A special type of unsteady motions which bear a resemblance to plane wave solutions of the linear theory of elasticity can be constructed . 一种特殊类型的、和线性弹性理论中的平面波解有点相象的非稳态运动可以建立起来。