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首页> 外文期刊>International Journal of Solids and Structures >Dynamics of a system comprising a pre-stressed orthotropic layer and pre-stressed orthotropic half-plane under the action of a moving load
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Dynamics of a system comprising a pre-stressed orthotropic layer and pre-stressed orthotropic half-plane under the action of a moving load

机译：包含预应力正交异性层和预应力正交异性半平面的系统在运动载荷作用下的动力学

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摘要

This paper investigates the dynamic response to a moving load of a system comprising an initially stressed covering layer and initially stressed half-plane, within the scope of the piecewise-homogeneous body model utilizing three-dimensional linearized wave propagation theory in the initially stressed body. It was assumed that the materials of the layer and half-plane are anisotropic (orthotropic), and that the velocity of the line-located moving load is constant as it acts on the free face of the covering layer. The investigations were made for a two-dimensional problem (plane-strain state) under subsonic velocity of the moving load for complete and incomplete contact conditions. Corresponding numerical results were obtained for the stiffer layer and soft half-plane system in which the modulus of elasticity of the covering layer material (for the moving direction of the load) is greater than that of the half-plane material, which was assumed to be isotropic. Numerical results are presented and discussed for the critical velocity and stress distribution for various values of the problem parameters. In particular, it was established that, the critical velocity of the moving load is controlled mainly with a Rayleigh wave speed of a half-plane material and the initial stretching of the covering layer causes to increase these values.
机译：本文在分段均质体模型的范围内，利用三维线性化波传播理论在初始应力体中研究了包括初始应力覆盖层和初始应力半平面的系统对运动载荷的动力响应。假定层和半平面的材料是各向异性的（正交各向异性），并且线定位的移动载荷的速度由于作用在覆盖层的自由面上而恒定。对于完全和不完全接触条件下的运动载荷在亚音速下的二维问题（平面应变状态）进行了研究。对于较硬的层和软的半平面系统，获得了相应的数值结果，其中，覆盖层材料的弹性模量（对于载荷的移动方向）大于半平面材料的弹性模量，这被认为是各向同性。给出并讨论了各种问题参数值的临界速度和应力分布的数值结果。特别地，已经确定，主要通过半平面材料的瑞利波速度来控制移动负载的临界速度，并且覆盖层的初始拉伸导致这些值增大。

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