偏心加载下刚性圆板与横观各向同性层状半空间介质的接触问题

THE CONTACT PROBLEM BETWEEN A RIGID CIRCULAR PLATE AND A TRANSVERSELY ISOTROPIC LAYERED HALF-SPACE UNDER ECCENTRIC LOADING

  • 摘要: 本文研究了刚性圆板与n层横观各向同性半空间弹性介质之间的相互作用。层状半空间介质由n层有限厚度层和下部半空间均质介质组成,其中每一层为横观各向同性介质或各向同性介质,且不同层之间完全粘结。刚性圆板位于边界面上,与层状半空间介质光滑接触,并承受绕水平轴的力矩。采用经典积分变换分析了该层状半空间介质的边值问题。在变换域内,建立了刚性圆板和层状半空间介质相互作用的第二类Fredholm积分方程,推导了偏心加载刚性圆板作用下层状半空间介质弹性场的解析表达式。应用隔离技术,精确计算了含层状半空间介质核函数的半无限域积分,并发展了接触问题闭合解析解的数值方法。最后,算例分析描述了横观各向同性层状半空间介质弹性场的分布特征,揭示了非均质和横观各向同性对层状介质弹性场的影响。本文提出的方法适用范围较广,可用于分析任意类型和层数的横观各向同性层状半空间介质的接触问题。

     

    Abstract: This study examines the interaction between a rigid circular plate and a transversely isotropic layered half-space. The transversely isotropic layered half-space consists of finite layers and a lower half-space. The dissimilar layers are homogeneous and fully bonded. Each layer can be either transversely isotropic or isotropic. The rigid circular plate is smoothly placed on the horizontal boundary surface of the transversely isotropic layered half-space and subjected to a moment about a horizontal axis. Classical integral transform methods are used to solve the mixed boundary value problem. In the transform domain, the Fredholm integral equation of the second kind is established to describe the interaction between the rigid plate and the transversely isotropic layered half-space. A closed-form solution is derived for the elastic field of a transversely isotropic layered half-space subjected to indentation by a rigid circular plate. An isolating technique is employed to address the weak convergence of the integral associated with the kernel functions, and corresponding numerical methods are developed to solve the closed-form solution of this contact problem. Finally, the numerical results illustrate the influence of non-homogeneity and transverse isotropy on the elastic fields of layered half-spaces. The methods proposed are suitable for any type of transversely isotropic layered half-space with an arbitrary number of layers.

     

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