论文标题
关于基于键基的动力学模型的边界条件的处理
On the treatment of boundary conditions for bond-based peridynamic models
论文作者
论文摘要
在本文中,我们提出了两种应用基于键基的动力学模型的边界条件的方法。近年来,人们对所谓的非本地模型的类别产生了重新兴趣,其中包括perideNanic模型,用于模拟结构力学问题,这是对经典的局部连续体模型的替代方法。但是,在处理此类模型时通常会忽略的一个主要问题与应规定边界条件的方式有关。我们的观点是,由于应用于固体体的表面,经典边界条件自然与局部模型相关联。本文描述了将经典的Dirichlet和Neumann边界条件纳入基于键基的Peridynanigics的两种方法。第一种方法包括用薄的边界层人为地扩展域,在该边界层上,将位移字段在其上作为相对于边界点的奇数函数。第二种方法诉诸于这样的想法,即perid肌模型和局部模型应兼容所谓的地平线消失的极限。然后,该方法是将地平线从域内部的恒定值降低到边界处的零组成的,从而可以直接应用经典的边界条件。我们介绍了这两种方法的连续和离散表述,并评估了它们在用于模拟一维栏的几个数值实验上的性能。
In this paper, we propose two approaches to apply boundary conditions for bond-based peridynamic models. There has been in recent years a renewed interest in the class of so-called non-local models, which include peridynamic models, for the simulation of structural mechanics problems as an alternative approach to classical local continuum models. However, a major issue, which is often disregarded when dealing with this class of models, is concerned with the manner by which boundary conditions should be prescribed. Our point of view here is that classical boundary conditions, since applied on surfaces of solid bodies, are naturally associated with local models. The paper describes two methods to incorporate classical Dirichlet and Neumann boundary conditions into bond-based peridynamics. The first method consists in artificially extending the domain with a thin boundary layer over which the displacement field is required to behave as an odd function with respect to the boundary points. The second method resorts to the idea that peridynamic models and local models should be compatible in the limit that the so-called horizon vanishes. The approach consists then in decreasing the horizon from a constant value in the interior of the domain to zero at the boundary so that one can directly apply the classical boundary conditions. We present the continuous and discrete formulations of the two methods and assess their performance on several numerical experiments dealing with the simulation of a one-dimensional bar.