One Inclusion in the Infinite Peristatic Matrix

V. Buryachenko
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Abstract

A basic problem of of micromechanics is analysis of one inclusion in the infinite matrix subjected to a homogeneous remote loading. A heterogeneous medium with the bond-based peri-dynamic properties (see Silling, J. Mech. Phys. Solids 2000; 48:175–209) of constituents is considered. At first a volumetric boundary conditions are set up at the external boundary of a final domain obtained from the original infinite domain by truncation. An alternative sort of truncation method is periodisation method when a unite cell (UC) size is increased while the inclusion size is fixed. In the second approach, the displacement field is decomposed as linear displacement corresponding to the homogeneous loading of the infinite homogeneous medium and a perturbation field introduced by one inclusion. This perturbation field is found by the Green function technique as well as by the iteration method for entirely infinite sample with an initial approximation given by a driving term which has a compact support. The methods are demonstrated by numerical examples for 1D case. A convergence of numerical results for the peristatic composite bar to the corresponding exact evaluation for the local elastic theory are shown.
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无限蠕动矩阵中的一个包含
细观力学的一个基本问题是分析无限矩阵中一个包体在均匀远程载荷作用下的问题。具有基于键的非均质介质的动态特性(参见Silling, J. Mech。理论物理。固体2000;48:175-209)的成分被考虑。首先在截断得到的最终域的外边界处设置体积边界条件;另一种截断方法是周期化法,当包涵体大小固定时,单位细胞(UC)的大小增加。在第二种方法中,将位移场分解为无限均匀介质的均匀载荷对应的线性位移和一个包含引入的微扰场。该扰动场是用格林函数技术和完全无限样本的迭代方法求得的,初始近似由具有紧支撑的驱动项给出。通过一维情况下的数值算例对该方法进行了验证。给出了弹性复合杆的数值结果收敛于相应的局部弹性理论的精确计算。
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