奇异积分在边界元中的计算方法

Method of Calculating Singular Integral in Boundary Element

对二维问题的线性单元和二次单元给出了 ln 1r奇异性与 1r奇异积分精度可以达到一定数值要求的求积公式。对二维问题临近边界内点的应力也提出了一个计算方法 ,使“边界层效应”

As far as a linear unit and a secondary unit in two dimentional problem are concerned,this paper presents the quandrature formula with ln 1r singularity and 1r singular integral accuracy required to reach a specifiz numerical value. Also, a calculating method is presented to greatly reduce the boundary layer effect according to the strains adjacent to the boundary interior point of two dimensional problem.