一、引言边界元方法的直接列式法(以下简称为直接法)是以贝蒂(Betti)互换定理为基础的弹性力学问题的数值解法。虽然贝蒂互换定理早在上一世纪就已提出,但直到1967年,里佐(F.J.Rizzo)才提出了边界积分方程直接法的设想,克鲁斯(T·A·Cruse)在1969年完成了有关公式的推导,这一方法才被完全确立。由于直接法有着严格的理论基础,应用极为广 I. INTRODUCTION The direct list method of the boundary element method (hereinafter abbreviated as the direct method) is a numerical solution to the elasticity problem based on Betti’s reversal theorem. Although the Betty swapping theorem was proposed as early as the last century, it was not until 1967 that FJ Rizzo proposed the idea of ​​the direct method of the boundary integral equation, which was completed by TA Creuse in 1969. With regard to the derivation of the formula, this method is fully established. Because the direct method has a strict theoretical basis, it is widely used.