本文利用复应力函数与多项式映射函数相结合,计算了在多项式映射函数取不同项数时,无限域中的方孔在受单向拉伸、纯剪和内水压等荷载作用下,方孔角点的应力集中系数σ_max/P和名义应力强度因子K_t.计算表明,K_t与角点的曲率半径ρ存在着线性关系,因而将此直线外延至ρ=0处,求得角点在ρ=0时的应力强度因子K_1. In this paper, the complex stress function is combined with the polynomial mapping function to calculate that when the polynomial mapping function takes different terms, the square hole in the infinite field under the action of uniaxial tension, pure shear and internal water pressure, square hole The calculation of the stress concentration factor σ_max/P and the nominal stress intensity factor K_t. of the corner point shows that there is a linear relationship between K_t and the radius of curvature ρ of the corner point, so the straight line is extended to ρ=0, and the corner point is obtained at ρ= 0 stress intensity factor K_1.