Both the incremental method with the tangent stiffness and the remodified Newton-Raphson method is used to complete the prebuckling stress distribution in elastic and plastic ranges. A bifurcation analysis is performed using Stowell's deformation theory to evaluate the elasto-plastic buckling of thin component structure. 利用切线刚度增量法和修正的Newton-Raphson法计算屈曲前的弹塑性内力分布,然后和用Stowell形变理论和逆幂叠代法求弹塑性屈曲荷载。