本文采用光弹性应力“冻结”法,测定了平塑压圆柱体内应力σ_θ、σ_r的空间分布。圆柱体模型的H/D值分别为0.5,1.0,1.5和2.0。摩擦系数μ=0.47。实验结果发现圆柱体内存在一个σ_θ≠σ_r区,由此对Haar-Karman假定进行了分析和讨论。根据计算结果,该假定在变形力计算过程中所导致的最大相对误差不超过百分之一。 In this paper, the spatial distribution of stresses σ_θ and σ_r in a flat plastic cylinder is measured by using the “freezing” method of photoelastic stress. The cylinder model has H/D values ​​of 0.5, 1.0, 1.5, and 2.0, respectively. The coefficient of friction μ=0.47. The experimental results show that there exists a σ_θ≠σ_r zone in the cylinder, and the Haar-Karman hypothesis is analyzed and discussed. According to the calculation results, the maximum relative error caused by this assumption in the deformation force calculation process does not exceed one percent.