本文用光弹性方法较系统地探讨了人工裂缝曲率半径ρ对应力强度因子K_Ⅰ、K_Ⅱ、K_Ⅲ的影响。实验结果初步表明:在ρ<0.04mm时,看来会得到K_Ⅰ较满意的结果。ρ=0.12mm时,K_Ⅰ实测值较理论值尚无显著偏差(-4.83％);ρ对K_Ⅱ影响较K_Ⅰ为大;K_Ⅲ实测值对于ρ的变化似不敏感。 In this paper, the influence of the radius of curvature ρ of the artificial fracture on the stress intensity factors K_I, K_II, and K_III is systematically discussed using the photoelastic method. The results of the experiment initially show that when ρ < 0.04mm, it appears that K_I will be more satisfactory. When ρ=0.12mm, the measured value of K_I has no significant deviation from the theoretical value (-4.83%). The effect of ρ on K_II is larger than that of K_I. The measured value of K_III does not seem to be sensitive to the change of ρ.