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利用广义分数维模型和Ｓ６００数字图像处理系统，研究了球状石墨表面分维与球铁多次冲击韧性的关系。结果表明，随球状石墨表面分维增大，球铁多次冲击韧性减小；表面分维与多次冲击韧性的对数值呈线性关系；当冲击能量较小时，多次冲击韧性对球状石墨分维更敏感；与二维定量参数形状因子比较，表面分维对工艺因素的响应性及与动态性能的相关性更好，可作为衡量球铁多次冲击韧性的一种量度。
Using the generalized fractal model and the S600 digital image processing system, the relationship between the surface fractal dimension of spherical graphite and the ductile toughness of ductile iron was studied. The results show that the ductile toughness of the ductile iron decreases with the increase of fractal dimension of the spherical graphite. The fractal dimension of the ductile iron has a linear relationship with the logarithm of the multiple impact toughness. When the impact energy is small, Compared with the shape factor of 2D quantitative parameters, the surface fractal dimension has better response to process factors and better correlation with dynamic properties, which can be used as a measure of multiple impact toughness of ductile iron.