The fracture profile of ductile iron has been extracted by means of an S 600 digital image processing system and its fractal characteristics are studied with a classical Mandelbrot fractal model and an Underwood modified fractal model.

• 应用S600数字图像处理系统提取球墨铸铁断口纵剖面线，根据经典的Mandelbrot分形模型和Underwood修正分形模型对其分形特性进行了研究；