Abstract
Elucidating the morphology of impact cracks on the surface of walnut that is specific hollow shell particle is an effective way to reveal its fracture mechanisms. Unfortunately, there are few investigations about the morphology of impact cracks, especially crack irregularity. Thus, using image processing techniques and fractal theory, crack path roughness describing the tortuosity of crack path and crack branching coefficient characterizing sensibility to crack branch were used to quantify crack irregularities, respectively. The effects of walnut size and impact energy on crack irregularities were analyzed. The results show that fractal dimension could quantify crack irregularity. For crack path roughness, the effect of walnut size is larger than that of impact energy, whereas for crack branching coefficient, the effect of walnut size and impact energy are both significant. In addition, the relationship between crack path roughness and crack branching coefficient meets inverse function with exponential form according to energy conservation.
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