To analyze the crack growth characteristics of special-shaped charges, a digital laser caustics test system was used to study the crack growth process of special-shaped charges; theoretical calculations of the caustic line distribution of type I and II cracks were carried out, and crack growth under the action of the explosion load was calculated. The shape is binarized to obtain the fractal dimension of charges of different shapes. The finite element software LS-DYNA is used to simulate the crack propagation of special-shaped charges. The research results show that the main crack propagation of the special-shaped charge has obvious directionality, and the main crack propagation direction is basically along the internal angle bisector of the special-shaped charge; the fractal dimension of the special-shaped charge is: hexagon>circle> square>triangle. With the increase of the side length of the special-shaped charge, the number of main cracks gradually increases, but the direction and number of crack propagation of the round charge show randomness. The main crack growth rate of the triangular-shaped charge is the fastest, and the stress intensity factor at the crack tip is the highest; the numerical simulation results of the main crack growth direction and number of triangular, square, and hexagonal charges are basically the same as those of the explosion test, but there is a point in the circular blasthole deviation.
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