Abstract

A high-speed photographic investigation of the initiation and propagation of radial and median cracks in transparent samples of a brittle epoxy and polymethylmethacrylate is described. The cracks were generated by low-velocity impact with hard spherical and conical indenters, and it is shown that radial cracks always initiate on the impacted surface at the circle of contact. These radial cracks then grow to form median cracks, encircling the deformed zone around the indentation. High-speed photography has also been used to elucidate the fracture processes involved in making stone tools.

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