抄録
The dynamic fracture surface formation of PMMA and epoxy was studied. Fracture parameters such as crack velocity a^^· and crack extension resistance R* were obtained by high-speed photography of fracture caustic images. The density of surface marking was also obtained by examination of the fracture surfaces. Correlations between the density μ and the fracture parameters have shown that, although μ depends on a^^· or on R*, μ is not a unique function of one of those parameters. It is found that μ has the best correlation with the product R*· a^^·, i.e., dissipated energy per unit crack front and unit time.
