Abstract
Fracture dynamics of Homalite-100, PMMA and epoxy were studied. Fracture surfaces were examined by a roughness meter to correlate the surface roughness λ with such fracture parameters as crack velocity a^^· and crack extension resistance R*. High-speed photography of fracture caustic images gave those values. Correlations between λ and those parameters have shown that, although λdepends on a^^· or on R*, λ is not a unique function of one of those parameters. It is found that λ has the best correlation with the product R*· a^^·, i.e., dissipated energy per unit crack front and unit time.
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