Abstract
Crack branching in Araldited and Homalite-911 was studied using a modified Cranz-Schardin type high speed camera which provided simultaneously taken shadow patterns and specimen-focussed images. Fracture parameters including crack velocity a, stress intensity factorK d and specific crack extension resistanceR ✶ were measured in the course of crack propagation. No definite critical values could be determined with one of those fracture parameters for the onset of crack branching. Instead, the productR ✶a, i.e., energy per unit crack width per unit time, was found to have a critical value for the branching.
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Arakawa, K., Takahashi, K. Branching of a fast crack in polymers. Int J Fract 48, 245–254 (1991). https://doi.org/10.1007/BF00012915
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DOI: https://doi.org/10.1007/BF00012915