Abstract
Edge-cracked specimen of commercially available polymethylmethacrylate (PMMA) having about triple thickness in a region surrounding a segment of the prospective fracture path have been loaded in the extensional mode. The crack-tip velocity has been determined by streak photo methods. The velocity profiles obtained are in good agreement with theoretical predictions. It is demonstrated that the arrest capabilities of the region having deviating thickness can be expressed in terms of a T/P- value . The results correspond well with the theoretically found conservative crack arrest condition T/P < 1. Finally it may be concluded that it seems to be highly questionable that an arrest toughness being a material property should exist.
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