Abstract
A dynamic finite element code was used in its “propagation mode” to assess the differences in dynamic crack propagation in a wedge-loaded (WL) single-edged notch (SEN) specimen, a tapered double cantilever beam (TDCB) specimen and a rectangular double cantilever beam (RDCB) specimen. The dynamic fracture toughness, K ID, vs the crack velocity, a, relations determined experimentally for WL-SEN, WL-TDCB and WL-RDCB specimens machined from Araldite B were used as dynamic fracture criteria and the resultant k id variations with crack propagations in the three specimens were compared with the corresponding experimental results. While the specific K ID vs /.a relations established for each specimen obviously yielded calculated k ID which were in best agreement with the experimental K ID for the respective specimen, the K ID vs /.a relation for the large WL-SEN specimen provided the best overall fit between the calculated and measured K ID variations with crack propagation in all three specimens.
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