Influence of Dynamic Fracture Toughness on Dynamic Crack Propagation.

摘要

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), versus 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) versus (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) versus (a) relations 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. (Author)