Influence of dynamic fracture toughness on dynamic crack propagation

✍ Scribed by L. Hodulak; A.S. Kobayashi; A.F. Emery

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 730 KB
• Volume: 13
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(80)90043-0

✦ Synopsis

A dynamic finite element code was used in its "propagation mode" to assess the differences in dynamic crack propagat&n 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, Km, 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 KID variations with crack propagations in the three specimens were compared with the corresponding experimental results. While the specific Km vs a relations established for each specimen obviously yielded calculated Ku, which were in best agreement with the experimental Km for the respective specimen, the K ,,, vs a relation for the large WL-SEN specimen provided the best overall fit between the calculated and measured Km variations with crack propagation in all three specimens.