After upgrading the energy dissipation algorithm, numerical experiments were conducted to assess the reliability of the explicit dynamic finite element code, HCRACK. Two dynamic fracture specimens, i.e., the wedge-loaded rectangular DCB (RDCB) specimen and the wedge-loaded tapered DCB (TDCB) specimen, were then analyzed with this updated fracture dynamic code. Using the experimentally determined dynamic fracture toughness, K sub ID, versus crack velocity, a-dot, relation, the RDCB specimen was analyzed first by the "propagation method" where good agreements between calculated and measured K sub ID versus a relation were observed. The calculated a versus time, t, relation was then used as input data in the "generation method" where the resultant K sub ID were virtually identical to those obtained in the propagation method. Error analyses of the generation method were also made first by using the experimentally determined a versus t relation and secondly by artifically perturbing this relation. A TDCB specimen was then analyzed with both the propagation and generation methods by using the K sub ID versus a-dot relation established for this specimen and the measured a versus t relation, respectively. The computed K sub ID obtained by both methods were good agreement with the experimental results, showing that either approach can be used in analyzing fracture.

  • Corporate Authors:

    University of Washington, Seattle

    Department of Mechanical Engineering
    Seattle, WA  United States  98105
  • Authors:
    • Hodulak, L
    • Kobayshi, A S
    • Emery, A F
  • Publication Date: 1979-2

Media Info

  • Pagination: 30 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00197758
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: TR-34 Tech Rpt.
  • Contract Numbers: N00014-76-C-0060
  • Files: TRIS
  • Created Date: Sep 15 1979 12:00AM