A MODIFIED QUADTREE ALGORITHM FOR AUTOMATICAL MESH GENERATION AS APPLIED TO COMPUTATIONAL CRACK PATH PREDICTION

One of the recent advances in fracture mechanics concerns crack path prediction. The impetus has been twofold: a need for a better understanding of the micromechanical toughening mechanisms of non- metallic materials such as ceramics and advanced composites due to noncollinear crack extension; and growing concern regarding critical assessment at fracture and the related fracture control of potentially dangerous engineering structures. Several computational methods have been proposed for crack path prediction based on the finite element methods and the boundary integral equation methods, respectively, combined with appropriate crack path criteria. To improve computational efficiency and capability, an automated mesh- generating method, called the modified quadtree method, is applied to the computational crack path prediction proposed by the first author. The method is applied to crack path prediction along a butt-weld plate made of mild steel. Numerical simulations are performed by taking into account the effects of applied stresses and residual stresses. Although the initial crack is located along the toe of weldment, once the crack begins to extend, it is sharply curved to the base metal owing to the tensile residual stress, and it continues to propagate in the base metal. This kind of crack propagation behavior qualitatively agrees with experimental results observed by several researchers.

  • Availability:
  • Supplemental Notes:
    • Journal article
  • Authors:
    • Sumi, Y
    • HAYASHI, S
  • Publication Date: 1990-6

Language

  • Japanese

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00661075
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM