Expressions are presented for the stresses generated in the vicinity of a crack tip when a plane transient tension-stress wave, which is incident under an arbitrary angle, is diffracted by the crack. The effect of ductility effects on the combined Mode I and Mode II fractures is examined by assuming that yielding is restricted to a thin strip in the plane of the crack. Within this zone of yielding the normal stress in a certain defined direction is set equal to a yield stress of the material. It is shown that for a step-stress wave the leading edge of the zone of yielding initially moves at a constant speed, which is computed. The time for rupture at the trailing edge of the zone of yielding is also determined.

  • Supplemental Notes:
    • Prepared in cooperation with Utah University, Salt Lake City, Department of Mechanical Engineering. Also available in Journal of the Mechanics and Physics of Solids, V20, pp 203-222, 1972.
  • Corporate Authors:

    Northwestern University, Evanston

    Department of Civil and Environmental Engineering, 2145 Sheridan Road
    Evanston, IL  United States  60208
  • Authors:
    • Nuismer Jr, R J
    • Achenbach, J D
  • Publication Date: 1971-6-25

Media Info

  • Pagination: 21 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00041750
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Contract Numbers: 00014-67A-0356-0014
  • Files: TRIS
  • Created Date: Mar 19 1973 12:00AM