BIFURCATION OF A RUNNING CRACK IN ANTI-PLANE STRAIN

An elastodynamic explanation of a running crack bifurcation is explored. The geometry is a semi-infinite body in a state of anti-plane strain, which contains a two-dimensional edge crack. It is assumed that a quasi-static increase of the external loads gives rise to rapid crack propagation at time t=0, with an arbitrary and time-varying speed, but in the plane of the crack. A short time later the crack is assumed to bifurcate at angles - ntt and + ntt, and with velocities v. The elastodynamic intensity factors are computed, and the balance of rates of energies is employed to discuss the conditions for bifurcation.

• Supplemental Notes:
  • This work was sponsored by the Office of Naval Research, Structural Mechanics Program, Department of the Navy, Arlington, Virginia 22217.
• Corporate Authors:

  Northwestern University, Evanston

  Department of Civil and Environmental Engineering, 2145 Sheridan Road
  Evanston, IL  United States  60208
• Authors:
  • Achenbach, J D
• Publication Date: 1974-11

Media Info

• Features: References;
• Pagination: 32 p.

Subject/Index Terms

• TRT Terms: Cracking; Dynamic modulus of elasticity; Fracture mechanics; Stresses
• Uncontrolled Terms: Crack propagation; Elastodynamic analysis; Stress intensity factors
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00080059
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Report/Paper Numbers: NU-SML TR No. 75-2 Intrm Rpt
• Contract Numbers: N00014-67A-0356-0034
• Files: TRIS
• Created Date: May 1 1975 12:00AM