RUNNING CRACK IN AN INCIDENT WAVE FIELD

Steady-state diffraction of stress waves by a semi-infinite running crack is considered in this study. In conjunction with the principle of superposition, an exact solution is obtained by using a method based on the Wiener-Hopf technique. As in the static case, the dynamic stresses possess the familiar inverse square-root singularity at the crack tip. The stress-intensity factors, however, are found to depend on the incident wave length, angle of incidence, Poisson's ratio of the elastic solid and speed of crack propagation. The stress-intensity factor serves as a useful parameter in studying elasto-dynamic crack problems since it can be associated with the rate at which elastic and kinetic energies are released by the crack. Ductile fracture is studied by adapting the Dugdale's hypothesis. The length of the plastic zone is determined and the influence of the speed of crack propagation is displayed graphically.

• Corporate Authors:

  Lehigh University

  Institute of Fracture and Solid Mechanics
  Bethlehem, PA  United States  18015
• Authors:
  • Chen, E P
  • SIH, G C
• Publication Date: 1972-5

Media Info

• Pagination: 67 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: 00035657
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: 1FSM-72-17
• Contract Numbers: N00014-68-A-0514
• Files: TRIS
• Created Date: Oct 27 1972 12:00AM