EFFECT OF DUCTILE AND VISCOUS DISSIPATION ON FRACTURES OF SOLIDS

Effect of small scale yielding occurring prior to fracture is discussed in terms of stress and strain fields existing in the immediate vicinity of crack tip. The deformation theory of plasticity is employed. Although the solution is incomplete since it does not provide the shape of the plastic zone, it generates some useful correlations between fracture toughness and other metallurgical parameters, like yield strength, ductility strain hardening exponent and the grain size. In the second part a governing equation of motion, which describes early stages of fracture in a rate-sensitive solid, has been integrated through the use of an analog computer type EAI 380. Three regimes of the tensile pulsating loading, for which there are no closed form solutions, are considered: (i) sinusoidal load, (ii) trapezoidal load, and (iii) randomly oscillating load.

• Corporate Authors:

  South Dakota State University, Brookings

  Department of Mechanical Engineering
  Brookings, SD  United States 
• Authors:
  • Wnuk, M P
• Publication Date: 1971-8

Media Info

• Features: Figures; References;
• Pagination: 40 p.

Subject/Index Terms

• TRT Terms: Cracking; Ductility; Fatigue cracking; Fracture mechanics; Fracture properties
• Uncontrolled Terms: Crack propagation
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00019484
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: CNN0001770C0077 Tech Rpt
• Files: TRIS
• Created Date: Nov 8 1973 12:00AM