WHAT THE DESIGNER MUST KNOW ABOUT FRACTURE MECHANICS

Traditional design criteria make no attempt to account for the failure mode which is characteristic of a flawed, frangible structure. A design rationale is outlined for brittle and brittle-ductile transition materials which contain flaws caused, for example, by metallurgical inclusions; fabrication and erection overloads, and fatigue cracking. Linear elastic fracture mechanics can be employed successfully for high strength-low toughness materials design. Laboratory test results for critical values of Kc, the stress intensity factor, may be applied to combined load problems by use of the strain-energy-density factor Sc. Design with materials of higher toughness/yield strengh ratios follows essentially the same procedure with a slight modification in interpretation of the fracture toughness parameter. A number of example problems are solved and the results compared with those obtained using the traditional failure criterion.

  • Supplemental Notes:
    • Copies are $1.00 to ASME members.
  • Corporate Authors:

    American Society of Mechanical Engineers

    Two Park Avenue
    New York, NY  USA  10016-5990
  • Authors:
    • SIH, G C
    • MacDonald, B
  • Publication Date: 1973-1

Media Info

  • Features: Figures; References;
  • Pagination: 17 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00050323
  • Record Type: Publication
  • Source Agency: American Society of Mechanical Engineers
  • Report/Paper Numbers: ASME #73-DE-19 Paper
  • Files: TRIS
  • Created Date: Jan 24 1976 12:00AM