COMPARISON OF VARIOUS METHODS OF MEASURING K1C ON SMALL PRECRACKED BEND SPECIMENS THAT FRACTURE AFTER GENERAL YIELD

An experimental investigation into the measurement of fracture toughness on small precracked bend specimens after general yield is described. Six parameters are compared on the basis of their accuracy and utility in predicting KIc. The parameters are: (1) the on-load crack tip opening displacement, COD, (2) the lateral (notch root, crack tip) contraction, NRC, (3) the angle of bend, (4) the stretch zone, (5) the J integral, and (6) the equivalent energy. The results show that, from the standpoint of accuracy and of ease of measurement, the plane strain COD at fracture initiation, (COD)Ic, is the most useful parameter for measuring KIc on small specimens that fracture after general yield. (Author)

• Corporate Authors:

  University of California, Los Angeles

  School of Architecture and Urban Planning
  Los Angeles, CA  United States  90024
• Authors:
  • Robinson, J N
  • Tetelman, A S
• Publication Date: 1974-1

Media Info

• Pagination: 44 p.

Subject/Index Terms

• TRT Terms: Core samples; Cracking; Fracture mechanics; Measurement; Stresses
• Uncontrolled Terms: Crack propagation; Stress intensity factors
• Old TRIS Terms: Crack opening measurement; Precracked test specimens
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00057214
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: UCLA-ENG-7409 Tech. Rpt.
• Contract Numbers: DAHC04-69-C-0008
• Files: TRIS
• Created Date: Aug 16 1974 12:00AM