THE EFFECT OF A A/W RATIO AND CRACK SHAPE ON JI AND DELTA J VALUES IN A SHIP PLATE STEEL

An experimental study for determining Ji and delta i in three-point bend specimens has been carried out on a ship plate steel, using both through-cracked specimens with different a/W ratios and semi-elliptical cracked ones. The results of through-thickness crack show that a fracture toughness peak value which is about 40% higher than that of the standard deep crack one exists in the Ji-a/W and delta i-a/W curves. With increasing a/W values Ji or delta i values first go up and then down when they get over the peak value, finally tend to a constant which is the fracture toughness of the material in the way of standard test. The results of semi-elliptical cracked testing give a delta i value about 10% higher than that of the through-thickness ones. A theoretical analysis is simply introduced for the slipline field in a three-point bend specimen containing a short crack. Some new methods for calculating J-integral values are also introduced and compared in this paper.

  • Supplemental Notes:
    • ISOPE 91, 1st Intnl Offshore & Polar Engng Conference; 11-16 Aug 1991; Edinburgh, U.S. Sponsored by Intl Soc Offshore & Polar Engrs (ISOPE) et al. Procs. Publ by ISOPE, ISBN 0-9626104-61, Vol IV, p 137 [6 p, 12 ref, 4 tab, 8 fig]
  • Authors:
    • Li, Q
    • Shi, D
  • Publication Date: 1991

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00716256
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Feb 28 1996 12:00AM