CONSTRAINT EFFECT BY STRENGTH MIS-MATCHING AND ITS APPLICATION TO KIC-MEASUREMENT

The applications of laser welds close to the notch of a toughness specimen was made to create a high-constrained condition near the notch tip. Laser welds enabled a very thin specimen (thickness B=2.5mm) to promote brittle fracture at a lower CTOD level than the full-thickness (B=20mm) homogeneous specimen. This is due to the plastic constraint induced by the strength mis-matching. Controlling factors for the plastic constraint were addressed by 3D FE-analysis. It was pointed out that the location of laser welds (distance from laser welds to the notch) and the shape of laser welds gave a marked effect on the plastic constraint around the notch. By contrast, the influence of the width of laser welds was marginal. By using strength mis-matching effect, the thickness requirement for KIC-measurement could be reduced to a large extent.

  • Supplemental Notes:
    • J Soc Naval Arch Japan, v 177, June 1995, p 269 [8 p, 12 ref, 3 tab, 16 fig]
  • Authors:
    • El-Shennawy, M
    • Minami, F
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717774
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM