Micromechanical analysis of constraint effect on fracture initiation in strength mismatched welded
Rakin, Marko P.
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In this paper the micromechanical approach to ductile fracture was applied in a study of constraint effect on crack growth initiation in mismatched welded joints. The single-edged notched bend specimens (precrack length a(0)/W=0.32) were experimentally and numerically analyzed. The coupled micromechanical model proposed by Gurson, Tvergaard and Needleman was used. Constraint effect was tested by varying widths of the welded joints (6, 12 and 18mm). High-strength low-alloyed (HSLA) steel was used as the base metal in a quenched and tempered condition. The flux-cored are-welding process in shielding gas was used. Two different fillers were selected to obtain over- and undermatched weld metal. The micromechanical parameters used in prediction of the crack growth initiation on precracked specimen were calibrated on a round smooth specimen. The difference in fracture behavior between over- and undermatched welded joints obtained in experimental results was followed by numerical computations... of void volume fraction in front of the crack tip.
Кључне речи:constraint effect / ductile fracture / high-strength low-alloyed steel / micromechanical model / mismatched welded joint
Извор:Materials Science Forum, 2007, 555, 571-+
- Ministry of Science and Environmental Protection [OI144027], Slo-Ser
- Research Trends in Contemporary Materials Science, 8th Conference of the Yugoslav-Materials-Research-Society (Yu-MRS), Sep 04-08, 2006, Herceg Novi, Montenegro
ISSN: 0255-5476 (print)