20.500.12556/DKUM-27471 Micromechanical analysis of constraint effect on fracture initiation in strength mis-matched welded joints In this paper the micromechanical approach to ductile fracture was applied in a study of constraint effect crack growth initiation in mismatched welded joints. The single edged- notched bend specimens (precrack length ▫$a_o/W=0.32$▫) were experimentally and numerically analysed. The coupled micromechanical model prposed by Gurson, Tvergaard and Needleman was used. Constraint effect was tested by varying widths of the welded joints (6, 12 and 18 mm). HSLA steel was used as the base metal in a quenched and tempered condition. The flux-cored arx-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 smmoth specimen. The difference in fracture behaviour between over- and undermatched welded joints obtained in experimental results was followed by numerical computationsof void volume fraction in front of the crack tip. fracture mechanics ductile fracture high strength low alloyed steel cracks micromechanical model mismatched welded joints constraint effect void growth lomna mehanika duktilni lom visokotrdnostna nizko legirana jekla razpoke nekovinski vključki rast praznin mikromehanski model trdnostno neenaki zvarni spoji true false false Angleški jezik Angleški jezik Neznano 2012-06-01 11:19:11 2012-06-01 11:19:11 2022-04-15 03:44:55 2019-07-10 12:17:40 2007 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.1/2:539.42 11140630 0255-5476 URN:SI:UM:DK:9GATA354 http://www.scientific.net/0-87849-441-3/571/ 1 https://dk.um.si/Dokument.php?lang=slv&id=36771 Fakulteta za strojništvo 0 0 0