会议专题

Local Approach Applied to the Fracture Toughness of Resistance Spot Welds

  A recently developed methodology for measuring the nugget fracture toughness in mode I was applied to three high-strength steel resistance spot welds,exhibiting either mixed cleavage/ductile or ductile fracture at room temperature.Fracture toughness tests revealed a difference in ductile-to-brittle transition temperature between the welds.Constitutive equations of weld nuggets were determined and implemented in a finite element model of the fracture toughness test,revealing both in-plane bending and in-plane stretching in front of the crack tip.Brittle cleavage fracture of the nuggets is not conveniently described using a simple Ritchie-Knott-Rice approach but the Rice-Tracey model allowed quantitatively relating the high number density of small particles to the nugget fracture toughness in the ductile regime.

Local approach Brittle to ductile transition High strength steels Resistance spot welds

Florent Krajcarz Anne-Fran(c)oise Gourgues-Lorenzon Emmanuel Lucas Matthieu Mazière André Pineau

MINES ParisTech,Centre des Matériaux,UMR CNRS 7633,BP 87,91003 Evry cedex,France;ArcelorMittal Globa MINES ParisTech,Centre des Matériaux,UMR CNRS 7633,BP 87,91003 Evry cedex,France ArcelorMittal Global R&D,BP 30320,57283 Maizières-lès-Metz cedex,France

国际会议

第13届国际断裂大会(ICF2013)

北京

英文

1-10

2013-06-16(万方平台首次上网日期,不代表论文的发表时间)