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Fatigue Crack Propagation Behavior of Steel Plate of Laser Welded Tailored Blank  

Han, Moon-Sik (계명대학교 기계.자동차공학부)
Lee, Yang-Sub (계명대학교 기계.자동차공학부)
Publication Information
Transactions of the Korean Society of Machine Tool Engineers / v.15, no.3, 2006 , pp. 120-126 More about this Journal
Abstract
In this paper, we investigated the characteristics of fatigue fracture on TB(Tailored Blank) weldment by comparing the fatigue crack propagation characteristics of base metal with those of TB welded sheet used for vehicle body panels. We also investigated the influence of center crack on the fatigue characteristic of laser weld sheet of same thickness. We conducted an experiment on fatigue crack propagation on the base metal specimen of 1.2mm thickness of cold-rolled metal sheet(SPCSD) and 2.0mm thickness of hot-rolled metal sheet(SAPH440) and 1.2+2.0mm TB specimen. We also made an experiment on fatigue crack propagation on 2.0+2.0mm and 1.2+1.2mm thickness TB specimen which had center crack. The characteristics of fatigue crack growth on the base metal were different from those on 1.2+2.0mm thickness TB specimen. The fatigue crack growth rate of the TB welded specimens is slower in low stress intensity factor range$({\Delta}K)$ region and faster in high ${\Delta}K$ region than that of the base metal specimens.
Keywords
Laser weldment; Tailored blank; Different thickness; Fatigue crack propagation; Heat affected zone;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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