ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 7

Investigation of Dynamic J_Id for Alloy Steel Weldments Using the Split Hopkinson Bar

Bassim, MN
Professor, Research Associate, and Professor, University of Manitoba, Winnipeg, Manitoba

Bayoumi, MR
Professor, Research Associate, and Professor, University of Manitoba, Winnipeg, Manitoba

Hsu, TR
Professor, Research Associate, and Professor, University of Manitoba, Winnipeg, Manitoba

Matthews, JR
Defence Scientist, Defence Research Establishment Atlantic, Dartmouth, Nova Scotia

(Received 6 August 1985; accepted 13 March 1986)

Abstract

The fracture toughness parameter J_Id, under dynamic loading conditions, was determined for weldments of HY80 and QT28 alloy steels using a split Hopkinson bar technique. J_Id was obtained for the fusion zone, the heat-affected zone, and the base metal for these steels as a function of temperature in the range of −80 to 25°C and at loading rates of ˙K = 10⁶ MPa√m s⁻¹. Wedge loaded compact tension specimens were loaded in a split Hopkinson bar. The onset of stable crack growth was determined by using a strain gage that was attached ahead of a fatigue crack. The results show that, at −80°C, fracture with limited stable crack growth takes place, while for all other testing conditions considerable ductility precedes fracture of these alloys.

Keywords:
dynamic fracture toughness, loading rates, temperature, split Hopkinson bar, alloy steel weldments, wedge loaded compact tension specimen

Paper ID: JTE10334J
DOI: 10.1520/JTE10334J
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