Vol.10, No3, 2010, pp.225-230
UDC  620.17 : 621.791.05   620.17 : 669.15

INVESTIGATION OF ELASTIC-PLASTIC FRACTURE MECHANICS PARAMETERS OF QUENCHED AND TEMPERED HIGH-STRENGTH STEEL WELDS

I. Hajro1, O. Pašić1, Z. Burzić2

1) Faculty of Mechanical Engineering, Sarajevo, Bosnia & Herzegovina

2) Military Technical Institute, Belgrade, Serbia

Abstract

The high-strength quenched and tempered steels in high stressed structures allow significant reduction of the plate thickness, and thus lighter structures. Such steels easily meet customer high strength requirements with satisfactory toughness, even at temperatures down to –60°C. Due to lack of supported complete design codes, and modest experience, these steels require further investigation. This paper outlines the results of standard tests of elastic-plastic fracture mechanics parameters, e.g. crack growth resistance curves, J-a, CTOD-a, as well as evaluation of critical material properties, JIc, CTODIc, and elastic fracture mechanics parameter KIc, for both, base and weld metal.

Keywords: high-strength quenched and tempered steels, elastic-plastic fracture mechanics parameters, welded joints, S690QL, S890QL

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