Mechanistic Prediction of Fracture Processes in Ferritic Steel Welds Within the Transition Temperature Regime

[+] Author and Article Information
E. P. Busso, Y. Lei, N. P. O’Dowd, G. A. Webster

Department of Mechanical Engineering, Imperial College, London SW7 2BX, United Kingdom

J. Eng. Mater. Technol 120(4), 328-337 (Oct 01, 1998) (10 pages) doi:10.1115/1.2807022 History: Received October 22, 1997; Revised February 23, 1998; Online November 27, 2007


This work examines the fracture behavior of ferritic steel welds in the transition temperature regime, where failure can occur either by ductile tearing or cleavage fracture. A computational and probabilistic-based mechanistic approach to cleavage fracture and ductile crack growth is adopted to model the fracture processes. The softening effect of ductile damage close to the crack tip is described by a Gurson-type material model. A statistical approach linked to both the Weibull stress and the initial void volume fraction is employed to determine the probability of cleavage fracture and the coupling between both fracture mechanisms. Finite element results are relied upon to interpret experimental fracture toughness data for the welds and to examine the effects of near crack tip damage and crack growth on the cleavage failure probabilities and cleavage and ductile fracture toughness distributions. The scatter in the weld experimental fracture toughness data is well reproduced by the proposed cleavage and ductile tearing models.

Copyright © 1998 by The American Society of Mechanical Engineers
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