1st European Mechanics of Materials Conference on Local Approach to Fracture '86 - 96'
J. Phys. IV France 06 (1996) C6-315-C6-323
Prediction of Fracture in the Transition Regime : Application to an A533B Pressure Vessel SteelC. Eripret1, D.P.G. Lidbury2, A. Sherry2 and I. Howard3
1 Electricité de France, Research Division, Fracture Mechanics Group, Les Renardières Research Centre, 77250 Moret-sur-Loing, France
2 AEA Technology, Structural Performance Department, Risley, Warrington, Cheshire WA3 6AT, U.K.
3 SIRIUS, University of Sheffield, Department of Mechanical and Process Engineering, Mappin Street, Sheffield, S1 3JD, U.K.
In order to model the fracture behaviour of pressure vessel steels in the transition regime, a new model has been developped in 1991 at EDF R&D Division in the framework of local approach to fracture. This approach couples the damage mechanics model developped by Rousselier which is accounting for ductile propagation of a crack, and the Beremin's model based on Weibull's statistics which stands for cleavage. It is possible to predict, by this coupled approach, safe lower bound transition curves for a temperature range up to RTNDT+50°C. It has been shown that the predictions of the model agree well with the experimental data, both in terms of fracture toughness at cleavage instability and the amount of pre-cleavage tearing. Those predicted curves have also been compared to the ASME design curve, and substantial safety margins have been exhibited.
© EDP Sciences 1996