Analysis of the Charpy V-notch test for welds

Viggo Tvergaard, A. Needleman

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    The ductile-brittle transition for a weld is investigated by numerical analyses of Charpy impact specimens. The material response is characterized by an elastic-viscoplastic constitutive relation for a porous plastic solid, with adiabatic heating due to plastic dissipation and the resulting thermal softening accounted for. The onset of cleavage is taken to occur when a critical value of the maximum principal stress is attained. The effect of weld strength undermatch or overmatch is investigated for a comparison material, and analyses are also carried out based on experimentally determined flow strength variations in a weldment in a HY100 steel. The predicted work to fracture shows a strong sensitivity to the location of the notch relative to the weld, with the most brittle behavior for a notch close to the narrow heat affected zone. The analyses illustrate the strong dependence of the transition temperature on stress triaxiality. (C) 2000 Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    JournalEngineering Fracture Mechanics
    Issue number6
    Pages (from-to)627-643
    Publication statusPublished - Apr 2000


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