n111289SE Academic Article uri icon

abstract

  • 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. 2000 Elsevier Science Ltd.

published proceedings

  • Engineering Fracture Mechanics

author list (cited authors)

  • Tvergaard, V., & Needleman, A.

publication date

  • January 1, 2000 11:11 AM