Abstract
The ductile fracture of structural steel including weldment can be described as a progressive process with void nucleation, growth and coalescence. The effects of mechanical heterogeneity of the weldment were investigated experimentally on the ductile fracture behaviors of the base metal and the weld metal using round-bar tensile notched bars. The results show that the mechanical heterogeneity of weldment has certain effects on fracture strain, stress triaxiality at fracture, critical void growth and the material constant C. The smaller the distance between the notch root and the fusion line, the larger the fracture stain, the smaller the stress triaxiality and the larger the critical void growth rate.
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