Title: Fracture strain and void development in mild steel and weld metals

Authors: Y .W. Shi, D.H. Zhu, J.M. Fu

Addresses: Department of Mechanical Engineering, Xi'an Jiao-tong University, Xi'an, China. ' Department of Mechanical Engineering, Xi'an Jiao-tong University, Xi'an, China. ' Department of Mechanical Engineering, Xi'an Jiao-tong University, Xi'an, China

Abstract: To assess the effect of stress triaxiality on the plasticity and ductility of a mild steel and the associated weld metals, the tensile tests on notched round bar specimens were performed. The results indicated that the strains to initiate failure were strongly dependent on the stress state. Under the same triaxiality the failure initiation strain in the weld metal of E6015 low-hydrogen type electrode was the largest, and that of the E6013 lime-rutile type electrode was the smallest among the materials tested. The material constant C values relating to the void growth kinetics were given for the steel and weld metals. Moreover, it was determined that rapid void growth started to take place at different strains for the materials.

Keywords: ductility; fracture strain; mild steel; plasticity; void development; welding; weld materials; stress triaxiality; materials failure; void growth kinetics.

DOI: 10.1504/IJMPT.1989.036744

International Journal of Materials and Product Technology, 1989 Vol.4 No.4, pp.389 - 396

Published online: 06 Nov 2010 *

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