The Influence of Stress-State and Inclusion Content on Ductile Fracture With Rotation

[+] Author and Article Information
V. A. Tipnis

Republic Steel Research Center, Cleveland, Ohio

N. H. Cook

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass.

J. Basic Eng 89(3), 533-540 (Sep 01, 1967) (8 pages) doi:10.1115/1.3609654 History: Received January 24, 1967; Online November 03, 2011


A study of flow and fracture under combined shear and normal stresses in deformation regions with rotations was undertaken using tubular specimens. The results of the microscopic study for the four resulfurized steels tested show that rotations play an important role in ductile fracture at inclusions even when the mean normal stress is compressive. Two mechanisms for ductile fracture with rotation are proposed. On the gross scale a relationship is found between the fracture strain and the stress state for a given inclusion content. Also, a strong inverse dependence of fracture strain on inclusion content is obtained. These results appear useful to determine limiting shear deformation in metal processing operations.

Copyright © 1967 by ASME
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