A Fracture Criterion for Porous Materials and Its Application to the Shape of Sintered Preforms in Forging

[+] Author and Article Information
T. Tabata, S. Masaki

Department of Mechanical Engineering, Osaka Institute of Technology, Asahi-ku, Osaka, Japan

J. Eng. Mater. Technol 99(1), 16-22 (Jan 01, 1977) (7 pages) doi:10.1115/1.3443395 History: Received September 19, 1975; Revised January 20, 1976; Online August 17, 2010


Ductile fracture of porous metals during forging was studied. The effect of the shape of sintered copper preforms on the forming limit is examined in upsetting with flat dies at room temperature. Cylindrical preforms with concave ends were found to show less barrelling during deformation and had a larger upsetting limit compared to those with flat ends. A fracture criterion for porous materials was proposed as a function of the history of the hydrostatic component of the stress. The criterion was applied to upsetting of sintered copper preforms. For calculation of the forming limit, the histories of the stress components at the equatorial free surface were obtained applying the plasticity equations for porous materials. The change in the density distribution during upsetting was measured.

Copyright © 1977 by ASME
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