The process of ductile fracture during metalforming was modeled by deforming plasticine specimens which contained steel-wire segments to simulate the inclusions in a fully plastic matrix. Due to the strain-rate-sensitive characteristics of plasticine, slant shearing from inclusion was found to be the dominant mechanism in fracture initiation at deformation rate of 10−4 s−1. As strain rate increased to 10−1 s−1, this shearing crack transformed into tearing cracks normal to the maximum tensile stress. These two basic modes of fracture, slant shearing and normal tearing, were further substantiated by the process of void coalescence, depending on inclusion morphology and matrix characteristics. These fracture behaviors were explained by a predictive model based on plastic instability of the deforming matrix and were evidenced by real metallic material. A qualitative criterion is proposed to depict the mode transition in ductile fracture as a function of inclusion morphology and matrix material characteristics.
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July 1990
Research Papers
Physical Modeling of Ductile Fracture During Metalforming Process
A. S. Kao,
A. S. Kao
IBM Research Division, Almaden Research Center, San Jose, CA 95120-6099
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H. A. Kuhn
H. A. Kuhn
University of Pittsburgh, Pittsburgh, PA 15261
Search for other works by this author on:
A. S. Kao
IBM Research Division, Almaden Research Center, San Jose, CA 95120-6099
H. A. Kuhn
University of Pittsburgh, Pittsburgh, PA 15261
J. Eng. Mater. Technol. Jul 1990, 112(3): 302-308 (7 pages)
Published Online: July 1, 1990
Article history
Received:
December 13, 1988
Revised:
September 7, 1989
Online:
April 29, 2008
Citation
Kao, A. S., and Kuhn, H. A. (July 1, 1990). "Physical Modeling of Ductile Fracture During Metalforming Process." ASME. J. Eng. Mater. Technol. July 1990; 112(3): 302–308. https://doi.org/10.1115/1.2903328
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