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RESEARCH PAPERS

The Split, Layered, Cup-and-Cone Tensile Fracture

[+] Author and Article Information
R. J. Hrubec, L. A. Jackman, W. R. Clough

Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, N. Y.

J. Basic Eng 90(1), 8-12 (Mar 01, 1968) (5 pages) doi:10.1115/1.3605069 History: Received August 14, 1967; Online November 03, 2011

Abstract

Quenched and tempered plate steel is capable of modified cup-and-cone fractures involving one or more longitudinal cracks “parallel” to the flat plate surfaces. The occurrence was verified by tensile testing of three steels at a variety of temperatures. Electron fractography revealed that quasi-cleavage, shear lips, tearing, and normal rupture were active, being identified by modified river patterns and by elongated and equiaxed dimples resulting from the coalescence of microvoids. The brittle longitudinal cracks are formed shortly before final rupture. Application of the Bridgman plasticity solution for necked tensile specimens shows that the split, layered, fracture occurs under unique stress conditions.

Copyright © 1968 by ASME
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