Inertia Effects on the Ductile Failure of Thin Rings

[+] Author and Article Information
A. M. Rajendran

Aerospace Mechanical Division, University of Dayton Research Institute, Dayton, Ohio 45469

I. M. Fyfe

Department of Aero and Astro, University of Washington, Seattle, Wash. 98195

J. Appl. Mech 49(1), 31-36 (Mar 01, 1982) (6 pages) doi:10.1115/1.3162066 History: Received March 01, 1981; Revised September 01, 1981; Online July 21, 2009


The introduction of inertia terms into a theoretical model of thin ring expansion shows that classical plastic instability concepts, defined in terms of the local strain in the necking region, no longer apply. By introducing the role of void growth in triggering local necking, through a recently proposed constitutive equation for porous plastic materials, it is possible to overcome this difficulty. A criterion based on a critical void volume fraction provides the alternative means to predict failure. This theory was applied to a thin ring configuration, and the results were found to compare favorably with experimental values obtained from statically and dynamically loaded rings. The experimental techniques developed to handle the thin ring configuration are also described.

Copyright © 1982 by ASME
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