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RESEARCH PAPERS: Papers on Production Engineering

Plastic Flow Instability Under Compressive Loading During Shear Spinning Process

[+] Author and Article Information
Micha Gur

RAFAEL, Armament Development Authority, Ministry of Defense, Haifa, Israel

Jehuda Tirosh

Technion, Haifa, Israel

J. Eng. Ind 104(1), 17-22 (Feb 01, 1982) (6 pages) doi:10.1115/1.3185791 History: Received August 02, 1979; Revised June 01, 1980; Online July 30, 2009

Abstract

The sudden appearance of a material bulge beneath the roller during tube spinning operation (referred to as “plastic instability”) is considered experimentally and examined quantitatively via an upper bound analysis. The phenomenon is explained by a sudden transfer of flow from one admissible mode to its competing mode when an external condition (or few conditions) is changed in a certain way to be discussed (e.g., increasing the roller angle of attack, increasing the initial tube thickness, etc.). As a by-product, the interrelation between the dominant variables of the process emerges. The associated formulation with its inherent idealizations enables one to mark the line between favorable and unfavorable working conditions of the spinning process. Experimental evidence demonstrates the utility of the proposed approach.

Copyright © 1982 by ASME
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