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research-article

Selecting Material Properties that Maximize Gun Firing Power

[+] Author and Article Information
Mordechai Perl

Aaron Fish Professor of Mechanical Engineering-Fracture Mechanics. On sabbatical leave from the Pearlstone Center for Aeronautical Engineering Studies , Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.
merpr01@bgu.ac.il

Joseph Perry

Fellow ASME, Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
josephperry@bezeqint.net

1Corresponding author.

ASME doi:10.1115/1.4037121 History: Received November 26, 2016; Revised June 09, 2017

Abstract

The design of a gun barrel aims at maximizing its firing power, determined by its SMP- the maximal allowed firing pressure - which is considerably enhanced by inducing a favorable residual stress field through the barrel's wall commonly by the autofrettage process. Presently, there are two distinct processes: hydrostatic and swage autofrettage. In both processes the barrel's material is fully or partially plastically deformed. A new 3-D code, enabling a realistic simulation of both swage and hydraulic autofrettage processes, using experimentally measured stress-strain curves and incorporating the Bauschinger effect is used. This code enables the analysis of all the factors relating to the final SMP of a barrel, and can be used to optimize the barrel's design. A major outcome of this analysis was the fact that the SMP of an autofrettaged barrel is dictated by the detailed plastic characteristics on the barrel's material. The main five plastic parameters of the material that have been identified are: the exact (zero offset) value of the yield stress, the universal plastic curve in both tension and compression, the Bauschinger Effect Factor (BEF) curve, and the Elastic-Plastic Transition Range (EPTR). A detailed analysis of these three materials points to the fact that the major parameter determining the barrel's SMP is the yield stress of the material and that the best way to determine it is by the newly developed "zero offset" method.

Copyright (c) 2017 by ASME
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