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RESEARCH PAPERS

The Influence of the Bauschinger Effect on the Yield Stress, Young’s Modulus, and Poisson’s Ratio of a Gun Barrel Steel

[+] Author and Article Information
J. Perry

Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel

M. Perl1

Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576

R. Shneck

Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel

S. Haroush

 Nuclear Research Center - Negev, P.O. Box 9001, Beer-Sheva, Israel

1

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

J. Pressure Vessel Technol 128(2), 179-184 (Dec 12, 2005) (6 pages) doi:10.1115/1.2172962 History: Received December 01, 2005; Revised December 12, 2005

The Bauschinger effect (BE) was originally defined as the phenomenon whereby plastic deformation causes a loss of yield strength restraining in the opposite direction. The Bauschinger effect factor (BEF), defined as the ratio of the yield stress on reverse loading to the initial yield stress, is a measure of the magnitude of the BE. The aim of the present work is to quantitatively evaluate the influence of plastic deformation on other material properties such as Young’s modulus and Poisson’s ratio for gun barrel steel, thus extending the definition of the Bauschinger effect. In order to investigate the change in this material’s properties resulting from plastic deformation, several uniaxial tension and compression tests were performed. The yield stress and Young’s modulus were found to be strongly affected by plastic strain, while Poisson’s ratio was not affected at all. An additional result of these tests is an exact zero offset yield point definition enabling a simple evaluation of the BEF. A simple, triphase test sufficient to characterize the entire elastoplastic behavior is suggested. The obtained experimental information is readily useful for autofrettage residual stress field calculations.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Single-specimen test cycling

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Figure 3

A single cycle of the multiple-specimens test

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Figure 4

Variation of tangent modulus during the cycling of a single specimen (first test)

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Variation of tangent modulus for three different total strains (second test)

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Figure 1

Typical loading-unloading loop

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Figure 6

Young’s modulus BEF as a function of plastic strain for various test conditions

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Poisson’s ratio curve based on ASTM definition

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Figure 8

Poisson’s ratio for a single-specimen cycling (first test)

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Figure 9

Poisson’s ratio for three different total strains (second test)

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Figure 10

The real proportional limit (RPL) point in tension

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Figure 11

The real proportional limit (RPL) point in compression

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Figure 12

Typical tension-compression YSBEF test loop

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Figure 13

The YSBEF curves for various plastic strains

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Figure 14

Stress-strain curves beyond the yield point in compression

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Figure 15

Elastic-plastic transition range (EPTR)

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Figure 16

Experimental and normalized tangent modulus YSBEF curves

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