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TECHNICAL PAPERS

Off-Axis Torsion Tests on Tubular Specimens of Steel

[+] Author and Article Information
Takenobu Takeda, Zhongchun Chen

Department of Mechanical Systems Engineering, Faculty of Engineering, Yamagata University, Yamagata, Japan

J. Eng. Mater. Technol 123(3), 268-273 (Mar 11, 2001) (6 pages) doi:10.1115/1.1373651 History: Received January 20, 2000; Revised March 11, 2001
Copyright © 2001 by ASME
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References

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Takeda,  T., and Chen,  Z., 1999, “Yield Behavior of a Mild Steel after Prestraining and Aging under Reversed Stress,” Metall. Mater. Trans. A, 30A, pp. 411–416.
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Figures

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Thin-walled tubular specimen (dimensions in mm)
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Schematic illustration of equivalent stress-equivalent plastic strain curves showing preloading, unloading and reloading
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Coordinate system of stress components and off-axis torsion by combined loadings: (a) a state of plane stress in the original coordinate system, (b) a state of plane stress in the rotated coordinate system, and (c) the relation between principal stress and maximum shear stress in off-axis torsion
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Equivalent stress-equivalent plastic strain curves for prestrained steel, obtained from reloading tests in off-axis torsion
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Variation of yield stress with maximum shear stress direction, showing work hardening, planar anisotropy and the Bauschinger effect
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Variation of normalized yield stress with maximum shear stress direction for prestrained steel. The yield stress at each direction is normalized by the offset strength in forward torsion, τf.
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Plastic strain paths in εxp−εyp and εxp−γxyp planes for prestrained steel under reloadings in off-axis torsion
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Variation of principal shear strain increment direction φ with maximum shear stress direction φ. The deviation φ−φ gives a measure of anisotropy based on strain behavior.
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Loading paths in σx−3τxy plane
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Initial yield locus and subsequent equi-strain loci in σx−3τxy plane. The arrows indicate the strain increment vectors corresponding to angle ψ=tan−1{(dγxy2p/3)/dεx2p}.

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