In order to analyze the anisotropic hardening behavior of metals, an off-axis torsion test by combined loading is developed. In this test, the maximum shear stress direction φ can be changed from 0 deg to 90 deg while the ratio of maximum and minimum principal stresses is kept at −1. With increasing angle φ, the yield stress of the torsional-prestrained steel decreases; the difference between the directions of the maximum shear stress and principal shear strain increment rises to a maximum value and then decreases. It is experimentally verified that anisotropy is more severe when a smaller offset strain is used in defining the yield stress.
Off-Axis Torsion Tests on Tubular Specimens of Steel
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division January 20, 2000; revised manuscript received March 11, 2001. Associate Editor: D. Marquis.
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Takeda, T., and Chen, Z. (March 11, 2001). "Off-Axis Torsion Tests on Tubular Specimens of Steel ." ASME. J. Eng. Mater. Technol. July 2001; 123(3): 268–273. https://doi.org/10.1115/1.1373651
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