24 August 2009 Determination and analysis of torsion equivalent stress-equivalent strain relation of low carbon alloy
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Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73750O (2009) https://doi.org/10.1117/12.839029
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China
Abstract
Typical pressure vessel materials' torsion equivalent stress-equivalent strain relationships under large deformation condition are researched in this paper. Because the length and the diameter of the specimen may change under uniaxial tension, it's impossible to make effective measurement and analysis for the mechanical properties of the specimen, especially after the necking. The form and cross-section size of cylindrical specimen do not change in torsion test, so that the large strain's constitutive relationship is more accurate than that obtained from an axial tension test. So that cylindrical specimen's torsion test is attempted to obtain the shear stress-shear strain curves of typical pressure vessel materials 16MnR and Q235. Consider that the stress is non-homogeneous in the cross-section of cylindrical specimen, thin wall tube specimen is also used in the torsion test, and the maximum differences between cylindrical specimen's results and thin-wall tube's are 10% and 13% respectively. Tension true stress-true strain curves, torsion equivalent stress-equivalent strain curves are also compared in this paper and the results showed that description of the torsion constitutive relationship is more complete than that of tension. At last, constitutive equations are fitted and the mathematical representations are obtained.
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Jing Wang, Gongfeng Jiang, Xiutao Yu, Tianhua Deng, Yiliang Zhang, "Determination and analysis of torsion equivalent stress-equivalent strain relation of low carbon alloy", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73750O (24 August 2009); doi: 10.1117/12.839029; https://doi.org/10.1117/12.839029
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