Effect of Swift effect in finite torsion deformation on torsion constitutive models

Lihong Yang; Guangping Zou; Xueyi Zhang; Zhe Wang

doi:10.1117/12.839014

24 August 2009 Effect of Swift effect in finite torsion deformation on torsion constitutive models

Lihong Yang, Guangping Zou, Xueyi Zhang, Zhe Wang

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73750B (2009) https://doi.org/10.1117/12.839014
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

The determination of large strain isotropic hardening elasto-plastic constitutive model was studied by using solid circular shaft torsion test when taking into account Swift effect of specimen which showed permanent axial length changes in torsion of a solid shaft with free end. Jaumann stress rate of Kirchhoff stress was employed in large strain constitutive model. The deformation rate and Jaumann stress rate were derived, respectively, for free-end torsion deformation and fixed-ends torsion deformation of a solid circular shaft in the large strain range, and the plasticity rigidity function of constitutive model was formulated by the aid of the true shearing stress-shearing strain relationship, axial elongationshearing strain relationship and axial normal stress-shearing strain relationship obtained from solid circular shaft torsion test. The results show that both the axial elongation in free-end solid shaft torsion and the axial normal stress developed in fixed-ends solid shaft torsion has an effect upon large strain constitutive models, and the margin of the effect is mainly related to the slope of axial extension rate-shearing strain curve, the axial normal stress value and the slope of axial normal stress-shearing strain curve.

Citation Download Citation

Lihong Yang, Guangping Zou, Xueyi Zhang, and Zhe Wang "Effect of Swift effect in finite torsion deformation on torsion constitutive models", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73750B (24 August 2009); https://doi.org/10.1117/12.839014

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