KnE Engineering
ISSN: 2518-6841
The latest conference proceedings on all fields of engineering.
Evaluation the Applicability of the New Torsion Testing Method to Study the Rheological Properties of Materials in a Cold State
Published date: Apr 15 2019
Journal Title: KnE Engineering
Issue title: XIX International scientific-technical conference “The Ural school-seminar of metal scientists-young researchers”
Pages: 223–230
Authors:
Abstract:
The most important parameter characterizing the rheological properties of steels and alloys is the strain resistance. The new method of testing cylindrical specimens for torsion with variable grip’s acceleration proposed (application No. 2018132149 of 07.09.2018 for the patent of the Russian Federation for the invention). This method is designed to study the rheological properties of steels and alloys mainly in a hot state. However, this method is universal and can be used to determine strain resistance of materials in a cold state. The article is devoted to the applicability evaluation of the proposed torsion testing method to study the rheological properties of materials in a cold state. It’s done on a basis of the comparison of the hardening curves obtained during the testing of specimens for tensile and torsion. The CrWMn steel was used. The results show that the hardening curves obtained during the torsion and tensile tests are close, and the yield stress values differ by about 3%. It can be assumed that the developed method of torsion testing allows to obtain reliable values of the material’s strain resistance in a cold state.
Keywords: hardening curves, strain resistance, torsion test, tensile test, test control, post-processing, experimental laboratory setup
References:
[1] A. Nadai, Theory of flow and fracture of solids, Volume II, McGraw-Hill Bool Company, Inc., New York, 1963.
[2] D.F. Fields, W.A. Backofen, Determination of strain-hardening characteristics by torsion testing, in: Proceedings of the 6th annual meeting of the society, ASTM Proceeding, 1957, pp. 1259-1272.
[3] S. Khoddam, P.D. Hodgson, Post processing of the hot torsion test results using a multi-dimensional modelling approach, Materials & design. 31-5 (2010) 2578-2584.
[4] J.J. Jonas, F. Montheillet, L.S. Toth, C. Ghoh, Effects of varying twist and twist rate sensitivities on the interpretation of torsion testing data, Materials Science & Engineering. 591 (2014) 9-17.
[5] T. Sheppard, D.S. Wright, Determination of flow stress: Part 1. Constitutive equation for aluminum alloys at elevated temperatures, Metals Technology. 6 (1979) 215-223.
[6] K. Laber, A. Kawalek, S. Sawicki, H. Dyja et.al., Application of torsion test for determination of rheological properties of 5019 aluminium alloy, Key Engineering Materials. 682 (2016) 356-361.
[7] Yu.N. Loginov, S.L. Demakov, A.G. Illarionov, and A.A. Popov, Effect of the Strain Rate on the Properties of Electrical Copper, Russian Metallurgy (Metally). 2011-3 (2011) 194- 201.
