Vo Phan Thanh Dat, Petrov P.A., Burlakov I.A., Pham Van Ngoc, Nguyen Khanh Toan, Gnevashev A.A. Obtaining Rheological Models of Aluminum Alloy RS-356 under Various Deformation Modes

DOI: 10.18503/1995-2732-2023-21-3-78-88

Abstract

The paper presents a comparative analysis of the use of rheological models with 5 and 9 coefficients based on the Hensel-Spittel empirical formula. The material under study is a new aluminum alloy, RS-356 (Al – 92.58; Si – 6.83; Mg – 0.29; Mn – 0.002; Fe – 0.14; Ti – 0.15; Cu – 0.002; Zn – 0.003), workpieces from which are formed by selective laser melting. The values of the unknown coefficients were determined by carrying out full-scale and computational experiments, namely a method for solving the inverse problem, as well as using an original method for processing the results of the full-scale experiment. The full-scale experiment was carried out by testing cylindrical specimens of alloy RS-356 under study for compression in the temperature range from 20 to 450 ℃ at constant strain rates of 0.001, 0.01 and 0.4 s-1. The specimens with a diameter of 10 mm and a height of 10 mm were produced by electroerosion from workpieces of the RS-356 alloy. The computational experiment was carried out using the QFORM software package; values of unknown coefficients in rheological models – applying Matlab software. Accuracy of the values of the coefficients in each of the obtained models is estimated by coefficient of determination R2. So, regarding a model with 9 coefficients, R2 = (0.95-0.97) depending on the temperature interval. The established dependencies with 9 coefficients for describing the rheological properties of RS-356 provide accuracy of predicting force parameters, when modeling the plastic deformation process within 5% and can be used in computer modeling of metal forming operations for a temperature range of 20-450 ℃ and strain rates of 0.001, 0.01 and 0.4 s-1.

Keywords

RS-356 aluminum alloy, compression test, Hensel-Spittel rheological model, yield curve, deformation stress model

For citation

Vo Phan Thanh Dat, Petrov P.A., Burlakov I.A., Pham Van Ngoc, Nguyen Khanh Toan, Gnevashev A.A. Obtaining Rheological Models of Aluminum Alloy RS-356 under Various Deformation Modes. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2023, vol. 21, no. 3, pp. 78-88. https://doi.org/10.18503/1995-2732-2023-21-3-78-88

Vo Phan Thanh Dat – postgraduate student of the Department of Materials Forming and Additive Technologies, Moscow Polytechnic University, Moscow, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

Pavel A. Petrov – PhD (Eng.), Associate Professor of the Department of Materials Forming and Additive Technologies, Moscow Polytechnic University, Moscow, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

Igor A. Burlakov – DrSc (Eng.), Professor of the Department of Materials Forming and Additive Technologies, Moscow Polytechnic University, Moscow, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

Pham Van Ngoc – postgraduate student of the Department of Materials Forming and Additive Technologies, Moscow Polytechnic University, Moscow, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

Nguyen Khanh Toan – postgraduate student of the Department of Materials Forming and Additive Technologies, Moscow Polytechnic University, Moscow, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

Andrey A. Gnevashev – postgraduate student of the Department of Materials Forming and Additive Technologies, Moscow Polytechnic University, Moscow, Russia, Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

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