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New developments of Tula State University
Название Understanding how deformation rate influences the resistance to deformation under static tension at high temperature
DOI 10.17580/tsm.2019.05.07
Автор Chernyaev A. V., Usenko N. A., Korotkov V. A., Platonov V. I.
Информация об авторе

Tula State University, Tula, Russia:

A. V. Chernyaev, Professor at the Department of Mechanics of Plastic Forming (MPF), e-mail: sovet01tsu@rambler.ru
N. A. Usenko, Professor at the Department of MPF
V. A. Korotkov, Senior Researcher at the Department of MPF
V. I. Platonov, Associate Professor at the Department of MPF


This paper examines how to enhance the efficiency of research into uniaxial tensile deformation of material at high temperature in order to establish a relationship between the intensity of stresses and the deformation degree and rate using the case study of an aluminium alloy. As part of comprehensive experimental research, flat specimens are heated to the required temperature and stretched. To achieve this, actuators have to move at different rates, which makes it a labour-intensive process. To enhance the efficiency of experimental research, the authors propose a technique for stretching one flat specimen in a given temperature regime. During the entire stretching period, a cyclic speed change was applied after every 2–3 mm of the grip’s travel. The changing rates of deformation entailed stepwise changes in the acting forces, and a bar ‘load-travel’ graph was built. After the uniaxial tension test was completed, the bars in the graph were connected with smooth lines producing a few curves in one graph. The stepwise change of speed during the tension testing of one specimen in given temperature regime helps establish a relationship between the intensity of stresses and the strain intensity at different deformation rates. The proposed testing technique helps significantly reduce the number of specimens used, reduce the time required for experimental research, and eliminate possible errors in research results caused by heating inaccuracies as it is quite difficult to ensure identical temperatures when conducting separate tests with several specimens.

Ключевые слова Tension, stress, deformations, temperature, specimen, tests, resistance to deformation
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