 | | Mechanics of Solids
A Journal of Russian Academy of Sciences | | Founded
in January 1966
Issued 6 times a year
Print ISSN 0025-6544
Online ISSN 1934-7936 |
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| Total articles in the database: | | 12804 |
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| In English (Mech. Solids): | | 4760 |
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| V.N. Kukudzhanov and A.V. Kolomiets-Romanenko, "A Model of Thermoelectroplasticity of Variations in the Mechanical Properties of Metals Based on Defect Structure Reorganization under the Action of Pulse Electric Current," Mech. Solids. 46 (6), 814-827 (2011) |
| Year |
2011 |
Volume |
46 |
Number |
6 |
Pages |
814-827 |
| DOI |
10.3103/S0025654411060021 |
| Title |
A Model of Thermoelectroplasticity of Variations in the Mechanical Properties of Metals Based on Defect Structure Reorganization under the Action of Pulse Electric Current |
| Author(s) |
V.N. Kukudzhanov (Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences, pr-t Vernadskogo 101, str. 1, Moscow, 119526 Russia, kukudz@ipmnet.ru)
A.V. Kolomiets-Romanenko (Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences, pr-t Vernadskogo 101, str. 1, Moscow, 119526 Russia, kolomiets@ipmnet.ru) |
| Abstract |
We consider variations in the mechanical properties of prestrained samples made of metallic materials with defects like microcracks and micropores under the action of pulse high-energy electric currents of certain intensity and duration. It was experimentally shown [1-5] that the treatment with a high-energy electromagnetic field of a prestretched sample with defects like microcracks that are located normally to the sample tension axis increases the sample limit plastic strain, which simplifies the treatment of hard-to-deform alloys in various technological processes. We consider a slow quasi-stationary process of thermal-electric treatment of samples, which permits obtaining materials with desired mechanical properties including samples with a high limit plastic strain.
We propose a thermoelectroplastic model of a material which takes account of the defect structure changes arising under the action of an electromagnetic field and develop a method for solving this problem by a direct numerical simulation based on the use of representative finite elements containing defects of the required type.
It is shown that, under the action of electric current, a nonhomogeneous temperature field with temperature localization arises near microcracks in the sample, and this leads to the "collapse" of defects and, as a consequence, to hardening of the material. On the other hand, the material melting and pore formation occur because of the temperature localization at the microcrack ends. An increase in the porosity results in a decrease in the nominal yield strength and an increase in the material limit plasticity. The mechanical properties obtained under such a reorganization of the defect structure significantly vary depending on the parameters of the pulse electric current and, hence, can be controlled.
The revealed mechanism of defect structure reorganization under the action of a thermal-electric field permits explaining the experimentally observed variations in the thermoelectromechanical properties of the material and using the simulation results to develop technological methods of metal treatment. |
| Keywords |
thermoelectroplasticity, direct numerical simulation, material structure with defects, electric field temperature localization |
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|
| Received |
20 July 2011 |
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