HEAT GENERATION AND RESISTANCE TO DEFORMATION OF STRUCTURAL STEEL
Abstract
The purpose of this paper is to determine dependence between heat generation and resistance to deformation of structural steel.
It has been assumed on the basis of the represented data that in the course of deformation of structural steel physicochemical interactions of dislocations and impurity atoms occurring in the slip bands result in heat generation and temperature increase of product surface. Interdependence of heat generation and elastic-plastic deformation has been experimentally proved by set of experiments on low-carbon steel plate extension. In the case of deformation its intensity and rate are considered as main factors that determine local material heating in the pre-fracture nucleus and temperature directly exerts its influence on diffusion processes and changes in physical and mechanical characteristics of the material in the pre-fracture nucleus. The obtained average heating temperature for the pre-fracture nucleus is equal approximately (20–90)°С for low-carbon steel ВСт3сп while using quasi-static extension. The paper presents data pertaining to steel plate deformation that point to the fact that elastic-plastic deformation is accompanied by deformation heat generation and a crack initiation is caused by thermo mechanical process. Heat is formed in the slip bands and their direction corresponds to the maximum shearing stresses. Surface temperature in the zone of crack initiation has reached 88 °С in the pre-fracture stage.
The Davidenkov-Spiridonova formula has been derived while using a concept of "surface energy" and Laplace's formula. This formula makes it possible to determine resistance to deformation of a stretched round steel rod in the stage of neck formation. The paper shows formula’s dependence on the deformation heat generation.
About the Authors
A. E. Moyseychik
Belarusian National Technical Universit
Belarus
Graduate student
Belarus
Graduate student
Yu. V. Vasilevich
Belarusian National Technical Universit
Belarus
Belarus
Professor, PhD in Physics and Mathematics
References
1. Gubkin, S. I. (1961). Metal plastic deformation. Vol. 2: Physico-chemical theory of plasticity. Moscow, Metallurgizdat. 416 p. (in Russian).
2. Abramova, K. B., Shherbakov, I. P., Rusakov, A. I., Semenov, A. A. (1999). Emission processes, accompanying metal deformation and destruction. Fizika tverdogo tela [Solid-state physics], 41 (5), 842–843 (in Russian).
3. Hainike, G. (1987). Tribochemistry. Moscow, Mir. 584 p. (in Russian).
4. Budadin, O. N., Vavilov, V. P., Abramova, E. V. (2011). Heat control. Moscow, Spektr. 171 p. (in Russian).
5. Kliavin, O. V. (1987). Physics of crystal plasticity at helium temperatures. Moscow, Nauka. 256 p. (in Russian).
6. Thomson, W. (1857). On the Thermoelastic and Thermomagnetic Properties of Matter. Quart. J. of Math, 1, 57–77.
7. Horvath, L. (2002). Experimentelle Untersuchungen der im Stahlbau typischen Bauteile mit Thermovision. Dissertation zu Erlangung des Akademischen Grades Eines Doktor-Ingenieurs [Experimental investigations of the typical components in steel construction with thermal vision. Dissertation Doctor Engineer]. Cottbus. 84 p. (German).
8. Moyseychik, E. A. (2013). Investigations on heat generation and fracture initiation in steel expanded plate with design and technological defect. Prikladnaya mekhanika i tekhnicheskaya fizika [Applied Mechanics and Technical Physics], 1, 134–142 (in Russian).
9. Zaloga, V. ?., Krivoruchko, D. V., Khvostik, S. N. (2006). On selection of equation for state of material to be machined in order to simulate cutting process while using finite elements method. V?snik SumDU [Bulletin of Sumy State University], 12 (96), 101–115 (in Russian).
10. Davidenkov, N. N., Spiridonova, N. I. (1945). Analysis of stress state in expanded specimen neck. Zavodskaya laboratoria [Plant Laboratory], 6, 583–593 (in Russian).
11. Kutin, M., Risti?, S., Burzi?, Z., Puhari?, M. (2010). Testing the Tensile Features of Steel Specimens by Thermography and Conventional Methods. Scientific Technical Review, 60 (1), 66–70.
12. Lukin, ?. S. (2005). Investigations on limit state of structural steel according to thermoplastic effect. Author’s abstract of PhD thesis research. Yakutsk, Institute of Physico-Engineering Problems of the North of the Siberian Division of RAS. 23 p. (in Russian).
Review
For citations:
Moyseychik A.E., Vasilevich Yu.V. HEAT GENERATION AND RESISTANCE TO DEFORMATION OF STRUCTURAL STEEL. Science & Technique. 2015;(5):33-38. (In Russ.)
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