FINITE-ELEMENT MODELING OF WELDED X-SHAPED JOINT
Abstract
The paper presents a modeling of non-stationary processes while making arc welding in the shielding gas medium of X-shaped joints which consist of re-bars having various diameters. Changes and specific features of stress-strain state in the X-shaped joint have been considered in the paper. Calculations are as much as possible approximated to a real situation: a 3D-geometrical and finite-element model is used, the problem is considered as elastic and contact one with due account of power loading. An analysis of the welded assembly consisting of re-bars with diameter of 4-10 mm has been performed using a finite element method. Computation of a welded connection with due consideration of geometrical nonlinearity has been done in the paper. It has been shown that tensile of re-bars under load causes uneven stress distribution in a welded joint and their significant concentration is observed at crossing points from the welded joint to a base metal. An analysis of the obtained equivalent stresses at nodes and details of the welded joint structure has shown that they did not exceed permissible values for all diameters in case of the considered loading conditions. A comparison of stress values calculated has been carried out in accordance with the proposed method and experimentally obtained data. It has been revealed that application of tensile load (determined experimentally) to the connection stress values at the connection and welded joint boundary reach an yield strength and subsequently it causes destruction of the connection. It has been established that the margin of safety for such type of connections is averagely equal from 30 to 60 %. The submitted calculated data are in full agreement with experimental data that proves correctness in selection of calculation schemes and loads.
References
1. Kharevich, T. V. (2012). Organization of welding production: nowadays. Respublikanskaya stroitelnaya gazeta [Republican Construction Newspaper], 24 (477), 6 (in Russian).
2. Kurkin, A. C. Priamoe matematicheskoe modelirovanie protsessa razrusheniia svarnykh konstruktsii dlia opredeleniia ikh prochnosti i treshchinostoikosti. Dis. d-ra tekhn. nauk [Direct mathematical modeling of destruction process in welded structures for determination of their strength and crack-resistance. Dr. tech. sci. diss.]. Moscow, 1997. 250 p. (in Russian).
3. Vrubleuskaya, V. V., Vasiliev, A. A., Gursky, D. M. (2013). Investigation of cross-shaped connections of steel-rebars having small diameter which made made with the help of arc welding by semi-automatic machine in the active gas medium. Vestnik Polotskogo gosudarstvennogo universiteta. Seriia B. Promyshlennost'. Prikladnye nauki. [Bulletin of the Polotsk State University. Series.B. Industry. Applied Sciences], 3, 35–41 (in Russian).
4. Gorodetsky, A. S., Evzerov, I. D. (2009). Computer model of structures. Moscow, Publishing House of Association of Construction HEIs. 360 p. (in Russian).
5. Erdedi, N. A., Erdedi, A. A. (2012). Material resistance. Moscow, KnoRus. 160 p. (in Russian).
6. Bleshchik, N.P., Zhukov, D.D., Lazovskii, D.N., Kazachek, V.G., Kondratchik, A.A., Petsol'd, T.M., Podobed, D.P., Rak, N.A., Tur, V.V., Shubert, I.M. (2003). Reinforced concrete structures. Fundamentals of theory, calculation and designing. Brest: Brest State Technical University. 380 p. (in Russian).
7. Tchigarev, A. V., Kravchuk, A. S., Smaliuk, A. F. (2004). ANSYS for engineers. Moscow, Mashinostroenie. 512 p. (in Russian).
8. STB 2174–2011. Reinforcement welded units for reinforced concrete structures. Technical specifications. Minsk: Gosstandart, 2011. 46 p. (in Russian).
9. Vrubleuskaya, V. V., Shimanovsky, A. O., Vasiliev, A. A. (2013). Computer modeling of stressed-deformed state of re-bar joint connection. Stroitelnaya Nauka i Tekhnika [Construction Science and Technology], 2, 60–63 (in Russian).
10. Vrubleuskaya, V., Shimanovsky, A. (2013). Computer modeling of the Welded Rebars Joint Stress-Strain Condition. Technolog. Žilin: Žilinska univerzita, 4, 259–261.
Review
For citations:
Kyzniatsova V.V. FINITE-ELEMENT MODELING OF WELDED X-SHAPED JOINT. Science & Technique. 2014;(5):74-81. (In Russ.)
Views:
677
Email this article 