The Paton Welding Journal, 2009, №01



2009 №01 (01)

2009 №01 (03)

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TPWJ, 2009, #1, 6-11 pages

APPLICATION OF MATHEMATICAL MODELLING IN THERMAL STRAIGHTENING OF SHIPBUILDING PANELS

Journal                    The Paton Welding Journal
Publisher                 International Association «Welding»
ISSN                       0957-798X (print)
Issue                       № 1, 2009 (January)
Pages                       6-11
 
 
Authors
O.V. MAKHNENKO¹, A.F. MUZHICHENKO¹ and P. SEYFFARTH^2
1E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
²IMG GmbH, Rostock, Germany
 
 
Abstract
Described is an example of application of mathematical modelling for investigation of the efficiency of the process of thermal straightening of shipbuilding panels, based on the approach of a combined use of the general thermoplasticity method and approximate shrinkage function method. It is shown that the approach suggested is particularly efficient for prediction of general distortions of large-size spatial structures in the case of a large number of welds contained in them or of local heatings used for straightening. The results of experiments on thermal straightening of shipbuilding panels with buckling distortions have been analysed, and objective factors limiting the efficiency of this technological operation, especially with large thicknesses of the panels, have been revealed.
 
 
Keywords: thin-sheet welded structures, shipbuilding panels, welding distortions, thermal straightening, mathematical modelling, thermoplasticity method, shrinkage function method
 
 
Received:                21.03.08
Published:                28.01.09
 
 
References
1. Paton, E.O., Gorbunov, B.N., Bernshtejn, D.I. et al. (1936) Shrinkage stresses in welding of cylindrical vessels. Avtogennoe Delo, 5/6.
2. Podstrigach, Ya.S., Plyatsko, G.V., Osadchuk, V.A. (1971) On determination of welding residual stresses in cylindrical shells. Avtomatich. Svarka, 3, 50-58.
3. Ueda, Y., Yuan, M.G. (1991) The characteristics of the source of welding residual stress (inherent strain) and its application to measurement and prediction. Transact. of JWRI, 20(2), 119-127.
4. Makhnenko, V.I., Lobanov, L.M., Makhnenko, O.V. et al. (1991) Prediction of general deformations of welded units by using the database on transverse and longitudinal shrinkage, and angular deformations of appropriate samples. Avtomatich. Svarka, 10, 1-5.
5. Lobanov, L.M., Makhnenko, O.V., Sayfferth, P. (1997) Design prediction of welding deformations in production of flat sections with the purpose of decrease of fitting operations. Ibid., 1, 21-24.
6. Makhnenko, V.I., Lobanov, L.M., Makhnenko, O.V. (1998) Problem-oriented software package for prediction of welding stresses and distortions with reference to the solution of various questions of formation. Weldability and accuracy of welded structures. IIW Doc. X/XV-RSD.
7. Luo, Y., Deng, D., Xie, L. et al. (2004) Prediction of deformation for large welded structures based on inherent strain. Transact. of JWRI, 33(1), 65-70.
8. Liang, W., Shinji, S., Tejima, M. et al. (2004) Measurement of inherent deformations in typical weld joints using inverse analysis. Pt 1: Inherent deformation of bead on welding. Ibid., 33(1), 45-51.
9. Kuzminov, S.A. (1974) Welding deformations of ship hull structures. Leningrad: Sudostroenie.
10. Vinokurov, V.A., Grigoriants, A.G. (1984) Theory of welding strains and stresses. Moscow: Mashinostroenie.

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