Obrabotka Metallov 2014 No. 4

ОБРАБОТКА МЕТАЛЛОВ № 4 (65) 2014 92 ТРУДЫ КОНФЕРЕНЦИИ [Translated from Zhurnal prikladnoi mekhaniki i tekhnicheskoi fiziki. – 1980. – N 5. – P. 185–191]. 16. Формообразование монолитных вафельных панелей из сплава АК4-1 в режиме ползучести. Ти- повой технологический процесс: ОСТ 1–42388–88. – Введ. 01.07.1989. – М.: НИАТ, 1989. – 15 с. 17. Веричев С.H. Автоматизация проектирования геометрии рабочего контура при формообразовании монолитных панелей // Вопросы авиационной науки и техники. Серия: Авиационная технология. – 1988. – Вып. 2 (5). – C. 72–76. OBRABOTKAMETALLOV (METAL WORKING AND MATERIAL SCIENCE) N 4(65), October – December 2014, Pages 85–93 The shaping by bending of elements aircraft structures at plasticity conditions Verichev S.N. 1 , Ph.D. (Engineering), e-mail: kimt@ngs.ru Gorev B.V. 2 , D.Sc. (Engineering), e-mail: GorevBV@yandex.ru Banshchikova I.A. 2 , Ph.D. (Physics and Mathematics), e-mail: binna@ngs.ru 1 Novosibirsk State Technical University, 20 Prospect K. Marksa, Novosibirsk, 630073, Russian Federation 2 Lavrentyev Institute of Hydrodynamics of the Siberian Branch of the RAS, 15 Ac. Lavrentieva ave., Novosibirsk, 630090, Russian Federation Abstract The problem of inverse elastic-plastic calculation of predictive snap on the base of residual contour of the detail is solved with taking into account the elastic recovery after load removal for technology of shaping of large-sized finned panels. The form of the detail corresponds to a complex surface of double curvature with zones of convexity and concavity. Panel reinforcement ribs are under tension, compression and torsion during shaping. Preliminary test calculations of elastic-plastic bending at a temperature of 195 ºС of the t-shaped cross-section samples of alloy AK4-1T cut from the plate with the thickness h = 42mm showed satisfactory compliance to the experimental data. Such samples bending is simulation of the deformation of the stiffener with attached aircraft skin. An iterative method of calculation using finite element package ANSYS allowed to get close enough to practice form of detail surface, which can be considered as an initial approximation for developing the technology of shaping process in real conditions. Keywords : inverse elastic-plastic problem, shaping, aluminum alloy, bending, double sign-variable curvature. References 1. Guines D., Gavrus A., Ragneau E. Numerical modeling of integrally stiffened structures forming from creep age forming technique. International Journal of Material Forming , 2008, vol. 1, iss. 1, suppl., pp. 1071–1074. doi: 10.1007/s12289-008-0204-z 2. Yingying Zong, Po Liu, Bin Guo, Debin Shan. Springback evaluation in hot v-bending of Ti-6Al-4V alloy sheets. The International Journal of Advanced Manufacturing Technology , 2014, Published online. doi: 10.1007/ s00170-014-6190-z 3. Isakhanov G.V., Gulyar A.I., Maiboroda E.E. Computer simulation of the processes of mechanical shaping of three-dimensional shells under the conditions of creep. Pt. 2. Strength of Materials , 1997, vol. 29, iss. 5, pp. 495–502. doi: 10.1007/BF02767459 4. Yakovlev S.S., Larin S.N. Pravka rastyazheniem listovoi zagotovki iz anizotropnogo materiala v rezhime kratkovremennoi polzuchesti [Editing by stretching of sheet preparation from the anisotropic material in the mode of short-term creep]. Izvestiya TulGU. Tekhnicheskie nauki – Bulletin of Tula State University. Technical Sciences , 2013, no. 7-2, pp. 223–231.