Experimental analysis and simulation of effective factors on explosive forming of spherical vessel using prefabricated four cones vessel structures
Tóm tắt
Construction of spherical vessel in various dimensions is known as one of the frequent problems for construction and production engineers, since conventional methods of shell construction require mold and press which leads to higher costs of production. Therefore, current work has tried to investigate a new method based on explosive forming without using molds. In this technique, final shape of the shell can be achieved by explosion inside a prefabricated structure called four cones. This structure is produced from combination and welding of four truncated cones two of which are paired in each side. Initial shape of the tank is then used to transform this structure into a more complete sphere using explosives at its center. This paper aims to study the amount of explosives needed for this process in terms of vessel’s diameter and thickness. In this regard, simulation was run by LS-DYNA software and the resultant outputs were evaluated with those of experimental tests. The results shows that the required charge of forming varies exponentially with thickness.
Tài liệu tham khảo
Zhang T., Explosive forming of spherical metal vessel without die, Journal of material processing technology, 31 (1992) 135–145
Akbari Mosavi A. A., Joodaki G., Explosive Welding Simulation Of Multi-Layer Tubes, Proc. Of VIII Intl Conf Computational Plasticity, Barcelona, 2005
ASME Boiler & Pressure Vessel Codes Sec II & III V div 1
Johnson G.R., Cook W.H., A constitutive model and data for metalssubjected to large strains, high stain rates and high temperatures, in: Pro-ceedings of the Seventh International Symposium on Ballestics, The Hague, The Netherlands, 1983, 541–547
Lstc., Ls-Dyna., Non-Linear Dynamic Analysis Of Structures In Three Dimensions, Version 971, Theoretical Manual, Live More Software Technology Corporation, June 2002
Lee E., Finger M., Collinsm W., JWL Equation of State Coef[U+FB01]cient for High Explosives, Lawrence Livermour National Laboratory Report, UCID-16189, 1973
McQeen G., Marsh S.P.T., Taylor J.W., Fritz J.N., et al., The Equation of State of Solids from Shock Wave Studies, 1970
Akbari Mosavi A.A., Riahi M., Hagh Parast A., Experimental and Numerical Analysis Of Explosive Free Forming, Journal Of Material Processing Technology, vol. 187–188, pp. 512–516, 2007
Fengman H., Zheng T., Ning W., Zhiyong H., Explosive forming of thinwall semi-spherical parts, Mater. Lett. 45 (2000) 133–13
Zhang R., Iyama H., Fujita M., Zhang T.S., Optimum structure design method for non-die explosive forming of spherical vessel technology, J.Mater. Process. Technol. 85 (1999) 217–219
Tong Z., Precision control of explosive forming for metallic decorating sphere, journal of materials processing technology 203 (2008) 449–453
Zamani E., Liaghat G., Explosive welding of stainless steel-carbon steel coaxial pipes, Journal of Material Science, 47 (2012) 685–695