As energy crisis and environment pollution all around the world threaten the widespread use of fossil fuels, compressed natural gas (CNG) vehicles are explored as an alternative to the conventional gasoline powered vehicles. Because of the limited space available for the car, the composite pressure vessel (Type Ⅱ) has been applied to the CNG vehicles to reach large capacity and weight lightening vehicles. High pressure vessel (Type Ⅱ) is composed of a composite layer and a metal liner. The metal liner is formed by the deep drawing and ironing (D.D.I.) process, which is a complex process of deep drawing and ironing. The cylinder part is reinforced by composite layer wrapped through the filament winding process and is bonded to the liner by the curing process. In this study, an integrated design method was presented by establishing the techniques for FE analysis of entire processes (D.D.I., filament winding and curing processes) to manufacture the CNG composite pressure vessel (Type Ⅱ). Dimensions of the dies and the punches of the 1st (cup drawing), 2nd (redrawing-ironing 1-ironing 2) and 3rd (redrawing-ironing) stages were calculated theoretically, and shape of tractrix die to be satisfied with the minimum forming load was suggested for life improvement and manufacturing costs in the D.D.I. process. Thickness of the composite material was determined in the filament winding process, finally, conditions of the curing process (number of heating stage, curing temperature, heating rate and time) were proposed to reinforce adhesive strength between the composite layers.
As energy crisis and environment pollution all around the world threaten the widespread use of fossil fuels, compressed natural gas (CNG) vehicles are explored as an alternative to the conventional gasoline powered vehicles. Because of the limited space available for the car, the composite pressure vessel (Type Ⅱ) has been applied to the CNG vehicles to reach large capacity and weight lightening vehicles. High pressure vessel (Type Ⅱ) is composed of a composite layer and a metal liner. The metal liner is formed by the deep drawing and ironing (D.D.I.) process, which is a complex process of deep drawing and ironing. The cylinder part is reinforced by composite layer wrapped through the filament winding process and is bonded to the liner by the curing process. In this study, an integrated design method was presented by establishing the techniques for FE analysis of entire processes (D.D.I., filament winding and curing processes) to manufacture the CNG composite pressure vessel (Type Ⅱ). Dimensions of the dies and the punches of the 1st (cup drawing), 2nd (redrawing-ironing 1-ironing 2) and 3rd (redrawing-ironing) stages were calculated theoretically, and shape of tractrix die to be satisfied with the minimum forming load was suggested for life improvement and manufacturing costs in the D.D.I. process. Thickness of the composite material was determined in the filament winding process, finally, conditions of the curing process (number of heating stage, curing temperature, heating rate and time) were proposed to reinforce adhesive strength between the composite layers.
[1] P Gąsior, M Malesa, J Kaleta, et al. Application of complementary optical methods for strain investigation in composite high pressure vessel. Composite Structures, 2018, 203(1):718-724.
[2] I Karen, N Kaya, ÖZTÜRK, et al. Intelligent die design optimization using enhanced differential evolution and response surface methodology. Journal of Intelligent Manufacturing, 2015, 26(5):1027-1038.
[3] R Narayanasamy, C Loganathan. Study on wrinkling limit of commercially pure aluminum sheet metals of different grades when drawn through conical and tractrix dies. Materials Science and Engineering:A, 2006, 419(1-2):249-261.
[4] P Geng, J Z Xing, X X Chen. Winding angle optimization of filament-wound cylindrical vessel under internal pressure. Archive of Applied Mechanics, 2017, 87(3):365-384.
[5] L Zu, H Xu, H Wang. Design and analysis of filament-wound composite pressure vessels based on non-geodesic winding. Composite Structures, 2019, 207(1):41-52.
[6] S Minakuchi, S Niwa, K Takagaki, et al. Composite cure simulation scheme fully integrating internal strain measurement. Composites Part A:Applied Science and Manufacturing, 2016, 84:53-63.
[7] N Li, Y Li, J Jelonnek, et al. A new process control method for microwave curing of carbon fibre reinforced composites in aerospace applications. Composites Part B:Engineering, 2017, 122:61-70.
[8] J H Bae, H W Lee, C Kim. A study on integrated design for manufacturing processes of a compressed natural gas composite vessel. International Journal of Precision Engineering and Manufacturing, 2014, 15(7):1311-1321.
[9] S T Atul, M L Babu. A review on effect of thinning, wrinkling and spring-back on deep drawing process. Proceedings of the Institution of Mechanical Engineers, Part B:Journal of Engineering Manufacture, 2019, 233(4):1011-1036.
[10] J P G Magrinho, C M A, Silva, M B Silva, et al. Formability limits by wrinkling in sheet metal forming. Proceedings of the Institution of Mechanical Engineers, Part L:Journal of Materials:Design and Applications, 2018, 232(8):681-692.
[11] J H Bae, H W Lee, M S Kim, et al. Optimal process planning of CNG pressure vessel by ensuring reliability and improving die life. Transactions of the Korean Society of Mechanical Engineers A, 2013, 37(7):865-873.
[12] M Xia, H Takayanagi, K Kemmochi. Analysis of multi-layered filament-wound composite pipes under internal pressure. Composite Structures, 2001, 53(4):483-491.
[13] T R Tauchert. Optimum design of a reinforced cylindrical pressure vessel. Journal of Composite Materials, 1981, 15(5):390-402.
[14] S Nakouzi, F Berthet, Y Maoult, et al. Simulations of an infrared composite curing process. Advanced Engineering Materials, 2011, 13(7):604-608.
[15] T A Bogetti, J W G Jr. Two-dimensional cure simulation of thick thermosetting composites. Journal of Composite Materials, 1991, 25(3):239-273.
[16] R Hardis, J L Jessop, F E Peters, et al. Cure kinetics characterization and monitoring of an epoxy resin using DSC, Raman spectroscopy, and DEA. Composites Part A:Applied Science and Manufacturing, 2013, 49:100-108.
[17] M Rudolph, C Naumann, M Stockmann. Degree of cure definition for an epoxy resin based on thermal diffusivity measurements. Materials Today:Proceedings, 2016, 3(4):1144-1149.
[18] S Yi, H H Hilton, M F Ahmad. A finite element approach for cure simulation thermosetting matrix composite. Computers and Structures, 1997, 64(1-4):383-388.
[19] R Hardis. Cure kinetics characterization and monitoring of an epoxy resin for thick composite structures. Iowa States:Iowa State University, 2012.
[20] K O Lee, H D Sim, H S Kwak, et al. Optimal design of the tractrix die used in the DDI process for manufacturing CG pressure vessels. The Korean Society of Mechanical Engineers, 2016, 40(10):879-886.
[21] Angasu Gonfa, K Srinivasulu. Deep drawing process parameters:A review. International Journal of Current Engineering and Technology, 2016, 6(4):1204-1215.
[22] A R Joshi, K D Kothari, L Jhala. Effects of different parameters on deep drawing process:Review. International Journal of Engineering Research & Technology (IJERT), 2013, 2(3):1-5.
[23] R K Kesharwani, S Basak, S K Panda, et al. Improvement in limiting drawing ratio of aluminum tailored friction stir welded blanks using modified conical tractrix die. Journal of Manufacturing Processes, 2017, 28(1):137-155.
[24] R Pernis, I Barényi, J Kasala, et al. Evaluation of limiting drawing ratio (LDR) in deep drawing process. Acta Metallurgica Slovaca, 2015, 21(4):258-268.
[25] M P Henriques, R J Alves de Sousa, R A F Valente. Numerical simulation of wrinkling deformation in sheet metal forming. 7th EUROMECH Solid Mechanics Conference, Lisbon, Portugal, 2009:7-11.
[26] Z H Hu, R G Wang, X D He, et al. Numerical simulation of residual strain/stress for composite laminate during overall curing process. Journal of Aeronautical Material, 2008, 2:001.
[27] C Li, Liu, M H Liu, Z Y Liu, et al. DSC and curing kinetics of epoxy resin using cyclohexanediol diglycidyl ether as active diluents. Journal of Thermal Analysis and Calorimetry, 2014, 116(1):411-416.
[28] R L Pagano, V M A Calado, F W Tavares, et al. Parameter estimation of kinetic cure using DSC non-isothermal data. Journal of Thermal Analysis and Calorimetry, 2011, 103(2):495-499.
[29] M Sudheer, K R Pradyoth, S Somayaji. Analytical and Numerical validation of epoxy/glass structural composites for elastic models. American Journal of Materials Science, 2015, 5(3C):162-168.
[30] M Hojjati, S V Hoa, Curing simulation of thick thermosetting composites. Composites Manufacturing, 1994, 5(3):159-169.
[31] J Zhang, Y C Xu, P Huang. Effect of cure cycle on curing process and hardness for epoxy resin. Express Polymer Letters, 2009, 3(9):534-541.
