Studies on Cold Workability Limits of Brass Using Machine Vision System and its Finite Element Analysis


Cold Workability limits of Brass were studied as a function of friction, aspect ratio and specimen geometry. Five standard shapes of the axis symmetric specimens of cylindrical with aspect ratios 1.0 and 1.5, ring, tapered and flanged were selected for the present investigation. Specimens were deformed in compression between two flat platens to predict the metal flow at room temperature. The longitudinal and oblique cracks were obtained as the two major modes of surface fractures. Cylindrical and ring specimen shows the oblique surface crack while the tapered and flanged shows the longitudinal crack. Machine Vision system using PC based video recording with a CCD camera was used to analyze the deformation of 4 X 4 mm square grid marked at mid plane of the specimen. The strain paths obtained from different specimens exhibited nonlinearity from the beginning to the end of the strain path. The circumferential stress component Os increasingly becomes tensile with continued deformation. On the other hand the axial stress Oz , increased in the very initial stages of deformation but started becoming less compressive immediately as barreling develops. The nature of hydrostatic stress on the rim of the flanged specimen was found to be tensile. Finite element software ANSYS has been applied for the analysis of the upset forming process. When the stress values obtained from finite element analysis were compared to the measurements of grids using Machine Vision system it was found that they were in close proximity.

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J. Rao, J. Rao, S. Kamaluddin and N. Bhargava, "Studies on Cold Workability Limits of Brass Using Machine Vision System and its Finite Element Analysis," Journal of Minerals and Materials Characterization and Engineering, Vol. 10 No. 9, 2011, pp. 777-803. doi: 10.4236/jmmce.2011.109061.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Jolgaf, M., Hamouda, A.M.S., Sulaiman, S., Hamdan, M.M, 2003, Development of a CAD/CAM system for the closed–die forging process, J of Material Processing Technology, 138: 436-442.
[2] Rajiv Shivpuri, 2004, Advances in Numerical Modeling of Manufacturing process, Application to steel, Aerospace and Automotive Industries. Trans. Indian. Inst. Metals, 57: 345-366
[3] Taylan Altan., Hannan, D A N, 2002, Forging: Prediction and Elimination of Defects in cold forging using process simulation, The Engineering Research Center for Met shape manufacturing. 2002.
[4] Victor Vazquez., Taylan Altan., 2000, New Concepts in die design–physical and Computer Modeling applications. J of Materials Processing Technology, 98: 212 – 223.
[6] Kunogi, 1954, Reports of the scientific Research Institute, Tokyo.30: 63.
[7] Male, A. T., and Cockcroft, M.G, 1964-65, A Method for the Determination of the Coefficient of Friction of Metals under Conditions of Bulk Plastic Deformation. J. Inst. Of Metals. 93: 38.
[8] Altan T Male, and Vincent Depierre, 1970, Transactions of the ASME J of Lubrication Technology, July 1970: 389 – 397.
[9] Samantha S.K, 1975, Effect of friction and specimen geometry on the ductile fracture in upset. Institute of Engineering Materials and Technology. Transactions of ASME, Jan 1975: 14-20.
[10] Santos, Duarte, D. J.F., Anareis, Rur Neto, Ricardo Paiva, Rocha, A.D, 2001, The use of finite element simulation for optimization of Metal forming and tool design. J of Material Processing Technology. 119: 152 -157.
[11] Kobayashi, S., Oh, S.I. and Altan T, 1989, Metal forming and Finite Element Method, Oxford University Press, New York.
[12] Lee, C.H., and Kobyashi, S, 1973, New solutions to rigid plastic deformation problems using a matrix method. J of Engineering for Industry Trans. of ASME. 95: 865.
[13] Jackson, J.E, J.r., and Ramesh, MS, 1992, The rigid plastic finite element method for simulation of deformation processing, Numerical Modeling of Material deformation Processes. Springer-Verlag, London, pp 48 – 177.
[14] Bathe K.J, 1996, Finite Element Procedures- Prentice – Hall, pp 622.
[15] ASM Hand Book, 1996, Forming and Forging, ASM International.
[16] George E. Dieter, 1928, Mechanical Metallurgy- McGraw-Hill Book Company, London
[17] Gouveia, B.P.P.A, Rodrigues, J.M.C. and Martins, P.A.F, 1996, Fracture Predicting In Bulk Metal Forming. Int. J. Mech. Sci.38: 361-372
[18] Ungair, T., Gubicza, J.,Ribairik, G. and Borbeily, A., 2001, J. of Applied Crystallography. 34: 298
[19] Iwahashi, Y., Horita, Z., Nemota, M. and Langdon, T.G., 1998, Metall Mater Trans A 29: 2503
[20] Komlira. S,.Horita, Z., M. Nemoto and T.G.Longdon., 1999, J. of. Mater. Res. 14: 4044
[21] Erik Parteder and Rolf Bunten., 1998, Determination of flow curves by means of a compressive test under sticking friction conditions using on iterative finite-element procedure, J. of materials processing Technology. 74:227-233
[22] Hollomon, J. H., 1945, Transactions, AIME. 162: 268
[23] Wei Tong., 1998, Strain Characterization of propagative deformation bands. J of the mechanics and physics of solids. 46 (10):2087 – 2102
[24] Johs A. Bailey., 1969, The plane strain forging of Aluminum and An Aluminum alloy at low strain rates and elevated temperatures. Int J of Mechanical Science. 11: 491 – 507.
[25] Samantha, S.K., 1975, Effect of friction and specimen geometry on the ductile fracture in upset. Institute of Engg Materials and Techn., Transactions of ASME. 14:20
[26] Brownrigg, A., Duncan, J.L. and Embury, J.D., 1979, Free Surface Ductility of Steels in Cold Forging, Internal Report, McMaster University, Hamilton, Ontario, Canada.
[27] Kuhn, H.A., Lee, P.W. and Erturk, T., 1973, A Fracture Criterion for Cold Forming, J of Engg Materials and Techn, Transactions of the ASME: 213 – 218
[28] Erman, E., Kuhn, H.A., and Fitzsimons, G., 1983, Novel test specimens for workability testing, in compression testing of Homogeneous Materials and Composites. ASTM STP, 808: 279
[29] George E Dieter., 1988, Mechanical Metallurgy, McGraw-Hill Book Company-London, pp.45-46
[30] B. Rozzo, P., Deluca, B. and Rendina, R., 1972, A new method for the prediction of formability limits in metal sheets, Sheet Metal Forming and Formability: Proceedings of the 7th biennial Conference of the International Deep Drawing Research group
[31] Wu, W.T., Jinn, J.T. and Fischer, C.E.: Scientific Forming Technologies Corporation, Chapter15. ommerce/FileDisplay.cfm&file=06701G_ch.pdf
[33] Kobayashi S., 1970, Deformation Characteristics and Ductile Fracture of 1040 Steel in Simple Upsetting of Solid Cylinders and Rings, J of Engineering for Industry, Trans ASME, Series B, May 92 (2): 391 -399
[34] Lee, C.H. and Kobayashi, S., 1973, New Solutions to Rigid-Plastic Deformation Problems Using a Matrix Method. Journal Eng. Ind. (Trans. ASME), 95: 865
[35] Zeinkiewiez, O.C., 1984, Flow Formulation for Numerical Solution of Forming Processes in J.F.T. Pittman et al. (Eds), Numerical Analysis of Forming Processes, Wiley. New York, pp.1- 44
[36] Ansys 8.0 Reference Manual.
[37] Syed Kamaluddin, J Babu Rao, MMM Sarcar and NRMR Bhargava, 2007, Studies on Flow Behavior of Aluminum Using Vision System during Cold Upsetting. Met and Mater. Trans. B, 38 B: 681-688.
[38] Kudo, H, and Aoi, K., 1967, Effect of Compression Test Condition Upon Fracturing of a Medium Carbon Steel – Study on Cold – Forgeability Test; Part II, Journal of the Japan Society of Technical Plasticity, 8:17-27
[39] David, W, Manthey, Dr. Daeyong Lee, Rebecca M. Pearce, 2005, The Need for Surface Strain Measurement. Metal Forming Magazine.

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