In this paper, a constitutive equation for superplasticity, which is based on the microstructural mechanism of superplastic deformation taking into account the effects of deformation damage, is incorporated into the finite element method to simulate the superplastic forming process. The effects of strain rate sensitivity, cavity growth and imposed hydrostatic pressure on the strain limit are studied. The predicted results are validated through the comparison with the existing experimental data. It is found that the present model produces accurate results in all cases.
Issue Section:
Technical Papers
1.
Bonet, J., and Wood, R. D., 1987, “Solution Procedures for the Finite Element Analysis of Superplastic Forming of Thin Sheet,” Int. Conf. Comp. Plast. Modals, Software and Applications, Swansea, pp. 917–926.
2.
Bellet, M., Massoni, E., and Chenot, J. L., 1987, “A Viscoplastic Membrane Formulation for 3D Analysis of Superplastic Forming of Thin Sheet,” Int. Conf. Comp. Plast. Modals, Software and Applications, Swansea, pp. 917–926.
3.
Li
, G. Y.
, Tan
, M. J.
, and Liew
, K. M.
, 1999
, “Springback Analysis for Sheet Forming Processes By Explicit Finite Element Method in Conjunction with the Orthogonal Regression Analysis
,” Int. J. Solids Struct.
, 36
, pp. 4653
–4668
.4.
Li
, G. Y.
, Tan
, M. J.
, Liew
, K. M.
, and Zhong
, Z. H.
, 2001
, “Sheet Forming Analysis Based on Improved Contact Searching Algorithm and Simple Approach for Contact Force Evaluation
,” ASME J. Eng. Mater. Technol.
, 123
, pp. 119
–124
.5.
Liew
, K. M.
, Ray
, T.
, Tan
, H.
, and Tan
, M. J.
, 2002
, “Evolutionary Optimization and Use of Neural Network for Optimum Stamping Process Design for Minimum Springback
,” ASME J. Comput. Inf. Sci. Eng.
, 2
, pp. 38
–44
.6.
Chandra
, N.
, and Pang
, P.
, 1997
, “Numerical Modeling of Superplastic Deformation Mechanism
,” Mater. Sci. Forum
, 243–245
, pp. 53
–59
.7.
Bampton
, C. C.
, and Raj
, R.
, 1982
, “Influence of Hydrostatic Pressure and Multriaxial Straining on Cavitation in a Superplastic Aluminum Alloy
,” Acta Metall.
, 30
, pp. 2043
–2053
.8.
Bampton
, C. C.
, Mahoney
, M. W.
, Hamilton
, C. H.
, Ghosh
, A. K.
, and Raj
, R.
, 1983
, “Control of Superplastic Cavitation by Hydrostatic Pressure
,” Metall. Trans. A
, 14
, pp. 583
–1591
.9.
Lian
, J.
, and Suery
, M.
, 1986
, “Effect of Strain Rate Sensitivity and Cavity Growth Rate on Failure of Superplastic Material
,” Mater. Sci. Technol.
, 2
, pp. 1093
–1098
.10.
Zhou
, D. J.
, and Lian
, J.
, 1987
, “Numerical Analysis of Superplastic Bulging for Cavitysensitive Materials
,” Int. J. Mech. Sci.
, 29
, pp. 565
–576
.11.
Du
, Z.
, Li
, M.
, Liu
, M.
, and Wu
, S.
, 1996
, “Numerical Computation of Cavity Damage and Failure During the Superplastic Deformation of Sheet Metal
,” J. Mater. Process. Technol.
, 57
, pp. 298
–303
.12.
Kannan
, K.
, and Hamilton
, C. H.
, 1995
, “Cavity Distribution Effects on Superplastic Ductility of A Eutectic Pb-Sn Alloy
,” Scr. Mater.
, 37
, pp. 455
–462
.13.
Chan
, K. C.
, and Tong
, G. O.
, 1998
, “The Cavitation Behavior of A High-Strain-Rate Superplastic AL6061/20SiCw Composite Under Uniaxial and Equibiaxial Tension
,” Scr. Mater.
, 38
, pp. 1705
–1710
.14.
Iwasaki
, H.
, Mabuchi
, M.
, Higashi
, K.
, and Langdon
, T. G.
, 1998
, “The Characteristics of Microcavitation in High Strain Rate Superplasticity
,” Mater. Sci. Eng., A
, 246
, pp. 117
–123
.15.
Stowell
, M. J.
, 1983
, “Cavity Growth and Failure in Superplastic Alloys
,” Met. Sci.
, 17
, pp. 92
–98
.16.
Lian
, J.
, and Chen
, J.
, 1991
, “Plastic Instability and Strain to Fracture for Damaged Materials
,” Mater. Sci. Eng., A
, 131
, pp. 9
–15
.17.
Baudelet
, B.
, and Lian
, J.
, 1995
, “A Composite Model for Superplasticity
,” J. Mater. Sci.
, 30
, pp. 1977
–1981
.18.
Lian
, J.
, Valiev
, R. X.
, and Baudelet
, B.
, 1995
, “On the Enhanced Grain Growth in Ultrafine Grained Metals
,” Acta Metall.
, 43
, pp. 4165
–4178
.19.
Chung
, K.
, and Wagoner
, R. H.
, 1987
, “Numerical Improvement of Viscoplastic, Nonlinear, Finite-Element Analysis
,” Int. J. Mech. Sci.
, 29
, pp. 45
–59
.20.
Song
, Y.
, and Zhao
, J.
, 1986
, “A Mechanical Analysis of the Superplastic Free Bulging of Metal Sheet
,” Mater. Sci. Eng.
, 84
, pp. 111
–123
.21.
Lian
, J.
, and Baudelet
, B.
, 1986
, “Necking Development and Strain to Fracture Under Uniaxial Tension
,” Mater. Sci. Eng.
, 84
, pp. 157
–162
.22.
Ghosh
, A. K.
, and Hamilton
, C. H.
, 1982
, “Influence of Material Parameters and Microstructure on Superplastic Forming
,” Metall. Trans. A
, 13
, pp. 733
–742
.Copyright © 2003
by ASME
You do not currently have access to this content.
