Generation of Cyclic Stress-Strain Curves for Sheet Metals
Affiliation:
1. The Ohio State University, 206 West 18th Avenue, Columbus, OH 43210
Abstract
The main objective of this paper is to obtain the first few stress-strain loops of sheet metals from reverse loading so that the springback can be simulated accurately. Material parameters are identified by an inverse method within a selected constitutive model that represents the hardening behavior of materials subjected to a cyclic loading. Three-point bending tests are conducted on sheet steels (mild steel and high strength steel). Punch stroke, punch load, bending strain, and bending angle are measured directly during the tests. Bending moments are then computed from these measured data. Bending moments are also calculated based on a constitutive model. Normal anisotropy and nonlinear isotropic/kinematic hardening are considered. Material parameters are identified by minimizing the normalized error between two bending moments. Micro-genetic algorithm is used in the optimization procedure. Stress-strain curves are generated with the material parameters found in this way, which can be used with other plastic models.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference30 articles.
1. Wang, N. M., and Budiansky, B., 1978, “Analysis of Sheet Metal Stamping by a Finite Element Method,” ASME J. Appl. Mech., 45, No. 1, pp. 73–81. 2. Kobayashi, S., and Kim, J. H., 1978, “Deformation Analysis of Axisymmetric Sheet Metal Forming Processes by the Rigid-Plastic Finite Element Method,” Mechanics of Sheet Metal Forming, Eds., Koistinen, D. P., and Wang, N. M., Plenum Press, New York, pp. 178–190. 3. Key, S. W., Krieg, R. D., and Bathe, K. J., 1979, “On the Application of Finite Element Method to Metal Forming Processes,” Comput. Methods Appl. Mech. Eng., 17, No. 18, pp. 579–608. 4. Yoshida, F., Hino, R., and Okada, T., 1990, “Deformation and Fracture of Stainless Steel/Aluminum Sheet Laminates in Stretch Bending,” Proceedings of the 5th International Symposium on Plasticity and its Current Applications, Elsevier, Amsterdam, pp. 869–872. 5. Zhang, Z. T., and Hu, S. J., 1998, “Stress and Residual Stress Distributions in Plane Strain Bending,” Int. J. Mech. Sci., 40, No. 6, pp. 533–543.
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