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.
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October 2001
Technical Papers
Generation of Cyclic Stress-Strain Curves for Sheet Metals
K. M. Zhao,
K. M. Zhao
The Ohio State University, 206 West 18th Avenue, Columbus, OH 43210
11
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J. K. Lee
J. K. Lee
The Ohio State University, 206 West 18th Avenue, Columbus, OH 43210
Search for other works by this author on:
K. M. Zhao
11
The Ohio State University, 206 West 18th Avenue, Columbus, OH 43210
J. K. Lee
The Ohio State University, 206 West 18th Avenue, Columbus, OH 43210
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division July 24, 2000. Guests Editors: Jian Cao and Z. Cedric Xia
J. Eng. Mater. Technol. Oct 2001, 123(4): 391-397 (7 pages)
Published Online: July 24, 2000
Article history
Received:
July 24, 2000
Citation
Zhao, K. M., and Lee, J. K. (July 24, 2000). "Generation of Cyclic Stress-Strain Curves for Sheet Metals ." ASME. J. Eng. Mater. Technol. October 2001; 123(4): 391–397. https://doi.org/10.1115/1.1395021
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