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Title: Non-linear deformation behavior during unloading in various metal sheets
Authors: Hama, Takayuki  kyouindb  KAKEN_id
Matsudai, Ryogo
Kuchinomachi, Yota
Fujimoto, Hitoshi  kyouindb  KAKEN_id  orcid (unconfirmed)
Takuda, Hirohiko  kyouindb  KAKEN_id
Author's alias: 濵, 孝之
藤本, 仁
宅田, 裕彦
Keywords: unloading
mild steel sheet
aluminum alloy sheet
magnesium alloy sheet
young’s modulus
instantaneous gradient
crystal plasticity analysis
Issue Date: 2015
Publisher: Iron and Steel Institute of Japan (ISIJ)
Journal title: ISIJ International
Volume: 55
Start page: 1067
End page: 1075
Abstract: The deformation behavior during unloading was examined under uniaxial tension in a mild steel sheet (body-centered cubic metal), an aluminum alloy sheet (face-centered cubic metal), and a magnesium alloy sheet (hexagonal close packed metal). A crystal plasticity finite-element method was also used to investigate the difference in the deformation behavior among on the materials. The nonlinearity during unloading was the largest in the magnesium alloy sheet, and the mild steel sheet showed a larger nonlinearity than the aluminum alloy sheet. On the other hand, the apparent elastic moduli determined from the linear approximation of unloading curves were not always consistent with the characteristics observed in the nonlinearity, and this inconsistency became pronounced as the degree of nonlinearity increased. It was found that the degree of nonlinearity would have a strong correlation with the strain rate sensitivity, suggesting that the apparent elastic modulus was not suitable to model the unloading behavior for materials with high strain rate sensitivity. The crystal plasticity analysis demonstrated that the nonlinearity was much larger in the magnesium alloy sheet than in the other two sheets as observed in the experimental results. The simulation results suggested that one of the reasons that gave rise to the nonlinearity during unloading would be the difference in the critical resolved shear stresses among the slip systems.
Rights: © 2015 ISIJ.
Publisher permitted posting this paper on this repository..
DOI(Published Version): 10.2355/isijinternational.55.1067
Appears in Collections:Journal Articles

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