DOI QR코드

DOI QR Code

Constitutive Modeling of AZ31B Magnesium Alloys

AZ31B 마그네슘 합금 판재의 구성식 개발

  • 이명규 (한국기계연구원 재료연구소) ;
  • 정관수 (서울대학교 재료공학부) ;
  • 김헌영 (강원대학교 기계.메카트로닉스 공학부)
  • Published : 2007.07.01

Abstract

Magnesium alloy sheets in room temperature have unusual mechanical properties such as high in-plane anisotropy/asymmetry of yield stress and hardening behavior. In this paper, the continuum plasticity models considering the plastic behavior of AZ31B Mg alloy sheet were derived. A new hardening law based on modified two-surface model was developed to consider the general stress-strain response of metals including Bauschinger effect, transient behavior and the unusual asymmetry. Three deformation modes observed during the continuous tension/compression tests were mathematically formulated with simplified relations between the state of deformation and their histories. To include the anisotropy and asymmetry of the initial yield stress, the Drucker-Prager's pressure dependent yield surface was modified by adding anisotropic constants.

Keywords

References

  1. C. S. Roberts, 1960, Magnesium and its alloys, New York: John Wiley
  2. X. Y. Lou, M. Li, R. K. Boger, S. R. Agnew, R. H. Wagoner, 2007, Hardening Evolution of AZ31B Mg Sheet, Int. J. Plast. Vol. 23, p. 44 https://doi.org/10.1016/j.ijplas.2006.03.005
  3. H. K. Kim, W. R. Lee, S. K. Hong, J. D. Kim, B. K. Han, 2006, Finite-Element Analysis of Warm Square Cup Deep Drawing Process of Magnesium Alloy AZ31 Sheet, Transactions of Materials Processing, Vol.15 No.3, p. 232 https://doi.org/10.5228/KSPP.2006.15.3.232
  4. M. Lee, D. Kim, C. Kim, M. Wenner, R. H. Wagoner, K. Chung, A practical two-surface model and its application to springback prediction, Int. J. Plast. (in press)
  5. J. Kim, M. G. Lee, H. Ryou, K. Chung, J. R. Youn, T. J. Kang, Development of nonlinear constitutive laws for anisotropic and asymmetric fiber reinforced composite Polymer Composites(accepted)
  6. M. G. Lee, R. H. Wagoner, K. Chung, J. K. Lee, H. Y. Kim, Constitutive Modeling for Anisotropic / Asymmetric Hardening Behavior of Magnesium alloy sheets, 2007, Int. J. Plast.,(submirted)