Fibers and Polymers

The Korean Fiber Society (한국섬유공학회)
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Anisotropic-Asymmetric Yield Criterion and Anisotropic Hardening Law for Composite Materials: Theory and Formulations

  • Kim Ji-Hoon (School of Materials Science and Engineering, Seoul National University) ;
  • Lee Myoung-Gyu (Department of Materials Science and Engineering, Ohio State University) ;
  • Chung Kwan-Soo (School of Materials Science and Engineering, Seoul National University) ;
  • Youn Jae-Ryoun (School of Materials Science and Engineering, Seoul National University) ;
  • Kang Tae-Jin (School of Materials Science and Engineering, Seoul National University)
  • Published : 2006.03.01
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Abstract

In this paper, elasto-plastic constitutive equations for highly anisotropic and asymmetric materials are developed and their numerical implementation is presented. Some engineering materials such as fiber reinforced composites show different material behavior in the different material directions (anisotropy) as well as in tension and compression (asymmetry). Although these materials have mostly been analyzed using the anisotropic elastic constitutive equations, the necessity of consideration of plastic properties has been frequently reported in the previous works. In order to include both the anisotropic and asymmetric properties of composite materials, the Drucker-Prager yield criterion is modified by adding anisotropic parameters and initial components of translation. The implementation procedure for the developed theory and algorithms is presented based on the implicit finite element scheme. The measured data from the previous work are used to validate the present constitutive equations.

Keywords

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