Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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Approximate Yield Criterion for Voided Anisotropic Ductile Materials

  • Kim, Youngsuk (School of Mechanical Engineering, Kyungpook National University) ;
  • Sungyeun Won (Graduate School Kyungpook National University) ;
  • Kim, Dogsoo (Graduate School Kyungpook National University) ;
  • Hyunsung Son (Graduate School Kyungpook National University)
  • Published : 2001.10.01
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Abstract

As most fractures of ductile materials in metal forming processes occurred due to the results of evolution of internal damage - void nucleation, growth and coalescence. In this paper, an approximate yield criterion for voided (porous) anisotropic ductile materials is developed. The proposed approximate yield function is based on Gurson's yield function in conjunction with the Hosford's non-quadratic anisotropic yield criterion in order to consider the characteristic of anisotropic properties of matrix material. The associated flow rules are presented and the laws governing void growth with strain are derided. Using the proposed model void growth of an anisotropic sheet under biaxial tensile loading and its effect on sheet metal formability are investigated. The yield surface of voided anisotropic sheet and void growth with strain are predicted and compared with the experimental results.

Keywords

References

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