Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Prediction of Necking in Tensile Test using Crystal Plasticity Model and Damage Model

결정소성학 모델과 손상 모델을 이용한 박판소재의 네킹 예측

  • Kim, Jong-Bong (Department of Mechanical and Automotive Engineering, Seoul Nat. Univ. of Sci. Tech.) ;
  • Hong, Seung-Hyun (Sheet Metal Development TFT, Hyundai Motor Company and Kia Motors Corporation) ;
  • Yoon, Jeong-Whan (Department of Engineering & Industrial Sci., Swinburne Univ. of Technol.)
  • 김종봉 (서울과학기술대학교 기계.자동차공학과) ;
  • 홍승현 (현대기아자동차 연구소 박판개발팀) ;
  • 윤정환
  • Received : 2012.06.04
  • Accepted : 2012.06.12
  • Published : 2012.08.01
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Abstract

In order to predict necking behaviour of aluminium sheets, a crystal plasticity model is introduced in the finite element analysis of tensile test. Due to the computational limits of time and memory, only a small part of tensile specimen is subjected to the analysis. Grains having different orientations are subjected to numerical tensile tests and each grain is discretized by many elements. In order to predict the sudden drop of load carrying capacity after necking, a well-known Cockcroft-Latham damage model is introduced. The mismatch of grain orientation causes stress concentration at several points and damage is evolved at these points. This phenomenon is similar to void nucleation. In the same way, void growth and void coalescence behaviours are well predicted in the analysis. For the comparison of prediction capability of necking, same model is subjected to finite element analysis using uniform material properties of polycrystal with and without damage. As a result, it is shown that the crystal plasticity model can be used in prediction of necking and fracture behavior of materials accurately.

Keywords

References

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