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Modeling of Size-Dependent Strengthening in Particle-Reinforced Aluminum Composites with Strain Gradient Plasticity

변형률 구배 소성을 고려한 입자 강화 알루미늄 복합재의 크기 종속 강화 모델링

  • 서영성 (한남대학교 기계공학과) ;
  • 박문식 (한남대학교 기계공학과) ;
  • 송승 (한남대학교 기계공학과)
  • Received : 2010.12.13
  • Accepted : 2011.03.14
  • Published : 2011.07.01

Abstract

This study proposes finite element modeling of dislocation punching at cooling after consolidation in order to calculate the strength of particle-reinforced aluminum composites. The Taylor dislocation model combined with strain gradient plasticity around the reinforced particle is adopted to take into account the size-dependency of different volume fractions of the particle. The strain gradients were obtained from the equivalent plastic strain calculated during the cooling of the spherical unit cell, when the dislocation punching due to CTE (Coefficient of Thermal Expansion) mismatch is activated. The enhanced yield stress was observed by including the strain gradients, in an average sense, over the punched zone. The tensile strength of the SiCp/Al 356-T6 composite was predicted through the finite element analysis of an axisymmetric unit cell for various sizes and volume fractions of the particle. The predicted strengths were found to be in good agreement with the experimental data. Further, the particle-size dependency was clearly established.

Keywords

Particle-Reinforced Aluminum Composites;Strain Gradient Plasticity;Finite Element Modeling;Dislocation Punching;Particle Size Dependency

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