Finite Element Analysis of Deformation Behavior During ECAP for an Aluminum Alloy Composite Model containing a SiC Particle and Porosities

강화상과 기공이 포함된 금속기지 복합재 모델의 ECAP 거동에 대한 유한요소해석

  • 이성철 (포항공과대학교 대학원) ;
  • 하상렬 (포항공과대학교 대학) ;
  • 김기태 (포항공과대학교 기계공학과) ;
  • 황상무 (포항공과대학교 기계공학) ;
  • 허륜민 (아주대학교 대학원 분자과학기술학) ;
  • 정형식 (아주대학교 분자과학기술학)
  • Published : 2004.06.01


The plastic deformation behavior of an aluminum alloy containing a particle and porosities was investigated at room temperature during equal channel angular pressing (ECAP). Finite element analysis by using ABAQUS shows that ECAP is a useful tool for eliminating residual porosity in the specimen, and more effective under friction condition. The simulation, however, shows considerably low density distributions for matrix near a particle at which many defects may occur during severe deformation. Finite element results of effective strains and deformed shapes for matrix with a particle were compared with theoretical calculations under simple shear stress. Also, based on the distribution of the maximum principal stress in the specimen, Weibull fracture probability was obtained for particle sizes and particle-coating layer materials. The probability was useful to predict the trend of more susceptible failure of a brittle coating layer than a particle without an interphase in metal matrix composites.


Composites;Equal Channel Angular Pressing;Finite Element Analysis;Porous Materials;Weibull Fracture Probability


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