한국소성가공학회:학술대회논문집 (Proceedings of the Korean Society for Technology of Plasticity Conference)
- 한국소성가공학회 2009년도 춘계학술대회 논문집
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- Pages.322-325
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- 2009
기하적 필수 전위에 의한 길이효과를 고려한 입자 강화 복합재의 강도해석
Strength Analysis of Particle-Reinforced Composites with Length-Scale Effect based on Geometrically Necessary Dislocations
- 서영성 (한남대학교 기계공학과) ;
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- Suh, Y.S. ;
- Joshi, Shailendra P. (National University of Singapore, Department of Mechanical Engineering) ;
- Ramesh, K.T. (Johns Hopkins University, Department of Mechanical Engineering)
- 발행 : 2009.05.07
초록
An enhanced continuum model for the size dependent strengthening of particle reinforced composites is presented. The model accounts explicitly for the enhanced strength in a discretely defined "punched zone" around the particle in a metal matrix composite as a result of geometrically necessary dislocations developed through a CTE mismatch. The size of the punched zone presents an intrinsic length scale, and this results in the size dependence of the overall behavior of the composite. Results show that predicted 0.2% offset yield stresses are increasing with smaller inclusions and larger volume fractions and this length-scale effect on the enhanced strength can be observed by explicitly including GND region around the particle.
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