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기하적 필수 전위에 의한 길이효과를 고려한 입자 강화 복합재의 강도해석
서영성(Y. S. Suh),Shailendra P. Joshi,K. T. Ramesh 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
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 predicated 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.
길이 스케일을 고려한 입자강화 복합재의 연속체 강도해석
서영성(Yeong Sung Suh),Shailendra P. Joshi,K. T. Ramesh 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
A continuum based microstructural modeling of particle-reinforced composites including length-scale is presented. The proposed method features finite-element representation of the particles in a matrix along with their size dependent strengthening due to geometrically necessary dislocations (GND), which is punched to the matrix by the plastic relaxation of residual stresses caused by coefficients of thermal expansion mismatch between the particle and the matrix. 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. It was also observed from the effective plastic strain contours that the failure may occur in four different patterns inside and outside the GND boundaries. The proposed method may be easily utilized for the strength design of particle-reinforced composites.