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http://dx.doi.org/10.3795/KSME-A.2011.35.3.273

Numerical Assessment of Dislocation-Punching Theories for Continuum Structural Analysis of Particle-Reinforced Metal Matrix Composites  

Suh, Yeong-Sung (Dept. of Mechanical Engineering, Hannam Univ.)
Kim, Yong-Bae (Dept. of Mechanical Engineering, Hannam Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.35, no.3, 2011 , pp. 273-279 More about this Journal
Abstract
The yield strength of particle-reinforced composites increases as the size of the particle decreases. This kind of length scale has been mainly attributed to the geometrically necessary dislocation punched around the particle as a result of the mismatch of the thermal expansion coefficients of the particle and the matrix when the composites are cooled down after consolidation. In this study, two dislocation-punching theories that can be used in continuum structural modeling are assessed numerically. The two theories, presented by Shibata et al. and Dunand and Mortensen, calculate the size of the dislocationpunched zone. The composite yield strengths predicted by finite element analysis were qualitatively compared with experimental results. When the size of the particle is less than $2{\mu}m$, the patterns of the composite strength are quite different. The results obtained by Shibata et al. are in qualitatively better agreement with the experimental results.
Keywords
Particle-Reinforced Metal Matrix Composites; Dislocation Punching; Geometrically Necessary Dislocation; Length Scale; Finite-Element Analysis; Numerical Assessment;
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Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By SCOPUS : 0
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