A Unified Guide to Two Opposite Size Effects in Nano Elastic Materials
TANG Yi-Zhe1,2, ZHENG Zhi-Jun1, XIA Meng-Fen1,3, BAI Yi-Long1
1State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 1001902Graduate University of Chinese Academy of Sciences, Beijing 1000493Department of Physics, Peking University, Beijing 100871
A Unified Guide to Two Opposite Size Effects in Nano Elastic Materials
TANG Yi-Zhe1,2, ZHENG Zhi-Jun1, XIA Meng-Fen1,3, BAI Yi-Long1
1State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 1001902Graduate University of Chinese Academy of Sciences, Beijing 1000493Department of Physics, Peking University, Beijing 100871
摘要The microstructural variation near surface of nano elastic materials is analyzed based on different potentials. The atomic/molecular mechanism underlying the variation and its effect on elastic modulus are such that the nature of long-range interactions (attractive or repulsive) in the atomic/molecular potentials essentially governs the variation near surface (looser or tighter) and results in two opposite size effects (decreasing or increasing modulus) with decreasing size.
Abstract：The microstructural variation near surface of nano elastic materials is analyzed based on different potentials. The atomic/molecular mechanism underlying the variation and its effect on elastic modulus are such that the nature of long-range interactions (attractive or repulsive) in the atomic/molecular potentials essentially governs the variation near surface (looser or tighter) and results in two opposite size effects (decreasing or increasing modulus) with decreasing size.
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2009, Vol. 26 
