標題: | Characterizing mechanical properties of particulate nanocomposites using micromechanical approach |
作者: | Tsai, Jia-Lin Tzeng, Shi-Hua 機械工程學系 Department of Mechanical Engineering |
關鍵字: | nanocomposites;MD simulation;micromechanical model;Young's modulus |
公開日期: | 1-十一月-2008 |
摘要: | This research aims to propose a continuous micromechanical model for characterizing the mechanical properties of the nanocomposites containing silica nanoparticles embedded in polyimide matrix. The molecular structures of the nanocomposites were established through molecular dynamic ( MD) simulation, from which the non-bonded gap as well as the non-bonded energy between the nano-sized inclusion and the surrounding matrix were evaluated. It was postulated that the normalized non-bonded energy (non-bonded energy divided by surface area of the inclusion) is correlated with the degree of interfacial interaction. Subsequently, an effective interphase micromechanical model including inclusion, matrix and effective interphase was developed, in which the dimension of the effective interphase was assumed equal to the non-bonded gap and the corresponding elastic stiffness was calculated from the normalized non-bonded energy. Comparison of the results calculated from the micromechanical model and the MD simulation indicates that the effective interphase model is capable of describing Young's modulus of particulate nanocomposites with accuracy. In addition, it was revealed that when the particulate size decreases, the corresponding modulus of the nanocomposites increases. |
URI: | http://dx.doi.org/10.1177/0021998308095503 http://hdl.handle.net/11536/8186 |
ISSN: | 0021-9983 |
DOI: | 10.1177/0021998308095503 |
期刊: | JOURNAL OF COMPOSITE MATERIALS |
Volume: | 42 |
Issue: | 22 |
起始頁: | 2345 |
結束頁: | 2361 |
顯示於類別: | 期刊論文 |