报告人： Prof. Zhen Chen,
University of Missouri-Columbia, Columbia, USA
Recent Efforts in Model-Based Simulation of Combined Rate, Size and Thermal Effects on Single Crystal Strength and Bio-Nano Interactions
Understanding materials responses at different sizes under various temperatures and loading rates is essential to evaluating the integrity and safety of MEMS/NEMS devices under extreme loading conditions. Although material properties are rate-, size- and temperature-dependent in nature, little has been done in investigating combined rate, size and temperature effects on the material properties. Based on the experimental and computational capabilities available, hence, efforts have been made recently to formulate a hyper-surface in spatial, temporal and thermal domains to model combined rate, size and thermal effects on single crystal strength. It appears from the preliminary results that the proposed procedure might provide an effective means to bridge different spatial and temporal scales in a unified multiscale modeling framework at different temperatures. To further improve the proposed procedure, the effects of loading path and crystal orientation on the hyper-surface are being investigated, which will be presented in the seminar. To demonstrate the potential impact of nano materials on the environment, recent investigations on bio-nano interactions will also be discussed.
报告时间： 2006年12月4日(周一) 上午10:00--11:00