Mechanics vs. Morphogenesis
讲座名称：
Mechanics vs. Morphogenesis
讲座时间：
2010-06-11
讲座人：
陈曦
形式：
校区：
兴庆校区
实践学分：
讲座内容：
应航天航空学院和能动学院邀请，我校知名校友哥伦比亚陈曦教授将访问我校并进行学术交流。欢迎广大感兴趣的教师和学生参加！
报告题目：Mechanics vs. Morphogenesis
报告时间：2010年6月11日（周五）下午16：00—18：00
报告地点：航天航空学院教一楼南208
[报告摘要]
Numerous highly ordered patterns can be achieved by manipulating the self-assembled buckling of thin films on compliant substrates upon mismatched deformation. Most previous studies were limited to planar substrates, and the investigation of a closed film on a curved substrate is rare yet such system is highly relevant to quite a few natural and biological systems. We establish the framework of elastic buckling of a model spheroidal thin film/substrate system, in which the bifurcation is driven by anisotropic (non-equi-biaxial) compressive stresses in the film. A reduced theoretical model is proposed, from which explicit formulae are derived to correlate the undulation characteristics with the geometry and material property of a prolate system. Various ways to manipulate the undulations are discussed. It is shown that some global features of quite a few natural and biological systems, for example the distinctive patterns observed in various fruits, vegetables, nuts, eggs, tissues, animal body parts, etc., can be reproduced by anisotropic stress-driven buckling on spheroidal film/substrate models. The mechanical principles and the potential of mechanical self-assembly are demonstrated for fabricating three-dimensional gear-like microstructures. Thus, the mechanics framework studied herein has important implications on morphogenesis, as well as having potential applications to guide micro-fabrications via controlled self-assembly on curved substrate surfaces.
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