CAREER: Dynamic Contact Modeling and Experiments on Miniature Systems

职业：微型系统的动态接触建模和实验

• 批准号: 0239232
• 负责人: Andreas Polycarpou
• 金额: $ 41.46万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-05-01 至 2009-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0239232&HistoricalAwards=false
• 关键词: CAREER; Dynamic; Contact; Modeling; Experiments

The performance and durability of microdevices in sliding contact is strongly dependent on interfacial phenomena like adhesion, friction, wear, and friction/vibration interaction. It is becoming increasingly recognized that problems of stiction, adhesion and other critical phenomena such as bouncing vibrations occur dynamically in the presence of time-varying loads and motions. As high-speed contacts operate under ever more challenging conditions, contact or sticking can, in principle, occur at any time.Intellectual Merit: In this research, a systematic approach to dynamic contact studies of microsystems will be performed based on system independent interfacial models that are coupled to the system dependent dynamics of the interface. A unique feature of the proposed approach is the direct incorporation of the intermolecular (adhesion) forces and kinetic friction models based on continuum mechanics into a dynamically moving contact interface. This will enable contact length scales from micrometer to millimeter range and beyond to be covered. Also, two unique microtribometers will be built to measure key dynamic properties of realistic miniature systems, and to conduct dynamic contact and friction experiments for model verification and for studying such phenomena in HDI's, and MEMS. The outcome of this research is to: (a) Develop a rigorous kinetic friction model for microdevices; (b) Use the model to predict interfacial forces, damping and kinetic friction, thus providing a powerful tool for controlling adhesion, friction and wear in microsystems; (c) Predict the motions of contacting and pseudo-contacting HDI's and MEMS as a function of design parameters like roughness, material properties, and system dynamic properties, thus avoiding large vibrations and impact forces and the associated catastrophic consequences.Broader Impacts: The research plan will advance the knowledge of tribology and microtribolgy, while the education plan of this research will disseminate it outside the research group and beyond the University. The educational goals of increasing the awareness of micro/nanotribology and engineering in general, will be accomplished by: (a) establishing an outreach K-12 program targeting students grades 1 through 5 (cub-scouts) and high school students, (b) enhancing a basic tribology course using modern teaching techniques and also recruiting underrepresented students to work on projects and disseminate the information to the public, (c) developing a new graduate class in friction/vibration for miniature systems (microtribodynamics) that will include current research findings, and (d) actively participating in local and professional societies to promote engineering and tribology.The proposed integrated research and education plan will advance further the development of micromachines, which has a major potential impact on society through transformation of a wide range of technologies, and at the same time increase the awareness and significance of friction and tribology

滑动接触微型器件的性能和耐用性很大程度上取决于界面现象，如粘附、摩擦、磨损和摩擦/振动相互作用。 人们越来越认识到，在存在时变负载和运动的情况下，会动态地发生静摩擦、粘附和其他关键现象（例如弹跳振动）的问题。 由于高速接触在越来越具有挑战性的条件下运行，原则上，接触或粘附可能随时发生。 智力优点：在这项研究中，将基于与系统相关的界面动力学耦合的系统独立界面模型来执行微系统动态接触研究的系统方法。 该方法的独特之处在于将基于连续介质力学的分子间（粘附）力和动摩擦模型直接纳入动态移动的接触界面中。 这将能够覆盖从微米到毫米甚至更远的接触长度范围。 此外，还将建造两个独特的微摩擦计来测量现实微型系统的关键动态特性，并进行动态接触和摩擦实验以进行模型验证以及研究 HDI 和 MEMS 中的此类现象。 这项研究的成果是： (a) 为微型设备开发严格的动摩擦模型； (b) 使用该模型预测界面力、阻尼和动摩擦，从而为控制微系统中的粘附、摩擦和磨损提供有力的工具； (c) 预测接触和伪接触 HDI 和 MEMS 的运动作为粗糙度、材料特性和系统动态特性等设计参数的函数，从而避免大振动和冲击力以及相关的灾难性后果。更广泛的影响：该研究计划将推进摩擦学和微摩擦学的知识，而本研究的教育计划将在研究小组和大学之外传播它。 提高对微/纳米摩擦学和工程学认识的教育目标将通过以下方式实现：(a) 建立针对 1 至 5 年级学生（童子军）和高中生的 K-12 外展计划，(b) 利用现代教学技术加强基础摩擦学课程，并招募代表性不足的学生参与项目并向公众传播信息，(c) 在 微型系统的摩擦/振动（微摩擦动力学），其中将包括当前的研究成果，以及（d）积极参与当地和专业协会，以促进工程和摩擦学的发展。拟议的综合研究和教育计划将进一步推动微型机械的发展，通过广泛的技术变革对社会产生重大的潜在影响，同时提高对摩擦和摩擦学的认识和重要性