Fundamental Simulation Studies of Mixing at Sliding Interfaces

滑动界面混合的基础模拟研究

• 批准号: 0510163
• 负责人: Michael Falk
• 金额: $ 25万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0510163&HistoricalAwards=false
• 关键词: Fundamental; Simulation; Studies; Mixing; Sliding

NSF 0510163Fundamental Simulation Studies of Mixing at Sliding Interfaces PI - Falk, University of MichiganThe investigator and student supported by this grant employ computer simulation on the atomic scale to model the mixing that occurs at the surface when two materials slide against one another. During sliding the way the material responds to elevated stress is intimately connected to the way in which mixing proceeds. These processes are important to several areas of engineering including the prediction of friction, which results in the inefficient use of energy, and wear, which results in the degradation and failure of machines and devices. A greater understanding of mixing at sliding interfaces is also critical for the development of new solid-state joining processes such as friction welding and friction-stir welding that can potentially obviate the need for environmentally harmful and/or toxic processes currently used to join metals. These joining processes have proved important in providing safe, cost-effective and reliable methods for joining of aluminum alloys. The increased use of these lightweight alloys in automotive applications will be critical for increasing fuel economy standards of vehicles to decrease their environmental impact. New alloys can also be created by using such processes to mix metals in the solid state. A variety of different metallic materials are being simulated including metallic glasses and nano-crystalline metals, and the simulations are being compared with the experimental literature. This research provides new ways of understanding the connection between surface treatment, microstructure and mechanical properties. The aim of this research is to establish the foundation for predictive models of microstructure development and mechanical mixing in metal alloys. In addition the investigator is developing graduate education methodologies that provide expertise in relating simulation to experiment. Computational methods developed as part of this research are being incorporated in the introductory computer programming class the investigator teaches to approximately 200 first-year students and in to outreach efforts. These efforts aim to encourage students to pursue careers in computational science and computer-related disciplines by showing the potential impact of simulation on society.

NSF 0510163滑动界面混合的基本模拟研究P1- Falk，University of Piggan该基金支持的研究人员和学生采用原子尺度的计算机模拟来模拟两种材料相互滑动时表面发生的混合。 在滑动过程中，材料对高应力的反应方式与混合进行的方式密切相关。 这些过程对工程的几个领域都很重要，包括摩擦的预测，这会导致能量的低效使用，以及磨损，这会导致机器和设备的退化和故障。 更好地理解滑动界面处的混合对于开发新的固态连接工艺（例如摩擦焊接和摩擦搅拌焊接）也是至关重要的，所述新的固态连接工艺可以潜在地消除目前用于连接金属的对环境有害和/或有毒的工艺的需要。 这些连接工艺在为铝合金的连接提供安全、经济和可靠的方法方面已被证明是重要的。这些轻质合金在汽车应用中的增加使用对于提高车辆的燃料经济性标准以减少其对环境的影响至关重要。 新的合金也可以通过使用这样的过程来混合固态金属来产生。 各种不同的金属材料正在模拟，包括金属玻璃和纳米晶体金属，并与实验文献的模拟进行比较。 这项研究为理解表面处理、显微组织和力学性能之间的联系提供了新的途径。 本研究的目的是建立金属合金微观组织发展和机械混合的预测模型的基础。此外，研究人员正在开发研究生教育方法，提供有关模拟实验的专业知识。 作为这项研究的一部分开发的计算方法正在被纳入调查员教授给大约200名一年级学生的计算机编程入门课程和推广工作。 这些努力旨在通过展示模拟对社会的潜在影响，鼓励学生从事计算科学和计算机相关学科的职业。