Micromechanical Deformation

微机械变形

• 批准号: 9623808
• 负责人: James Li
• 金额: $ 35.89万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-01 至 2000-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9623808&HistoricalAwards=false
• 关键词: Micromechanical; Deformation

9623808 Li The purpose of this project is to examine several techniques that can be employed in studying micromechanical deformation. Included within this group are the atomic force microscope, continuous indentation testing, the impression creep machine, and the scratch tester. Continuous indentation testing experiments are employed as a new technique to determine the adhesion strength between a deposited thin film and the substrate, as well as measuring Young's modulus and PoissonOs ratio of the film itself. Impression creep machine tests of grain boundaries and triple junctions in zinc are analyzed. Scratch testing of glass and polymers is performed to understand the stick/slip process. The atomic force microscope looks at shear bands in amorphous metals (with a magnetic indenter) as well as micro shear bands and crazes in polymers. Continuous indentation testing of amorphous metals on the wheel side and the air side are compared. Theoretical analysis involves finite element computation, analytical methods, molecular dynamics and modeling of critical steps in all of the tests. The studies are aimed at answering questions associated with the employment of these techniques and the micromechanical deformation behavior of the selected materials. %%% The results should impact techniques used for micromechanical measurements, polishing and grinding of glasses, and improved adhesion of thin films and coatings to substrates. ***

9623808 Li 该项目的目的是研究可用于研究微机械变形的几种技术。 该组包括原子力显微镜、连续压痕测试、压痕蠕变机和划痕测试仪。 连续压痕测试实验是一种新技术，用于确定沉积薄膜与基材之间的粘合强度，以及测量薄膜本身的杨氏模量和泊松比。 分析了锌中晶界和三重结的印象蠕变机测试。 对玻璃和聚合物进行划痕测试是为了了解粘/滑过程。 原子力显微镜观察非晶态金属中的剪切带（使用磁性压头）以及聚合物中的微剪切带和裂纹。 对车轮侧和空气侧非晶态金属的连续压痕测试进行了比较。 理论分析涉及有限元计算、分析方法、分子动力学和所有测试中关键步骤的建模。 这些研究旨在回答与这些技术的使用以及所选材料的微机械变形行为相关的问题。 %%% 结果应该会影响用于微机械测量、玻璃抛光和研磨以及改善薄膜和涂层对基材的附着力的技术。 ***