Micromechanical Deformation

微机械变形

• 批准号: 9221326
• 负责人: James Li
• 金额: $ 36.22万
• 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: 1993
• 资助国家: 美国
• 起止时间: 1993-03-15 至 1996-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9221326&HistoricalAwards=false
• 关键词: Micromechanical; Deformation

This grant investigates micromechanical deformation using atomic force microscopy, continuous indentation testing, and impression creep analysis. These techniques are applied to several materials systems (bucky balls, amorphous metals, polymers) to develop new tools for micromechanical testing applicable to thin films. Nanoindentation experiments are planned using the atomic force microscope and its associated small indenter. Shear bands are examined in polymers and amorphous metals. Theoretical support includes consideration of the molecular dynamics of the interaction between bucky balls, finite element analysis of continuous loading and unloading with an indenter, and diffusional creep at aluminum grain boundaries. %%% The results impact the area of micromechanical measurement of thin films and small particles. Crack nucleation, erosion, and localized deformation are examples of microdeformation phenomena that would benefit from improved analysis techniques.

这笔赠款使用原子力显微镜、连续压痕测试和压痕蠕变分析来研究微观机械变形。这些技术被应用于几种材料系统(巴基球、非晶态金属、聚合物)，以开发适用于薄膜的微机械测试的新工具。计划使用原子力显微镜及其相关的小压头进行纳米压痕实验。在聚合物和非晶态金属中观察到剪切带。理论支持包括考虑Bucky球之间相互作用的分子动力学，压头连续加载和卸载的有限元分析，以及铝晶界的扩散蠕变。%这一结果影响了薄膜和小颗粒的微机械测量面积。裂纹形核、侵蚀和局部变形是微变形现象的例子，这些现象将受益于改进的分析技术。