Fatigue Response of Nanostructured Metallic Materials

纳米结构金属材料的疲劳响应

• 批准号: 0836575
• 负责人: T. Venkatesh
• 金额: --
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-02-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0836575&HistoricalAwards=false
• 关键词: Fatigue; Response; Nanostructured; Metallic; Materials

Recent research efforts have demonstrated that nanostructured materials exhibit significant enhancements in mechanical properties such as yield strength, hardness and wear resistance, when compared to conventional 'microstructured' materials. However, a comprehensive understanding of the fatigue and fracture behavior of nanostructured materials is currently unavailable. Furthermore, the potential for enhancing the fatigue life of conventional materials through the creation of nanostructured surface layers/coatings has not been explored in sufficient depth. Hence, this project is directed towards obtaining key insights on the fatigue phenomenon in nanostructured materials. Through an approach that combines analytical modeling, numerical modeling, and experiments on model nanostructured metallic systems (nickel and iron), this study lays the foundation for: (i) a fundamental understanding of the plain fatigue and fatigue crack growth response of nanostructured materials; (ii) a quantitative assessment of the contact fatigue response of nanostructured materials; (iii) a unique application of a novel adhesion model for the prediction of contact fatigue crack initiation in nanostructured materials; and (iv) the development of a simplified numerical model for contact fatigue life prediction in nanostructured materials. The present study leads to broad impact at the following three levels: (i) Research: By advancing the current understanding of the mechanisms associated with fatigue of nanostructured materials, the research activities provide scientific and technological impact in the tribology industry (including aircraft, automotive, and bio-medical, fatigue-sensitive applications). Comprehensive research training is imparted to one graduate student. Because Louisiana's research investment has been significantly lower than in other states, the project activities also enhance the state's research base and educational efforts in the field of nanotechnology. (ii) Educational experience for minorities: In conjunction with this research project, a graduate/undergraduate course on Deformation, Fatigue and Fracture that has been developed by the PI, is enhanced to provide an exciting hands-on experimental component to the class-room learning experience about the fatigue phenomenon.

最近的研究工作表明，与常规的“微结构”材料相比，纳米结构材料在机械性能（例如屈服强度，硬度和耐磨性）中表现出显着增强。但是，目前尚无对纳米结构材料的疲劳和断裂行为的全面理解。此外，尚未在足够的深度中探索通过创建纳米结构的表面层/涂层来增强常规材料疲劳寿命的潜力。因此，该项目旨在获得有关纳米结构材料中疲劳现象的关键见解。通过结合模型纳米结构金属系统（镍和铁）的分析建模，数值建模和实验的方法，这项研究为：（i）对纳米结构材料的普通疲劳和疲劳裂纹生长反应的基本了解； （ii）对纳米结构材料的接触疲劳反应的定量评估； （iii）新型粘附模型在纳米结构材料中预测接触疲劳裂纹启动的独特应用； （iv）开发一种简化的数值模型，用于纳米结构材料中的接触疲劳寿命预测。本研究在以下三个层面上导致了广泛的影响：（i）研究：通过促进对与纳米结构材料疲劳相关机制的当前理解，研究活动对摩擦学行业提供了科学和技术影响（包括飞机，汽车，汽车， ，以及生物医学，疲劳敏感的应用）。全面的研究培训将授予一名研究生。由于路易斯安那州的研究投资显着低于其他州，因此该项目活动还提高了该州在纳米技术领域的研究基础和教育工作。 （ii）少数民族的教育经验：与该研究项目一起，PI开发的有关变形，疲劳和骨折的研究生/本科课程得到了增强关于疲劳现象的学习经验。