Fatigue Response of Nanostructured Metallic Materials

纳米结构金属材料的疲劳响应

• 批准号: 0527779
• 负责人: T. Venkatesh
• 金额: --
• 依托单位: Tulane University
• 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 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0527779&HistoricalAwards=false
• 关键词: Fatigue; Response; Nanostructured; Metallic; Materials

Abstract 0527779Recent 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. Furthermore, the modified coursework is also targeted towards enhancing the undergraduate learning experience for minority students at Xavier University, a Historically Black College and University, through it's "3+2" program with the School of Engineering at Tulane University, where Xavier undergraduates complete a pre-engineering curriculum in three years and then complete their engineering courses at Tulane. (iii) Research experience for minorities: By working with the Louisiana Alliance for Minority Participation program, the PI's research group also provides summer research opportunities for undergraduate students in the area of fatigue of nanomaterials.

摘要0527779最近的研究工作表明，纳米结构的材料表现出显着的机械性能，如屈服强度，硬度和耐磨性的增强，当与传统的“微结构”材料。然而，纳米结构材料的疲劳和断裂行为的全面理解是目前不可用的。此外，通过创建纳米结构表面层/涂层来提高传统材料的疲劳寿命的潜力还没有被足够深入地探索。因此，该项目旨在获得对纳米结构材料中疲劳现象的关键见解。通过一种方法，结合分析建模，数值建模，并在模型纳米结构金属系统的实验（镍和铁），本研究奠定了基础：（i）基本了解的平面疲劳和疲劳裂纹扩展响应的纳米结构材料，（ii）定量评估的接触疲劳响应的纳米结构材料，（iii）纳米结构材料，（iv）纳米结构材料，（v）纳米结构材料。（iii）一种新的粘附模型在纳米结构材料接触疲劳裂纹萌生预测中的独特应用;以及（iv）一种简化的纳米结构材料接触疲劳寿命预测数值模型的发展。目前的研究在以下三个层面产生了广泛的影响：（i）研究：通过推进目前对纳米结构材料疲劳机制的理解，研究活动在摩擦学行业（包括飞机，汽车和生物医学，疲劳敏感应用）中产生了科学和技术影响。向一名研究生提供全面的研究培训。由于路易斯安那州的研究投资一直明显低于其他州，该项目活动也增强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：结合这一研究项目，加强了PI开发的关于变形、疲劳和断裂的研究生/本科生课程，为课堂上关于疲劳现象的学习经验提供了一个令人兴奋的动手实验部分。此外，修改后的课程还旨在通过与杜兰大学工程学院的“3+2”计划，增强泽维尔大学少数民族学生的本科学习体验，这是一所历史悠久的黑人学院和大学，泽维尔大学的本科生在三年内完成了工程预科课程，然后在杜兰大学完成了工程课程。(iii)少数民族的研究经验：通过与路易斯安那州少数民族参与计划联盟合作，PI的研究小组还为纳米材料疲劳领域的本科生提供夏季研究机会。