Deformation and Failure Mechanisms in Carbon Nanotube–Metal Matrix Composites at High Strain Rates

高应变率下碳纳米管金属基复合材料的变形和失效机制

• 批准号: 2223518
• 负责人: Benxin Wu
• 金额: $ 58.74万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2223518&HistoricalAwards=false
• 关键词: Deformation; Failure; Mechanisms; Carbon; Nanotube; Deformation; Failure; Mechanisms; Carbon; Nanotube

Carbon nanotube-metal matrix composites are a new class of material systems with desirable properties, such as higher strength, hardness, and impact resistance, making them suitable for applications in aerospace, automotive, construction, sports, space, and other industries. High- rate of deformation is encountered, e.g., in manufacturing processes or during service of the composite structures or parts, such as in dynamic sports contact and automobile collisions. The operative deformation mechanisms during high-rate loading of carbon nanotube-metal matrix composites, however, have not been adequately quantified and understood. This award supports integrated experimental and computational research at multiple scales to develop this fundamental understanding based on hypotheses. The knowledge gained will promote product quality, reliability, safety, and use of carbon nanotube-metal matrix composites applications. Furthermore, the award supports curriculum improvements, underrepresented minority student participation in summer research programs and long-term projects, and hands-on demonstrations at a public facility for STEM activities.The objective of this project is to understand how carbon nanotubes influence the mechanical properties and behavior of carbon nanotube-metal matrix composites at high strain rates, as compared to the base metal. To achieve this objective, multiple inter-related research tasks will be performed. Task 1 is to synthesize the base metal and the composite specimens by laser-based additive manufacturing and conduct quasi-static mechanical characterizations. Task 2 is to: (i) conduct Kolsky bar experiments to obtain stress-strain relations, (ii) perform in-situ X-ray imaging to observe cracks, and (iii) characterize microstructural changes due to Kolsky bar impacts. Task 3 is to: (i) conduct projectile impact experiments to measure Hugoniot elastic limit, dynamic strengths, and shock responses, (ii) characterize impact-induced structural changes, and (iii) & (iv) conduct hydrodynamic and molecular dynamic modeling to understand shock responses and dissipation mechanisms at the macro and atomic scale, respectively.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

碳纳米管金属基质复合材料是具有理想特性的新型材料系统，例如强度，硬度和抗冲击力，使其适合在航空航天，汽车，建筑，体育，空间和其他行业中应用。例如，在制造过程中或使用复合结构或零件（例如在动态运动接触和汽车碰撞中）遇到高变形率。然而，碳纳米管基质复合材料的高速载荷期间的手术变形机制尚未得到充分量化和理解。该奖项支持多个量表的综合实验和计算研究，以基于假设发展这种基本理解。获得的知识将促进碳纳米管基质复合材料应用的产品质量，可靠性，安全性和使用。此外，该奖项支持课程的改进，占代表性的少数族裔学生参与夏季研究计划和长期项目的参与以及在公共设施进行STEM活动的动手演示。该项目的目的是了解碳纳米管如何影响与高应变率的碳纳米纳米型纳米尺度合成率的机械性能和行为。为了实现这一目标，将执行多个相关的研究任务。任务1是通过基于激光的添加剂制造和进行准静态机械特征来合成碱金属和复合样品。任务2是：（i）进行Kolsky Bar实验以获得应力 - 应变关系，（ii）执行原位X射线成像以观察裂纹，（iii）（iii）特征是由于Kolsky bar撞击而导致的微结构变化。任务3是：（i）进行弹丸影响实验，以测量雨果弹性限制，动态强度和冲击反应，（ii）表征影响影响引起的结构变化，以及（iii）＆（iiv）进行水力动力学和分子动态模型，以理解震荡的响应和震惊的响应和耗散机制，并在途径上均分别宣传。通过使用基金会的智力优点和更广泛影响的评论标准进行评估。