权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Concurrent Multiscale Moving-Window Scheme for Shock Wave Interaction with Material Microstructure

冲击波与材料微观结构相互作用的并行多尺度移动窗口方案

基本信息

批准号：
1950488
负责人：
Vinamra Agrawal
金额：
$ 40.82万
依托单位：
Auburn University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-06-01 至 2024-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1950488&HistoricalAwards=false
关键词：
Concurrent Multiscale Moving Window Scheme

项目摘要

Shock waves occur in a material when it is subjected to extreme pressure and temperature changes in a very short time. This is commonly observed in applications when a material is subjected to high speed impact. The need to design advanced materials resistant to shock damage has driven the research into the material's response to shock waves from the nano- and micro-meter scales to the large application scale. This grant, co-funded by the Established Program to Stimulate Competitive Research (EPSCoR), supports fundamental research into the multiscale response of the material when subjected to shock loading. It will provide new knowledge on how shock waves interact with material features at the micro and nano scales leading to deformation and failure at the macroscale. The research will accelerate the design of advanced materials with superior shock resistant properties for n aerospace, automotive, infrastructure and defense industries. Additionally, the project will provide opportunities to educate and train graduate and undergraduate students in the interdisciplinary areas of materials science, computational mechanics, and applied physics and mathematics through research in the laboratory. The PI will also engage in outreach activities related to science and engineering to K-12 students through university programs. Shock response of the material is multiscale in nature, introducing defects such as voids and dislocations at the microscale and cracks and plastic deformation at the macroscale. This work develops a concurrent multiscale method, with coexisting atomistic and continuum domains, to study shock wave propagation through a material and its interaction with material microstructure. State of the art concurrent multiscale schemes are unable to capture high speed dynamic processes such as shock waves and moving atomistic regions. The framework uses a control volume based moving-window scheme, where the atomistic domain follows a moving shock wave, to circumvent issues with current state of the art schemes. Using this new framework, the work will study microstructural evolution, shock induced defect generation, and the influence of microstructural features such as grain boundaries on shock resistance properties, e.g., spall strength. The framework will be systematically validated against existing experimental data on shock induced defect generation available in the literature.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.

当材料在很短的时间内受到极端压力和温度变化时，就会发生冲击波。这通常在材料经受高速冲击时的应用中观察到。设计抗冲击损伤的先进材料的需求推动了对材料对冲击波响应的研究从纳米和微米尺度到大的应用规模。这项赠款由刺激竞争研究的既定计划（EPSCoR）共同资助，支持对材料在受到冲击载荷时的多尺度响应进行基础研究。它将提供有关冲击波如何在微观和纳米尺度上与材料特征相互作用，从而导致宏观尺度上的变形和失效的新知识。这项研究将加速设计具有上级抗冲击性能的先进材料，用于航空航天、汽车、基础设施和国防工业。此外，该项目将提供机会，教育和培训研究生和本科生在材料科学，计算力学，应用物理和数学的跨学科领域，通过在实验室的研究。PI还将通过大学课程参与与科学和工程相关的K-12学生的外联活动。材料的冲击响应在本质上是多尺度的，在微观尺度上引入缺陷，如空洞和位错，在宏观尺度上引入裂纹和塑性变形。本文发展了一种原子域和连续域共存的并行多尺度方法来研究冲击波在材料中的传播及其与材料微结构的相互作用。现有的并行多尺度方法无法捕捉高速的动态过程，如冲击波和运动的原子区域。该框架使用基于控制体积的移动窗口方案，其中原子域遵循移动冲击波，以规避当前最先进方案的问题。使用这个新的框架，这项工作将研究微观结构的演变，冲击引起的缺陷的产生，以及微观结构特征，如晶界对抗冲击性能的影响，例如，层裂强度该框架将系统地验证现有的实验数据冲击引起的缺陷产生在literation.This奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。