CAREER: Integrated Research and Education on the Dynamic Behavior of Metal-ceramic Layered Solids

职业：金属陶瓷层状固体动态行为的综合研究和教育

基本信息

批准号：
1939838
负责人：
Leslie Lamberson
金额：
$ 48.86万
依托单位：
Colorado School of Mines
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-07-01 至 2024-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1939838&HistoricalAwards=false
关键词：
CAREER Integrated Research Education Dynamic

项目摘要

This Faculty Early Career Development Program (CAREER) award supports research to generate new knowledge related to an emerging class of unique materials, known as MAX phases. These hybrid metal-ceramic materials form layers on the atomistic scale, much like pieces of paper stacked together, which allows the layers to locally kink instead of crack under load. This kinking behavior has only recently been discovered, yet if understood, has the potential to provide tougher, lighter and more damage-tolerant materials for our nation's aging energy, communication and transportation systems. As a result, MAX phases will be investigated with varying stacking sequences and layer orientations across a variety of real-world loading conditions, including impact, and dynamic fatigue and fracture. In addition, experimental techniques utilizing cutting edge high-speed imaging coupled with surface acceleration mapping under these complex-loading scenarios will be performed, that are able to extract more material behavior information than classical techniques. These findings will provide meaningful input for predictive computational models in structural design leveraging MAX phases, as well as other similar advanced materials. This work brings together multidisciplinary efforts in materials science, and applied and theoretical mechanics. Novel means to reach untapped local communities at all ages will be enabled through a dance-mechanics education and outreach program. The research and outreach components highlight the innate creativity and correlations involved in both, and aims to inspire the next generation of STEAM (science, technology, engineering, arts and mathematics) enthusiasts. This research focuses on an emerging class of materials, MAX phases, a family of layered hexagonal early transition-metal carbides and nitrides. These materials exhibit a newly classified defect deformation mechanism termed ripplocations, a nanoscale buckling phenomena, which accommodates strain in a different manner than dislocation motion in plasticity or bond rupture in fracture, and leads to the formation of nonlinear kind bands (NKB) under load. While a notable portion of the materials science community is examining these 3D layered solids, relatively little research exists pursuing their behavior on the meso- to continuum level. This effort aims to fill that gap through three highly integrated experimental research foci. The first characterizes deformation behavior varying strain rate and stress states, as well as layer orientation and stacking sequences, utilizing nonlinear buckling theory to determine the driving parameters in NKB formation. The second quantifies crack tip energetics in dynamic fracture leveraging a hybrid experimental-numerical scheme, as well as explores impact fatigue, extending the classic Paris Law for temporal effects. The third pursues damage behavior, conducting inertial impact experiments exploiting the Grid Method and the Virtual Fields Method, an emerging inverse technique. The extensive investigations on MAX phases will shed light on competing ductile, pseudo-ductile and brittle deformation mechanisms across length and time scales, thus making a significant contribution towards systemically capturing, understanding and optimizing these unique layered solids. More broadly, the findings will help understand how anisotropic materials accommodate strain under complex loading conditions, and paves the way for specifically textured (defect engineered), functionally graded, and/or hierarchical material design.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.

这项教师早期职业发展计划（职业）奖支持研究，以产生与新兴类别的独特材料（称为最大阶段）相关的新知识。这些混合金属陶瓷材料在原子尺度上形成层，就像堆叠在一起的纸一样，这使得层可以局部扭结而不是载荷下的裂纹。直到最近才发现这种扭结行为，但是如果被理解，它有可能为国家的老化能源，通信和运输系统提供更严格，更轻，更容易受损的材料。结果，将通过各种现实世界加载条件（包括撞击，动态疲劳和断裂）进行不同的堆叠序列和层方向研究最大阶段。此外，将执行利用尖端高速成像以及在这些复杂加载场景下的表面加速度映射的实验技术，这些技术将与经典技术相比提取更多的物质行为信息。这些发现将为结构设计中的预测计算模型以及其他类似的高级材料提供有意义的输入。这项工作汇集了材料科学和应用和理论力学方面的多学科工作。通过舞蹈机械教育和外展计划，将启用各个年龄段尚未开发的当地社区的新颖手段。研究和外展组件强调了两者中涉及的先天创造力和相关性，并旨在激发下一代Steam（科学，技术，工程，艺术和数学）爱好者。这项研究重点是新兴的材料，最大阶段，一个分层的六角形早期过渡金属碳化物和氮化物。这些材料表现出一种新分类的缺陷变形机制，称为起裂，一种纳米级屈曲现象，该现象以与骨折中可塑性或键破裂的脱位运动不同，并导致载荷下的非线性类型带（NKB）的形成。虽然材料科学界的显着部分正在研究这些3D层次的固体，但在中间至连续水平上追求其行为的研究相对较少。这项工作旨在通过三个高度集成的实验研究重点来填补这一空白。第一个表征变形行为改变应变率和应力状态，以及层方向和堆叠序列，利用非线性屈曲理论来确定NKB形成中的驱动参数。第二次量化了利用混合实验性数字方案的动态断裂中的裂纹尖端能量学，并探讨了影响疲劳，从而扩展了经典的巴黎定律以实现时间影响。第三个追求损害行为，进行惯性影响实验，利用网格方法和虚拟场方法，一种新兴的逆技术。对最大阶段的广泛研究将阐明长度和时间尺度上的竞争性延展性，伪造性和脆性变形机制，从而为在系统捕获，理解和优化这些独特的分层固体方面做出了重大贡献。更广泛地说，这些发现将有助于了解各向异性材料如何在复杂的负载条件下适应压力，并为特殊纹理（缺陷工程），功能分级和/或分层材料设计铺平了道路。该奖项反映了NSF的法规任务，并被认为是通过基金会的知识优点和广泛的crietia criter scriter criter criter criter criter criter criter criter criter criter criter criter criter criter criter criter criteria criter criteria criter criteria criteria criteria criteria crietia criteria criteria crietia awardia奖。

项目成果

期刊论文数量（3）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Ripplocations: A universal deformation mechanism in layered solids

DOI：
10.1103/physrevmaterials.3.013602
发表时间：
2019-01-02
期刊：
PHYSICAL REVIEW MATERIALS
影响因子：
3.4
作者：
Barsoum, M. W.;Zhao, X.;Tucker, G. J.
通讯作者：
Tucker, G. J.

Effect of grain orientation on the compressive response of highly oriented MAX phase Ti3SiC2

DOI：
10.1016/j.msea.2021.140869
发表时间：
2021-02
期刊：
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
影响因子：
6.4
作者：
Xingyuan Zhao;M. Sokol;M. Barsoum;L. Lamberson
通讯作者：
Xingyuan Zhao;M. Sokol;M. Barsoum;L. Lamberson

The Mechanics of Dance: Using Parametric Equations as Inspiration for Dance Choreography

舞蹈力学：使用参数方程作为舞蹈编排的灵感