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

• 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

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.

这个教师早期职业发展计划（CAREER）奖支持研究，以产生与新兴的一类独特材料相关的新知识，称为MAX阶段。这些混合金属陶瓷材料形成原子级的层，就像堆叠在一起的纸片，这使得层在负载下局部扭结而不是破裂。 这种扭结行为最近才被发现，但如果理解，有可能为我们国家老化的能源，通信和运输系统提供更坚固，更轻和更耐损伤的材料。 因此，MAX阶段将在各种真实负载条件下（包括冲击、动态疲劳和断裂），采用不同的堆叠顺序和层方向进行研究。 此外，实验技术，利用先进的高速成像加上表面加速度映射在这些复杂的加载情况下，将执行，能够提取更多的材料行为信息比经典技术。 这些发现将为利用MAX阶段以及其他类似先进材料的结构设计中的预测计算模型提供有意义的输入。这项工作汇集了材料科学，应用和理论力学的多学科努力。通过舞蹈力学教育和推广计划，将使所有年龄段的未开发的当地社区能够获得新的手段。研究和推广部分突出了两者所涉及的内在创造力和相关性，旨在激励下一代STEAM（科学，技术，工程，艺术和数学）爱好者。 这项研究的重点是一类新兴的材料，MAX相，一个家庭的层状六角早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ripplocations，纳米级屈曲现象，它以不同于塑性中的位错运动或断裂中的键断裂的方式容纳应变，并导致在载荷下形成非线性带（NKB）。 虽然材料科学界的一个显着部分正在研究这些3D分层固体，相对较少的研究存在追求他们的行为在介观到连续水平。 这项工作旨在通过三个高度综合的实验研究重点来填补这一空白。 第一个特征的变形行为变化的应变速率和应力状态，以及层的取向和堆叠序列，利用非线性屈曲理论，以确定在NKB形成的驱动参数。第二个量化裂纹尖端能量动态断裂利用混合实验-数值方案，以及探讨冲击疲劳，扩展经典的巴黎法律的时间效应。 第三个追求的破坏行为，进行惯性冲击实验，利用网格法和虚拟领域的方法，一个新兴的逆技术。对MAX相的广泛研究将揭示跨长度和时间尺度的竞争韧性，伪韧性和脆性变形机制，从而为系统地捕获，理解和优化这些独特的层状固体做出重大贡献。更广泛地说，这些发现将有助于理解各向异性材料如何适应复杂载荷条件下的应变，并为特定纹理（缺陷工程），功能梯度和/或分层材料设计铺平道路。该奖项反映了NSF的法定使命，并被认为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来支持。

项目成果

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

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

• DOI: 10.1080/10400419.2021.2005858
• 发表时间: 2021
• 期刊: Creativity Research Journal
• 影响因子: 2.6
• 作者: Mendoza, Isabella;Will-Cole, Alexandria;Lamberson, Leslie
• 通讯作者: Lamberson, Leslie