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

CAREER: Understanding the Combined Effect of Microstructure and Topology on the Mechanical Behavior of Additively Manufactured Lattice Structures

职业：了解微观结构和拓扑对增材制造晶格结构机械行为的综合影响

基本信息

批准号：
2223314
负责人：
Kavan Hazeli
金额：
$ 54万
依托单位：
University of Arizona
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-10-01 至 2025-08-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2223314&HistoricalAwards=false
关键词：
CAREER Understanding Combined Effect Microstructure

项目摘要

This Faculty Early Career Development (CAREER) grant, co-funded by the Established Program to Stimulate Competitive Research (EPSCoR), focuses on understanding the mechanical behavior of additively manufactured lattice structures (AMLS). AMLS are hierarchical materials whose effective properties depend upon both the topology of the lattice structure and the base metallic material microstructure. Therefore, understanding the interplay between topology and microstructure is necessary to maximize the potential application of AMLS. In general, one of the major factors that limits a complex engineering system’s performance is that conventional structural metallic materials serve a singular purpose of providing structural support. However, flexibility in the design of AMLS enables an array of multifunctional applications, such as controlled heat transfer, vibration, energy management, and light-weighting. In this research, the potential of AMLS will be enhanced with an in-depth experimental-computational investigation of the combined role of microstructure and topology in the mechanical deformation mechanisms that control the mechanical behavior over a wide range of loading conditions. The educational part of this grant will provide: (1) an opportunity to senior design teams to build educational tools and techniques to teach mechanical engineering concepts to people with visual impairment; and (2) a hands-on research opportunity to low-income students.The research objectives of this project are understanding the specific contribution and interplay between the microstructurally driven mechanisms (e.g., those due to grain structures, orientation, and porosity) and geometrically driven events (e.g., unit-cell buckling, node fracturing, and macroscopic shear) on the deformation of AMLS, and determining which mechanisms dominate under different loading conditions. In order to elucidate the specific contribution of local microstructural features relative to topological attributes, experimental data obtained from microstructural and mechanical behavior characterization will be coupled with the local state of stress computed from finite element (FE) simulations. The FE analysis will use a yield criterion that will be customized for AMLS to capture the anisotropic behavior of the struts originating from the repeated solid-phase changes during layer deposition. The new yield criterion will be built based on the strut-level tension, compression, and shear experiments for different microstructures controlled by heat-treatment.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（CAREER）补助金由刺激竞争研究的既定计划（EPSCoR）共同资助，重点是了解增材制造晶格结构（AMLS）的机械行为。AMLS是分级材料，其有效性能取决于晶格结构的拓扑结构和基体金属材料的微观结构。因此，了解拓扑结构和微观结构之间的相互作用是必要的，以最大限度地提高AMLS的潜在应用。通常，限制复杂工程系统性能的主要因素之一是传统结构金属材料仅用于提供结构支撑。然而，AMLS设计的灵活性使一系列多功能应用成为可能，例如受控传热、振动、能量管理和轻量化。在这项研究中，AMLS的潜力将得到加强，深入的实验-计算研究的微观结构和拓扑结构的综合作用的机械变形机制，控制在很宽的范围内的负载条件下的机械行为。该资助的教育部分将提供：（1）一个机会，高级设计团队建立教育工具和技术，教机械工程概念的人有视力障碍;和（2）一个动手研究的机会，低收入的学生。该项目的研究目标是了解具体的贡献和相互作用之间的微观驱动机制（例如，由于晶粒结构、取向和孔隙度引起的那些）和几何驱动事件（例如，单元屈曲，节点断裂，宏观剪切）对AMLS变形的影响，并确定在不同的加载条件下，哪些机制占主导地位。为了阐明局部微观结构特征相对于拓扑属性的具体贡献，从微观结构和力学行为表征获得的实验数据将与有限元（FE）模拟计算的局部应力状态相结合。FE分析将使用为AMLS定制的屈服准则，以捕获层沉积期间重复固相变化引起的支柱各向异性行为。新的屈服准则将建立在热处理控制的不同微观结构的支柱级拉伸、压缩和剪切实验的基础上。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。