Fabrication and Mechanical Behavior of Hierarchical Architected Metamaterials

分层架构超材料的制造和机械行为

• 批准号: 2124826
• 负责人: Costas Grigoropoulos
• 金额: $ 76.26万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2124826&HistoricalAwards=false
• 关键词: Fabrication; Mechanical; Behavior; Hierarchical; Architected

This grant supports advanced manufacturing through a study of multiphoton lithography of hierarchical architected metamaterials, providing an avenue for both scientific and technological progress which contributes to national prosperity. Multiphoton lithography is an additive manufacturing technique that enables the printing of complex structures in three dimensions with nanoscale features and resolution. While the principles of laser-material interactions for photopolymerization are well understood, their effects on the mechanical properties of the printed material have not been studied thoroughly. This poses obstacles in the modeling of such structures and their utility in functional material systems. This award supports the fundamental research required to unravel the effects of multiphoton lithography on the mechanical behavior and efficient design of 3D structures such as bioscaffolds. This project enables accurate modeling of the mechanical response of these structures in relation to the processing parameters. Furthermore, it paves the way for the scalability of multiphoton lithography and its use in diverse fields, including healthcare, bioengineering, and aerospace. The results from this research constitute a critical asset in the U.S. economy and society. The research involves several disciplines, including manufacturing, materials science, mechanics, and biochemistry. This multi-disciplinary approach serves as a catalyst for positive impact in engineering education for women and underrepresented minority students.Multiphoton lithography (MPL) can surpass several barriers related to the fabrication of extremely complex, mechanically robust three-dimensional (3D) structures in nano- and microscale. However, a major obstacle hindering advance of the scalability and wide applicability of this technique is the limited understanding on the constitutive mechanical behavior of the fabricated materials as a function of the processing parameters. This research is designed to comprehend the effect of MPL fabrication parameters on the mechanical behavior of hierarchical architected metamaterials. Through ex situ TEM analysis of defect formation and in situ SEM mechanical testing experiments, the mechanical performance of these materials is evaluated with respect to properties such as ductility, strength, critical fracture toughness and therefore enable accurate constitutive modeling of these materials. These models involve finite element analysis (FEA) and molecular dynamics (MD) simulations towards predicting the mechanical performance of complex 3D structures, validated through the design and manufacture of bioscaffolds that can possess multifunctional behavior. The results of the characterization experiments are used to reveal the enhanced mechanical performance and scalability of the architected material designs, thereby elucidating the full potential of MPL.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.

该补助金通过对分层结构超材料的多光子光刻研究来支持先进制造业，为促进国家繁荣的科学和技术进步提供了途径。多光子光刻是一种增材制造技术，能够以纳米级特征和分辨率在三维中打印复杂结构。虽然光聚合的激光-材料相互作用的原理已经很好地理解，但它们对印刷材料的机械性能的影响还没有得到彻底的研究。这对这种结构的建模及其在功能材料系统中的应用构成了障碍。该奖项支持解开多光子光刻对生物支架等3D结构的机械行为和有效设计的影响所需的基础研究。该项目能够精确建模这些结构的机械响应与加工参数的关系。此外，它为多光子光刻的可扩展性及其在医疗保健，生物工程和航空航天等不同领域的应用铺平了道路。这项研究的成果构成了美国经济和社会的重要资产。该研究涉及多个学科，包括制造，材料科学，力学和生物化学。这种多学科的方法是一种催化剂，对妇女和少数民族学生的工程教育产生积极影响。多光子光刻（MPL）可以克服与制造极其复杂的纳米和微米级机械坚固的三维（3D）结构相关的几个障碍。然而，阻碍这种技术的可扩展性和广泛适用性的一个主要障碍是对所制造的材料的本构力学行为作为加工参数的函数的理解有限。本研究旨在了解MPL制作参数对分层结构超材料力学行为的影响。通过对缺陷形成的非原位TEM分析和原位SEM力学测试实验，这些材料的机械性能相对于诸如延展性、强度、临界断裂韧性等性质进行评估，从而能够对这些材料进行准确的本构建模。这些模型涉及有限元分析（FEA）和分子动力学（MD）模拟，用于预测复杂3D结构的机械性能，并通过设计和制造具有多功能行为的生物支架进行验证。表征实验的结果被用来揭示增强的机械性能和可扩展性的建筑材料设计，从而阐明了MPL的全部潜力。该奖项反映了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。

项目成果

Systematic design of Cauchy symmetric structures through Bayesian optimization

• DOI: 10.1016/j.ijmecsci.2022.107741
• 发表时间: 2022-09
• 期刊: International Journal of Mechanical Sciences
• 影响因子: 7.3
• 作者: Haris Moazam Sheikh;Timon Meier;Brian W Blankenship;Z. Vangelatos;Naicheng Zhao;P. Marcus;C. Grigoropoulos