CAREER: Tough Architected Concrete Materials: Bio-inspired Design, Manufacturing, and Mechanics

职业：坚韧的建筑混凝土材料：仿生设计、制造和力学

• 批准号: 2238992
• 负责人: Reza Moini
• 金额: $ 62.35万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-11-01 至 2028-10-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2238992&HistoricalAwards=false
• 关键词: CAREER; Tough; Architected; Concrete; Materials

This Faculty Career Development (CAREER) award will support fundamental research on the design and fracture behavior of concrete with purposeful arrangements known as architected materials. Concrete is the most common human-made commodity used to build civil and energy infrastructure. However, without reinforcement, concrete suffers from low resistance to cracking and abrupt failure. To improve the shortcomings in mechanical response of cement-based materials, this project will focus on understanding and engineering stronger architected concrete for use in critical civil infrastructure and resilient structural applications. By applying concepts from naturally occurring strong materials such as mother-of-pearl (nacre) and bone that contain modest constituents, new types of concrete composites will be engineered with enhanced mechanical properties, superior to everyday unreinforced concrete counterparts. Through the design and analysis of novel construction materials using a laser process and advanced additive manufacturing, this project supports new applications of stronger and more damage-resilient infrastructure components that can enhance public safety and prosperity. The project will combine experimentation, computational modeling, and analytical approaches to create new methods for studying and designing these materials. Integration of research with educational and outreach activities, including (i) software development, (ii) additive manufacturing of concrete canoe for competition, (iii) development of a bio-inspired design course module, and (iv) participation in the bilingual Día de La Ciencia/Science Day program, will facilitate the use, adoption, and education among engineers, users, and students.The goal of this project is to understand and engineer the fracture behavior of architected concrete inspired by the brick-and-mortar arrangement of nacre and tubular arrangement of osteons in cortical bone. The research program will inform a new understanding of hypothesized toughening mechanisms from biological materials for the design, fabrication, and engineering of unreinforced concrete with enhanced ductility and fracture toughness benchmarked against ordinary and fiber-reinforced counterparts. To achieve these outcomes, the research integrates the following objectives: (i) study the underlying toughening mechanisms in natural materials and develop bio-inspired principles for design of synthetic counterparts and engineering the formulations of hard cementitious and soft hyperelastic constituents, (ii) create efficient manufacturing processes that enable fabrication of morphologically tailored hard-soft multi-material assemblies with purposeful internal defects, (iii) develop research and educational software and toolpath algorithms for additive processes that advance the design and fabrication, (iv) develop suitable experimentation for examining fracture toughness and strength of the architected materials and hard-soft constituents’ interfaces, and (v) develop a numerically robust constitutive framework for modeling fracture behavior in architected assemblies of soft and hard materials. The framework will utilize the phase-field approach to capture crack propagation within the bulk of the soft and hard materials, supplemented with a cohesive-zone model for the interfaces. The project will develop a foundation for understanding, engineering, and predicting the mechanical performance of tough architected composites and will generate new research avenues and design possibilities for crack-resilient applications. The project will allow the PI to advance the knowledge base in fracture mechanics and establish his long-term career in design and advanced manufacturing.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.

该教师职业发展（CAREER）奖将支持混凝土的设计和断裂行为的基础研究，以及被称为建筑材料的有目的的安排。混凝土是用于建设民用和能源基础设施的最常见的人造商品。然而，如果没有钢筋，混凝土的抗裂性和突然破坏能力就会降低。为了改善水泥基材料机械响应的缺点，该项目将重点了解和设计用于关键土木基础设施和弹性结构应用的更坚固的建筑混凝土。通过应用珍珠母（珍珠质）和含有少量成分的骨头等天然存在的坚固材料的概念，新型混凝土复合材料将具有增强的机械性能，优于日常的无筋混凝土同类产品。通过使用激光工艺和先进增材制造来设计和分析新型建筑材料，该项目支持更强大、更抗损伤的基础设施组件的新应用，从而增强公共安全和繁荣。该项目将结合实验、计算建模和分析方法来创建研究和设计这些材料的新方法。将研究与教育和外展活动相结合，包括（i）软件开发，（ii）用于竞赛的混凝土独木舟增材制造，（iii）开发仿生设计课程模块，以及（iv）参与双语 Día de La Ciencia/科学日计划，将促进工程师、用户和学生的使用、采用和教育。该项目的目标是了解和设计混凝土独木舟的断裂行为 建筑混凝土的灵感来自于珍珠质的砖块和砂浆排列以及皮质骨中骨管的管状排列。该研究计划将有助于人们对生物材料假设的增韧机制有新的认识，用于设计、制造和工程无筋混凝土，以普通和纤维增强混凝土为基准，增强延展性和断裂韧性。为了实现这些成果，该研究整合了以下目标：（i）研究天然材料的潜在增韧机制，并开发仿生原理来设计合成对应物并设计硬水泥和软超弹性成分的配方，（ii）创建高效的制造工艺，能够制造具有故意内部缺陷的形态定制的硬软多材料组件，（iii） 开发用于推进设计和制造的增材工艺的研究和教育软件和刀具路径算法，(iv) 开发合适的实验来检查建筑材料和硬软成分界面的断裂韧性和强度，以及 (v) 开发一个数值稳健的本构框架，用于对软硬材料的建筑组件中的断裂行为进行建模。该框架将利用相场方法来捕获大量软硬材料内的裂纹扩展，并辅以界面的内聚区模型。该项目将为理解、设计和预测坚韧复合材料的机械性能奠定基础，并将为抗裂应用提供新的研究途径和设计可能性。该项目将使 PI 能够推进断裂力学的知识基础，并在设计和先进制造领域建立他的长期职业生涯。该奖项反映了 NSF 的法定使命，并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，被认为值得支持。