CAREER: Mechanics of a New Family of Auxetic Chiral Composites

这个学院早期职业发展（Career）项目将研究一种具有独特变形机制并能在大变形下保持形变效应的新型手性复合材料的力学行为。本文将基于解析力学模型，发明一种新的辅助手性复合材料家族，并通过有限元模拟、微极性理论和多材料3d打印样品的力学实验来探索其变形机理。同时，由于显著的局部旋转，这些新的微结构材料为微极性理论的应用提供了很好的例子，并将用于推进这一重要理论在力学中的应用。增材制造（3D打印）的快速发展使微结构混合材料的几何形状和材料组成能够轻松精确地控制，为推动力学边界提供了前所未有的机会。这项提出的研究揭示了使用3D打印作为工具来推进现有力学理论和验证新的工程概念的范例。关于这一新型补体手性复合材料的力学新知识的创造，有望在设计用于机械保护和能量吸收的轻质材料、改善公共卫生的生物医学材料和设备、超材料和机械适应性复合材料方面具有潜在的广泛应用。外联和参与活动被设计成与教育活动相结合，并将主要集中在参与和保留代表性不足的群体，通过将看似传统的机械工程概念与创新的跨学科概念结合起来。这将通过(1)吸引不同层次的参与者，从研究生和本科生，中小学生和教师到实践工程师，(2)加强力学，仿生学和增材制造学科内部和跨学科的课程，(3)与当地，中小规模和高附加值行业合作，促进知识传播和技术转移。(4)开展K-12外展活动，以支持新发布的“下一代科学标准”。

This Faculty Early Career Development (CAREER) project will investigate the mechanical behavior of a new family of auxetic chiral composites which have unique deformation mechanisms and can preserve auxetic effects under large deformations. Based on an analytical mechanical model, a new family of auxetic chiral composites will be invented and their deformation mechanisms will be explored by finite element simulations, micro-polar theory, and mechanical experiments on multi-material 3D-printed specimens. Simultaneously, due to significant local rotation, these new micro-architectured materials provide excellent examples on the application of micro-polar theory and will be used to advance this important theory in mechanics. The rapid development of additive manufacturing (3D printing) enables easy and precise control of the geometry and material composition of micro-architectured hybrid materials, providing unprecedented opportunities to push the boundary of mechanics. This proposed research reveals a paradigm for using 3D printing as a tool to advance existing theories in mechanics and verify new engineering concepts.The creation of new knowledge on the mechanics of this new family of auxetic chiral composites is expected to have potential broad applications in designing lightweight materials for mechanical protection and energy absorption, biomedical materials and devices to improve public health, and metamaterials and mechano-adaptive composites. The outreach and engagement activities are designed to be integrated with the educational activities and will be largely focused on the engagement and retention of underrepresented groups by threading seemingly traditional mechanical engineering concepts with innovation interdisciplinary concepts. This will be accomplished by (1) engaging participants across all different levels, from graduate and undergraduate students, elementary and middle school students and teachers to practicing engineers, (2) strengthening curriculum within and across the disciplines of mechanics, biomimetics, and additive manufacturing, (3) collaborating with local, small/middle scale, and high-added value industries to facilitate knowledge dissemination and technology transfer, and (4) developing K-12 outreach activities to support the newly released Next Generation Science Standards.