I-Corps: Auxetic Structures for Practical Applications

I-Corps：实际应用的拉胀结构

• 批准号: 1648690
• 负责人: Lesley Berhan
• 金额: $ 5万
• 依托单位: University of Toledo
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-15 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1648690&HistoricalAwards=false
• 关键词: Corps; Auxetic; Structures; Practical; Applications

The broader impact/commercial potential of this I-Corps project lies in the contribution of a framework for the development of auxetic composites that are suitable for a broad range of applications (an auxetic material, when stretched along its length, becomes thicker in width-wise directions and it becomes thinner when compressed lengthwise). This project has the potential to be pivotal in the way that auxetic materials are studied, designed and fabricated. The commercial potential spans several different industries where improved impact resistance, indentation resistance, energy and sound absorption properties, and synclastic curvature are sought. The greatest commercial impacts will be in applications requiring a combination of these properties, including personal protective equipment, and structural and noise and vibration applications in the automotive and aerospace sectors.This I-Corps project is centered on the development of negative Poisson's ratio (i.e. auxetic) composites for a wide range of commercial applications. The technology is motivated by the many attractive mechanical properties of auxetic materials. In theory, a negative Poisson's ratio material has improved hardness, impact resistance, fracture toughness, sound absorbing properties, and shear modulus over one with a positive Poissons ratio. In addition, auxetic materials exhibit synclastic curvature when bent, which means that they can be bent into a doubly curved shape, thus eliminating some of the machining necessary to fabricate curved or dome-shaped parts. Since most currently available auxetic materials and structures are porous and have low stiffness, practical structural applications remain largely elusive. This project represents a direct route to structures that exploit the benefits of auxetic materials for commercial applications. The uniqueness of the approach lies in the use of origami patterns which exhibit auxetic behavior when folded to inform the design and development of a new class of negative Poisson's ratio structures. Those structures can be realized through folding and/or additive manufacturing, with the material and length scale selection based on the specific application.

该I-Corps项目的更广泛的影响/商业潜力在于框架为开发辅助复合材料的贡献，适用于广泛的应用（辅助材料沿其长度伸展时，宽度较厚，宽度更高。明智的方向，当纵向压缩时它会变薄）。该项目有可能以研究，设计和制造辅助材料的方式保持关键。商业潜力跨越了几个不同的行业，在寻求抗冲击力，压痕耐药性，能量和声音吸收特性以及突触曲率的情况下。最大的商业影响将是需要这些特性组合的应用，包括个人防护设备，以及在汽车和航空航天部门中的结构和噪声和振动应用。该I-Corps项目以负泊松比的发展为中心（即，即。辅助）复合材料，用于广泛的商业应用。 该技术是由辅助材料的许多有吸引力的机械性能激发的。 从理论上讲，负泊松的比率材料改善了硬度，抗抗性，断裂韧性，吸收性的特性和剪切模量，而模量的剪切模含量为阳性泊松比。 此外，辅助材料在弯曲时表现出触发曲率，这意味着它们可以弯曲成双重弯曲的形状，从而消除了制造弯曲或圆顶形成部分所需的一些加工。由于目前大多数可用的辅助材料和结构都是多孔的并且刚度较低，因此实际的结构应用在很大程度上难以捉摸。 该项目代表了一种直接途径，可以利用辅助材料对商业应用的好处。该方法的独特性在于使用折纸模式，这些模式在折叠时表现出辅助行为，以告知新类负泊松比率结构的设计和开发。这些结构可以通过折叠和/或添加剂制造来实现，并根据特定应用程序的材料和长度尺度选择。