Advanced Impact Resistant Auxetic Materials via Additive Manufacturing

通过增材制造先进的抗冲击拉胀材料

• 批准号: RGPIN-2020-05586
• 负责人: Doman, Darrel
• 金额: $ 1.97万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=717707
• 关键词: Advanced; Impact; Resistant; Auxetic; Materials

Auxetic materials, often referred to as “metamaterials” or “negative Poisson's ratio materials”, are counter-intuitive in their response to deformation. Upon being stretched they will expand and conversely will contract when compressed. This behavior makes them very attractive for impact applications; upon being compressively loaded at high rates they will tend to supply increased resistance. As such there are several commercial auxetic products currently available, notably athletic footwear produced by the world's largest manufacturer. However, broader application of auxetic materials is only now garnering significant attention with the advent of additive manufacturing (AM). AM is a manufacturing method in which very complex geometries can be printed out of a wide variety of materials. Recently, AM has been applied to the manufacture of auxetics with the aim of leveraging the advantages of AM, namely the ability to print curved and graded materials. However, the current efforts have been limited to relatively small sizes and/or have not been experimentally tested at scale. A design tool is needed to bridge the technology gap between lab-scale AM auxetics and engineering auxetic commercially-ready products that have large sizes (on the order of tens of centimeters). The short-term objectives of the proposed work is to develop a validated design tool that can virtually simulate auxetic materials. This design tool is needed to accelerate the development of auxetic products for impact applications. The long-term objective is to harness the advantages of AM to address a well-known inequality in impact protective gear where female-specific athletics footwear and ballistic body armor are well-known needs. These needs are currently very sparsely filled due to the high manufacturing costs for sex-specific products. Through the use of the proposed design tool, this work aims to provide a technological means of accelerating the development of these needed footwear and armor products more realistic.

拉胀材料通常被称为“超材料”或“负泊松比材料”，其对变形的响应是反直觉的。当被拉伸时，它们会膨胀，相反，当被压缩时，它们会收缩。这种行为使它们对于冲击应用非常有吸引力；在高速率压缩负载后，它们往往会提供更大的阻力。因此，目前有几种商业拉胀产品可供选择，特别是由世界上最大的制造商生产的运动鞋。 然而，随着增材制造 (AM) 的出现，拉胀材料的更广泛应用现在才引起人们的广泛关注。增材制造是一种可以用多种材料打印出非常复杂的几何形状的制造方法。最近，增材制造已应用于拉胀材料的制造，目的是利用增材制造的优势，即打印弯曲和渐变材料的能力。然而，当前的努力仅限于相对较小的尺寸和/或尚未进行大规模的实验测试。需要一种设计工具来弥合实验室规模的增材制造拉胀与大尺寸（大约数十厘米）的工程拉胀商业产品之间的技术差距。 拟议工作的短期目标是开发一种经过验证的设计工具，可以虚拟地模拟拉胀材料。需要该设计工具来加速冲击应用的拉胀产品的开发。长期目标是利用增材制造的优势来解决冲击防护装备方面众所周知的不平等问题，其中女性专用运动鞋和防弹防弹衣是众所周知的需求。由于特定性别产品的制造成本高昂，目前这些需求很少得到满足。通过使用所提出的设计工具，这项工作旨在提供一种技术手段，加速开发这些所需的鞋类和盔甲产品，使其更加现实。