Auxetic Blast Protection Textiles -Crime Feasibility Study

拉胀防爆纺织品 - 犯罪可行性研究

• 批准号: EP/D036690/1
• 负责人: Kenneth Evans
• 金额: $ 6.25万
• 依托单位: UNIVERSITY OF EXETER
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD036690%2F1
• 关键词: Auxetic; Blast; Protection; Textiles; Crime

This proposal concerns a study to examine the feasibility of constructing a blast-protection textile based on the highly unusual properties exhibited by helical auxetic yarns recently developed at the University of Exeter. An auxetic material is one which has a negative Poisson's ratio, (n). This means that, unlike conventional materials (with a positive Poisson's ratio) that get thinner when stretched, an auxetic material will get fatter. This unusual behaviour can be exploited to construct structures which can work in ways that have not previously been possible. This study will focus on further developing and exploiting the properties of helical fibre bundles with an auxetic geometry. The bundles developed at Exeter show auxetic functionality from zero to full strain; where the magnitude of the auxetic effect is also far superior. The bundles can also be produced in large quantities using conventional fabric weaving techniques. These features will enable the unique properties of auxetics to be utilised in a commercial application, - initially in the development of a new generation of smart blast protection fabrics. Bomb blast net curtains were invented for reducing hazards associated with explosion incidents. Glass is often the weakest part of a building, breaking at low pressures. Breakage can extend for many miles after a large explosion, and high velocity glass fragments are a major contributor to injuries in such incidents. Typically, many more people are hurt in explosions than are killed. By providing potential targets with window protection, laceration injuries are significantly reduced. Current blast curtain design favours the use of aramid nets. When an explosion occurs, the curtains are designed to billow out and capture a significant portion of the glass fragments. However in practice, the net fabric is often torn by the force of the blast. This is because the net filaments have to be made thin to keep the curtain from blocking light out. What is needed is a smart textile that allows light through but is also capable of containing the huge forces involved in an explosion and provides a barrier to flying debris. The project aims are to research how different auxetic fabrics and weaves respond to blast waves, and how far this behaviour can be used to mitigate the effects of explosions. It is intended that the study will culminate in the design, manufacture and test of several pre-production prototype textiles. There are several potential uses for auxetic textiles. One solution would involve the deployment of a smart auxetic fabric in a stretched open cell arrangement that would be translucent, enabling the curtains to be used at all times. In the event of an explosion, the curtain weave would be triggered to collapse by the initial shock wave, the fabric would shrink in resulting in a much tighter textile that would present an effective barrier to glass and other flying debris. Alternatively these yarns can be exploited to create a laminated textile which responds to the onset of a blast front by opening up arrays of pores in each layer. These let the blast wave pass through from one layer to the next, successively dispersing the energy it carries. Such textiles would not only be barriers to flying debris but also act to diminish the effects of the initial blast shock wave. Different parameters within the basic design may be altered to allow the system to be refined - these include fibre winding angles, fibre diameters and the basic characteristics of the materials used. The methodology used in the study will be to follow a project work programme broken down into a series of work packages, using milestones to focus activity and measure progress. Exeter and Auxetics Ltd will be responsible for the main body of research work throughout. Heathcoats ltd will be involved in weaving tests and the production of trial fabrics, and the PSDB will conduct the final blast testing of candidate textiles.

该提案涉及一项研究，旨在检验基于埃克塞特大学最近开发的螺旋拉胀纱线所表现出的极不寻常的特性构建防爆纺织品的可行性。拉胀材料是具有负泊松比(n)的材料。这意味着，与拉伸时变薄的传统材料（具有正泊松比）不同，拉胀材料会变厚。可以利用这种不寻常的行为来构建可以以以前不可能的方式工作的结构。这项研究将侧重于进一步开发和利用具有拉胀几何形状的螺旋纤维束的特性。埃克塞特开发的束显示了从零应变到全应变的拉胀功能；其中拉胀效应的强度也远远优越。也可以使用传统的织物编织技术大量生产这些束。这些功能将使拉胀剂的独特性能能够在商业应用中得到利用——最初是在新一代智能防爆织物的开发中。炸弹防爆网帘的发明是为了减少与爆炸事件相关的危险。玻璃通常是建筑物最薄弱的部分，在低压下会破裂。大爆炸后，破碎范围可能会延伸数英里，而高速玻璃碎片是此类事件中造成伤害的主要原因。通常，爆炸中受伤的人数比死亡的人数多得多。通过为潜在目标提供窗户保护，可以显着减少撕裂伤。目前的防爆帘设计倾向于使用芳纶网。当爆炸发生时，窗帘会卷起并捕获大部分玻璃碎片。然而在实践中，网状织物经常被爆炸的力量撕裂。这是因为网丝必须做得很细，以防止窗帘遮挡光线。我们需要的是一种智能纺织品，它既可以让光线通过，又能够容纳爆炸中产生的巨大力量，并为飞行碎片提供屏障。该项目的目的是研究不同的拉胀织物和编织物如何响应爆炸波，以及这种行为可以在多大程度上减轻爆炸的影响。该研究的目的是最终设计、制造和测试几种预生产原型纺织品。拉胀纺织品有多种潜在用途。一种解决方案是在拉伸的开放式单元排列中部署半透明的智能拉胀织物，使窗帘能够随时使用。如果发生爆炸，窗帘编织物将被最初的冲击波触发塌陷，织物会收缩，从而形成更紧密的织物，从而对玻璃和其他飞行碎片形成有效的屏障。或者，可以利用这些纱线来制造层压纺织品，该纺织品通过在每层中打开一系列孔来响应爆炸前沿的出现。这些让冲击波从一层穿过到下一层，依次分散其携带的能量。这种纺织品不仅可以阻挡飞溅的碎片，还可以减少最初的爆炸冲击波的影响。可以改变基本设计中的不同参数以允许系统得到改进——这些参数包括纤维缠绕角度、纤维直径和所用材料的基本特性。研究中使用的方法将遵循分解为一系列工作包的项目工作计划，使用里程碑来集中活动和衡量进展。 Exeter and Auxetics Ltd将负责整个主体研究工作。 Heathcoats ltd 将参与织造测试和试验面料的生产，PSDB 将对候选纺织品进行最终的爆炸测试。

项目成果

The Development of an Auxetic Blast Curtain

拉胀防爆幕的发展

• 发表时间: 2006
• 作者: M Burns