High Strain Rate Damage Mechanisms in 2D/3D Ballistic Fabrics

本提案旨在研究防护织物组件在弹道冲击过程中发生的损伤机制，并利用所获得的结果来提高防弹防弹衣的防护能力。当高速弹丸击中多层弹道织物的装配体时，对各层的作用和各层的反应在装配体内的位置有显著差异。因此，织物层应根据发生的应力和应变分布进行离散设计和工程。本研究的主题是识别当装甲受到冲击时，装配的每一层应变分布的差异。通过高速摄影、拉曼光谱和计算机模拟等手段进行研究，为应变分布提供科学依据。具有新结构的芳纶织物将被设计和生产，织物中的纱线/纤维夹持控制与所发现的应变分布模式相匹配。这项工作将建立在我们正在进行的国防部资助的创意竞赛项目中获得的这种新型织物的成功基础上。不同性能的织物分层将被优化，以最大限度地防止弹道冲击。由新型面料制成的防弹衣将根据NIJ和HOSDB标准进行测试，并将与现有版本的防弹衣进行比较。在这个为期4年的项目完成后，我们设想对弹道损伤机制的理解将得到加强，并且使用工程新型织物的新版本防弹衣将被制成原型。

This proposal aims to investigate the damage mechanisms that occur during ballistic impact in protective fabric assemblies and use the results obtained to improve the protection of ballistic body armours. When a high-velocity projectile strikes an assembly of many layers of ballistic fabric, the action on the layers and the reaction from the layers vary significantly with position within the assembly. The fabric layers should therefore be designed and engineered discretely according to the stress and strain distributions that occur. This research's theme is the recognition of the differences in the strain distribution in each and every layer of the assembly when the armour is impacted. Studies will be carried out, by means of high-speed photography, Raman spectroscopy and computer simulation to provide scientific evidence on the strain distribution. Aramid fabrics with novel structures will be then engineered and produced with controlled yarn/fibre gripping in the fabrics to match the pattern of strain distributions found. This work will build upon our success on such novel fabrics gained during our on-going MOD funded Competition of Ideas project. Layering of fabrics with different properties will be the optimised for maximum protection against ballistic impact. Body armours made from the novel fabrics will be tested against the NIJ and HOSDB standards and will be compared to the existing versions of body armours. At the completion of this 4-year project, we envisage that the understanding of ballistic damage mechanisms will be enhanced and that a new version of body armour using the engineered novel fabrics will be prototyped.