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

该提案旨在研究防弹冲击过程中发生在防护织物组件中的损伤机制，并使用所获得的结果来改善防弹衣的防护。当高速射弹撞击多层防弹织物的组件时，对层的作用和来自层的反应随着组件内的位置而显著变化。因此，织物层应根据出现的应力和应变分布进行离散设计和工程化。本研究的主题是识别装甲在受到冲击时，各层组件中应变分布的差异。将通过高速摄影、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。然后，将设计和生产具有新型结构的芳纶织物，并控制织物中的纱线/纤维夹持，以匹配所发现的应变分布模式。这项工作将建立在我们正在进行的MOD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。具有不同性能的织物的分层将被优化，以最大限度地防止弹道冲击。由新型织物制成的防弹衣将根据NIJ和HOSDB标准进行测试，并与现有的防弹衣进行比较。在这个为期4年的项目完成后，我们预计将提高对弹道损伤机制的理解，并将制作出使用工程新型织物的新型防弹衣原型。

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.