Development of lightweight composite helmet using auxetic materials

使用拉胀材料开发轻质复合头盔

• 批准号: 2442948
• 金额: --
• 依托单位: Queen's University Belfast
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2442948
• 关键词: Development; lightweight; composite; helmet; using

The use of military helmets has greatly reduced injuries and saved lives of many soldiers. A helmet's protective capabilities are evaluated on the basis of two primary test measures: resistance to penetration (RTP) and back face deformation (BFD). Many factors are considered during ballistic helmet design, including comfort, weight, fit, and maintainability. Especially, being light in weight for military helmets is very important due to long-term operations. The ubiquitous use of lightweight composite materials in protective structures has created a formidable challenge in ensuring the same level of protectiveness as their metallic counterpart. Different approaches toward the development of more efficient materials have led to an interest in auxetic structures. Auxetic refers to a negative Poisson's ratio which is a meta-material property. Consequently, when a compressive load is applied to an auxetic, the material will contract in the direction orthogonal to the applied load, creating a denser region. This densification makes auxetics suited to severe loading conditions such as impact. This research programme will examine their effectiveness in the design of lightweight composite helmets.In order to decrease design cycle times and ensure that safe design standards are met, virtual tests are usually performed by numerical simulation. The virtual impact test data are subsequently used as part of the development of a new design. These numerical simulations produce results without building a physical model, and can be performed relatively quickly and inexpensively. This permits optimization of the design before an actual prototype of the helmet has to be built.The aim of this project is to develop an optimum composite helmet using auxetic core structure, to deliver the lightest possible military helmet with improved ballistic efficiency. A new finite element model will be developed to analyse the impact response of composite sandwich panels using auxetic cores. The effect of helmet shell material, shell thickness, impact velocities, and impact types (with hemispherical and flat anvils) on the performance will also be studied. "

军用头盔的使用大大减少了受伤，挽救了许多士兵的生命。头盔的防护能力是根据两个主要的测试指标来评估的：抗穿透性（RTP）和背面变形（BFD）。在防弹头盔的设计过程中，需要考虑许多因素，包括舒适性、重量、贴合性和可维护性。特别是，由于长期操作，军用头盔的重量轻是非常重要的。轻质复合材料在防护结构中的普遍使用，在确保与金属对应物相同的防护水平方面带来了巨大的挑战。开发更有效材料的不同方法已经引起了对拉胀结构的兴趣。负泊松比是指负泊松比，这是一种超材料性质。因此，当向拉胀材料施加压缩载荷时，材料将在与所施加的载荷正交的方向上收缩，从而产生更致密的区域。这种致密化使得拉胀学适合于恶劣的负载条件，如冲击。为了缩短设计周期和确保达到安全设计标准，通常采用数值模拟的方法进行虚拟测试。虚拟冲击试验数据随后被用作新设计开发的一部分。这些数值模拟无需建立物理模型即可产生结果，并且可以相对快速和廉价地执行。该项目的目的是开发一种使用拉胀芯结构的最佳复合材料头盔，以提供尽可能轻的军用头盔，并提高弹道效率。建立了一种新的有限元模型，用于分析含拉胀芯的复合材料夹层板的冲击响应。还将研究头盔外壳材料、外壳厚度、冲击速度和冲击类型（半球形和扁平砧）对性能的影响。"