Abstract

Most energy absorbing structures in automotive applications consist of metals. Those are characterised by high absolute energy absorption (EA) values yet low mass-specific energy absorption (SEA_m). In contrast carbon fibre reinforced polymers (CFRP) reach higher SEA_m values. The difference however is not a direct consequence of the density, weight specific stiffness or strength. Instead, the failure progression and hence the energy dissipation characteristics of metallic and CFRP structures are different. Whether a combination of the two material types leads to an increase or decrease of the SEA depends on the crash characteristics of the laminate which supposedly depends on the lay-up. The present paper reports on an experimental investigation on the crash behaviour of omega-shaped fibre-metal laminates (FML) composed of unidirectional CFRP prepreg layers and steel-foils under compressive axial loads. A potential of the tested hybrid laminates is proven by an increase of the mass-specific energy absorption value (SEA_m) of 58%, compared to CFRP.

摘要

汽车应用中的大多数能量吸收结构由金属组成。其特点是绝对能量吸收 (EA) 值高但质量比能量吸收 (SEA _m ) 低。相比之下，碳纤维增强聚合物 (CFRP) 达到更高的 SEA _m价值观。然而，差异不是密度、重量比刚度或强度的直接结果。相反，金属结构和 CFRP 结构的失效进程以及因此的能量耗散特性是不同的。两种材料类型的组合是否会导致 SEA 的增加或减少取决于层压板的碰撞特性，而层压板的碰撞特性可能取决于叠层。本论文报告了由单向 CFRP 预浸料层和钢箔组成的欧米茄形纤维金属层压板 (FML) 在轴向压缩载荷下的碰撞行为的实验研究。与 CFRP 相比，质量比能量吸收值 (SEA _m ) 增加了 58%，证明了测试混合层压板的潜力。