Liu Yiding, Carnegie Craig, Ascroft Helen, Li Wenhao, Han Xiao, Guo Hua, Hughes Darren J
Warwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, UK.
Centre of Excellence for Aeronautics, School of Aerospace, Transport and Manufacturing, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK.
Materials (Basel). 2021 Nov 18;14(22):6991. doi: 10.3390/ma14226991.
To meet the high demand for lightweight energy-efficient and safe structures for transport applications, a current state-of-the-art light rail vehicle structure is under development that adopts a multi-material design strategy. This strategy creates the need for advanced multi-material joining technologies. The compatibility of the adhesive with a wide range of material types and the possibility of joining multi-material structures is also a key advantage to its success. In this paper, the feasibility of using either epoxy or polyurethane adhesive joining techniques applied to the multi-material vehicle structure is investigated. Importantly, consideration is given to the effect of variation in bond thickness for both families of structural adhesives. Multi-material adhesively bonded single lap joints with different adhesives of controlled bond thicknesses were manufactured and tested in order to experimentally assess the shear strength and stiffness. The torsional stiffness and natural frequency of the vehicle were modelled using a global two-dimensional finite element model (FEM) with different adhesive properties, and the obtained vehicle performances were further explained by the coupon-level experimental tests. The results showed that the vehicle using polyurethane adhesive with a target bond thickness of 1.0 mm allowed for optimal modal frequency and weight reduction.
为满足运输应用中对轻质、节能且安全结构的高需求，目前正在研发一种采用多材料设计策略的先进轻轨车辆结构。这种策略催生了对先进多材料连接技术的需求。胶粘剂与多种材料类型的兼容性以及连接多材料结构的可能性也是其成功的关键优势。本文研究了将环氧或聚氨酯胶粘剂连接技术应用于多材料车辆结构的可行性。重要的是，考虑了两种结构胶粘剂粘结厚度变化的影响。制造并测试了具有不同控制粘结厚度的不同胶粘剂的多材料粘结单搭接接头，以通过实验评估其剪切强度和刚度。使用具有不同胶粘剂特性的全局二维有限元模型（FEM）对车辆的扭转刚度和固有频率进行建模，并通过试样级实验测试进一步解释所获得的车辆性能。结果表明，使用目标粘结厚度为1.0毫米的聚氨酯胶粘剂的车辆具有最佳模态频率和重量减轻效果。
