Natural fibre-reinforced composites have attracted a great deal of attention by the automotive industry mainly due to their sustainable characteristics and low cost. The use of sustainable composites is expected to continuously increase in this area as the cost and weight of vehicles could be partially reduced by replacing glass fibre composites and aluminium with natural fibre composites. Adhesive bonding is the preferred joining method for composites and is increasingly used in the automotive industry. However, the literature on natural fibre reinforced polymer composite adhesive joints is scarce and needs further investigation. The main objective of this study was to investigate experimentally adhesively bonded joints made of natural, synthetic and interlaminar hybrid fibre-reinforced polymer composites. The effect of the number of the interlaminar synthetic layers required in order to match the bonded joint efficiency of a fully synthetic GFRP bonded joint was studied. It was found that the failure load of the hybrid jute/glass adherend joints increased by increasing the number of external synthetic layers (i.e. the failure load of hybrid 3-layer joint increased by 28.6% compared to hybrid 2-layer joint) and reached the pure synthetic adherends joints efficiency due to the optimum compromise between the adherend material property (i.e. stiffness and strength) and a diminished bondline peel stress state.

中文翻译：

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黄麻，玻璃和黄麻/玻璃纤维混合增强聚合物复合材料的粘合接头，用于汽车行业

天然纤维增强复合材料因其可持续性和低成本而备受汽车行业的关注。由于可以通过用天然纤维复合材料代替玻璃纤维复合材料和铝，从而部分降低车辆的成本和重量，因此可持续复合材料的使用有望在这一领域不断增加。粘合剂粘结是复合材料的首选连接方法，并且在汽车工业中越来越多地使用。然而，关于天然纤维增强聚合物复合粘合剂接头的文献很少，需要进一步研究。这项研究的主要目的是研究由天然，合成和层间杂化纤维增强聚合物复合材料制成的粘合接头。研究了与完全合成的GFRP粘结接头的粘结接头效率相匹配所需的层间合成层数的影响。研究发现，通过增加外部合成层的数量，黄麻/玻璃复合材料混合接头的失效载荷增加（即，混合3层接头的失效载荷比混合2层接头的失效载荷增加了28.6％）并达到了由于在被粘物的材料特性（即刚度和强度）与减小的粘结层剥离应力状态之间存在最佳折衷，因此纯合成被粘物的接头效率很高。