Adhesive bonding and mechanical fastening techniques are mostly applied for the joining of polymer composites. However, in recent times, the hybrid joining (bonded/bolted) technique is emerging, as it prevents premature failure of composite joints. An experimental investigation was carried out in this study to analyze the hybrid joining behavior of green composites (bamboo/poly(lactic acid) (PLA)) under tensile and compressive loadings. The hybrid joints were developed by combining bolted and bonded joints. The hole in the specimen prerequisite for the bolted joint was obtained by traditional drilling performed at a constant spindle speed of 2000 revolutions per min and an axial feed of 45 mm/min using a multifaceted solid carbide drill bit. A bolt fastening torque of 20 N m was applied to facilitate the mechanical joining. Three bonding materials – namely, (a) epoxy, (b) polyurethane and (c) parent polymer (PLA) – were used to obtain the bonded joint. The important factors of the hybrid joint, such as (a) overlapping length, (b) width of the specimen and (c) bonding material, were considered, and their effect on both tensile and compressive failure loads was evaluated. The significance of the parameters of the hybrid joint was evaluated through statistical modeling.

中文翻译：

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拉伸和压缩载荷下绿色复合材料的混合接头分析

粘合剂粘合和机械紧固技术主要用于聚合物复合材料的连接。然而，最近出现了混合连接（粘合/螺栓连接）技术，因为它可以防止复合材料接头过早失效。本研究进行了一项实验研究，以分析绿色复合材料（竹/聚乳酸（PLA））在拉伸和压缩载荷下的混合连接行为。混合接头是通过结合螺栓接头和粘合接头而开发的。螺栓连接的先决条件试样中的孔是通过使用多面整体硬质合金钻头以 2000 转/分钟的恒定主轴速度和 45 毫米/分钟的轴向进给率进行的传统钻孔获得的。施加 20 N·m 的螺栓紧固扭矩以促进机械连接。a ) 环氧树脂、( b ) 聚氨酯和 ( c ) 母体聚合物 (PLA)——用于获得粘合接头。考虑了混合接头的重要因素，例如 ( a ) 重叠长度、( b ) 试样宽度和 ( c ) 粘合材料，并评估了它们对拉伸和压缩破坏载荷的影响。通过统计建模评估混合关节参数的显着性。