ABSTRACT

The natural fiber-based polymeric composites are being used extensively in various engineering applications, especially in the non-structural parts and components. Although, a large number of primary processing techniques, such as hand-layup and compression molding are available for fabrication of parts, still the secondary processing in terms of joining and machining is inevitable. The joining of composite parts becomes necessary in case of complicated and intricate product designs. Adhesive joining is one of the most commonly used processes for polymer-based composite materials. It is a cheap, easy, and smooth bonding process and does not necessitate the drilling of holes for the purpose of mechanical fastening. In the present experimental investigation, the joint strength of woven fiber mat (sisal, jute, and hybrid) reinforced epoxy composites has been investigated using different joint configurations, namely, single lap, double-strap butt, and scarf joint. The effect of adhesives has also been explored by joining composites with two types of epoxy resins and corresponding hardener. It was observed that the hybrid composites recorded better joining performance for both types of adhesives. Moreover, the Field Emission Scanning Electron Microscopy (FE-SEM) has been used to understand the failure mechanisms during tensile testing of adhesively bonded natural fiber-reinforced composite laminates. The three-dimensional assembly models of adherend specimens were created using the SOLIDWORK V.16 modeling software. ANSYS-V.18.2 WORKBENCH was employed for the analysis of the joint performance. The maximum shear stress and the total deformation results were determined. The finite element analysis (FEA) results were compared with experimental findings and were found to be in good agreement.

摘要

基于天然纤维的聚合物复合材料被广泛用于各种工程应用，特别是在非结构零部件中。虽然有大量的初级加工技术，如手工铺叠和压缩成型可用于制造零件，但在连接和机械加工方面的二次加工仍然是不可避免的。在复杂和复杂的产品设计的情况下，复合部件的连接变得必要。胶粘连接是聚合物基复合材料最常用的工艺之一。这是一种廉价、简单且平滑的粘合工艺，不需要为了机械紧固而钻孔。在本实验研究中，编织纤维垫（剑麻、黄麻、和混合）增强环氧树脂复合材料已使用不同的接头配置进行了研究，即单搭接、双带对接和嵌接接头。通过使用两种环氧树脂和相应的硬化剂连接复合材料，也探索了粘合剂的效果。据观察，混合复合材料对两种类型的粘合剂都有更好的连接性能。此外，场发射扫描电子显微镜 (FE-SEM) 已被用于了解粘合天然纤维增强复合材料层压板拉伸测试过程中的失效机制。粘附试样的 3D 装配模型是使用 SOLIDWORK V.16 建模软件创建的。ANSYS-V.18.2 WORKBENCH 用于分析接头性能。确定了最大剪切应力和总变形结果。将有限元分析 (FEA) 结果与实验结果进行了比较，发现它们非常吻合。