ABSTRACT

The application of a sandwich structure made with composite facesheet and honeycomb core has increased rapidly due to high stiffness to weight ratio characteristics. There is a growing interest in using natural/synthetic hybrid composite to enhance the mechanical performance of natural fiber and reduce the environmental impact compared to synthetic materials. This study investigates the mechanical properties (tensile, edgewise compression, flexural) of the honeycomb sandwich structure with the hybrid composite facesheet, reinforced with different kenaf and glass fiber ratios. Non-hybrid kenaf and glass fiber composites were fabricated for comparison. The result showed that increasing the glass fiber ratio in a hybrid facesheet significantly improved the mechanical performance of the sandwich structure. Compared to the non-hybrid kenaf composite, the hybrid composite showed improved tensile and compression strength by up to 233% and 79%, respectively. The hybrid composite (glass/kenaf/glass) achieved 76% tensile modulus and 87% compression strength of glass fiber composite when the results were normalized. The specific flexural stiffness of the hybrid facesheet using glass fiber in the outer layer exhibited comparable performance by obtaining 89% flexural stiffness of non-hybrid glass composite sandwich structure.

摘要

由于具有高的刚度重量比特性，由复合面板和蜂窝状芯制成的三明治结构的应用迅速增加。与合成材料相比，使用天然/合成杂化复合材料来增强天然纤维的机械性能并减少环境影响的兴趣与日俱增。这项研究调查了混合复合面板的蜂窝夹芯结构的力学性能（拉伸，边缘压缩，弯曲），并用不同的洋麻和玻璃纤维比率进行了增强。制备非混合的洋麻和玻璃纤维复合材料进行比较。结果表明，增加混合面板中的玻璃纤维比率可显着改善夹层结构的机械性能。与非杂交洋麻复合材料相比，杂化复合材料的拉伸强度和压缩强度分别提高了233％和79％。当将结果标准化时，该杂化复合材料（玻璃/洋麻/玻璃）达到了玻璃纤维复合材料的76％拉伸模量和87％压缩强度。通过获得非混合玻璃复合夹层结构的89％的弯曲刚度，在外层使用玻璃纤维的混合面板的比弯曲刚度表现出可比的性能。