ABSTRACT

New concepts of honeycomb structures were developed. These new cellular structures, known as honeycomb (HN), reentrant honeycomb (RE-HN) and silicomb (Silico) are made from new solid polymer matrix reinforced with natural fibers resulting in biocomposites that are innovative and sustainable for a variety of engineering applications. In order to elaborate these biocomposites structures, PLA (Polylactic Acid) molds were made using a 3D printer. Then, the flexural behavior of honeycomb, reentrant and silicomb structures reinforced by various natural fibers like flax, jute and sisal using various fibers volume fractions of 10, 20 and 30% was investigated. Taguchi plan (L₉) experiments were conducted to determine how each factor affects bending stress, displacement and flexural modulus. Bending stress values varied from 24.66 to 36.53 MPa while flexural modulus values from 3.58 to 17.17 GPa. Moreover, it was found that fiber volume fraction had significant influence on flexural properties and on fracture resistance.

The silicomb structure has a higher load capacity than the honeycomb and reentrant structures. In fact, this type of biocomposite structure with low density and good mechanical properties are intended for many packaging and furnishing applications with a lower impact on the environment.

摘要

开发了蜂窝结构的新概念。这些被称为蜂窝 (HN)、折返蜂窝 (RE-HN) 和硅 (Silico) 的新型蜂窝结构由用天然纤维增强的新型固体聚合物基体制成，从而形成具有创新性和可持续性的生物复合材料，适用于各种工程应用。为了精心制作这些生物复合材料结构，使用 3D 打印机制作了 PLA（聚乳酸）模具。然后，研究了使用 10%、20% 和 30% 的各种纤维体积分数的各种天然纤维（如亚麻、黄麻和剑麻）增强的蜂窝、凹入和硅结构的弯曲行为。田口计划（L ₉) 进行了实验以确定每个因素如何影响弯曲应力、位移和弯曲模量。弯曲应力值从 24.66 到 36.53 MPa 不等，而弯曲模量值从 3.58 到 17.17 GPa。此外，发现纤维体积分数对弯曲性能和抗断裂性有显着影响。

硅蜂窝结构比蜂窝结构和凹进结构具有更高的承载能力。事实上，这种具有低密度和良好机械性能的生物复合结构适用于许多对环境影响较小的包装和家具应用。