Natural fibre composites have been trending in the industries recently due to their better recyclability, renewability, biodegradability. Fused Deposition Modelling (FDM) is one of the widely used additive manufacturing process for the fabrication of simple and complex structures. In this study, hemp/PLA 3D printed honeycomb sandwich structures were fabricated by FDM process and mechanical behaviour was characterized. Initially, the tensile behaviour of hemp fibre/PLA filaments and the 3D printed composite specimens with an infill angle of 0°/90°, -45°/ + 45° were investigated. Honeycomb cores were fabricated and their mechanical behaviour in flatwise, edgewise directions were analysed. Later, honeycomb sandwich structures were fabricated using core and skin parts. Compression and 4-Point bending tests were performed to characterize the mechanical behaviour. Analytical analysis was also performed to predict the mechanical properties of the honeycomb sandwich structure knowing the properties of the cell wall material. Some small-scaled automotive and aerospace prototypes were fabricated to assure the application of this methodology.

天然纤维复合材料由于其更好的可回收性，可再生性，可生物降解性，最近在行业中已成为趋势。熔融沉积建模（FDM）是用于制造简单和复杂结构的一种广泛使用的增材制造工艺。在这项研究中，大麻/ PLA 3D打印的蜂窝状三明治结构通过FDM工艺制造，并表征了机械性能。最初，研究了大麻纤维/ PLA长丝和填充角度分别为0°/ 90°，-45°/ + 45°的3D打印复合材料样品的拉伸性能。制造了蜂窝状芯，并分析了它们在平面，边缘方向上的机械性能。后来，蜂窝夹层结构是用芯和表皮零件制造的。进行压缩和四点弯曲测试以表征机械性能。还进行了分析分析，以了解蜂窝壁材料的特性来预测蜂窝夹层结构的机械特性。为了保证这种方法的应用，制造了一些小型的汽车和航空原型。