工艺优化与晶格结构设计是影响3D打印材料性能的关键因素。通过研究层厚度、打印速度以及打印方向对碳纤维增强尼龙66力学性能的影响规律,优化其3D打印工艺,最后确定最佳的打印工艺条件为同心圆打印方向,层高0.1mm,打印速度70mm/s,获得的碳纤维增强尼龙66的拉伸强度为121.969MPa,弯曲强度191.603MPa。对类蜂窝晶格、加筋蜂窝晶格、异化蜂窝晶格的压缩强度进行了有限元模拟分析,结果显示异化蜂窝晶格的压缩强度最佳,类蜂窝晶格次之,加筋蜂窝晶格最差。最后通过压缩实验对3种晶格结构进行分析,结果显示其压缩强度与有限元分析结果一致,异化蜂窝晶格结构的压缩性能最佳,其压缩强度为111.37MPa,比压缩强度为7.05MPa/g。可为碳纤维增强尼龙66材料的3D打印应用提供设计参考。
Process optimization and lattice structure design are the key factors affecting the properties of 3D-printed materials.In this paper,we optimized the 3D printing process of carbon fiber reinforced nylon 66 by studying the effects of layer thickness,printing speed and printing direction on its mechanical properties,and finally the optimal printing process conditions were determined to be a concentric circle printing direction,a layer height of 0.1mm,and a printing speed of 70mm/s.The tensile strength of carbon fiber reinforced nylon 6c obtained was 121.969MPa,and the flexural strength was 191.603MPa,and elastic modulus was 10810.52MPa.191.603MPa.Finite element simulation analysis of the compression strength of honeycomb-like lattice,reinforced honeycomb lattice,and dissimilated honeycomb lattice was carried out,and the results revealed that the dissimilated honeycomb lattice had the best compression strength,followed by honeycomb-like lattice,and the reinforced honeycomb lattice was the worst.Finally,the three lattice structures were analyzed by compression experiments,and the results indicated that their compression strengths were consistent with the finite element analysis results,and the compression performance of the heterogeneous honeycomb lattice structure was the best,with a compression strength of 111.37MPa and a specific compression strength of 7.05MPa/g.This provides design references for the 3D printing applications of the carbon fiber-reinforced nylon 66 materials.
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