挤出3D打印PLA/CF复合材料的力学性能

选用碳纤维质量分数为5%的增强聚乳酸(PLA/CF)复合材料及纯聚乳酸(PLA)为原料,采用挤出式3D打印方法、以不同层厚和喷嘴直径制备PLA/CF复合材料试件及纯PLA试件,对试件进行拉伸、弯曲、压缩等力学性能测试,采用扫描电子显微镜分析试件微观结构,研究CF及层厚和喷嘴直径工艺参数对复合材料力学性能的影响。结果表明,随着层厚的降低、喷嘴直径的增大,试件力学性能提升;层厚0.1mm、喷嘴直径0.6mm时,PLA/CF复合材料的力学性能达到最佳,拉伸强度为23.7MPa,弯曲强度为53.9MPa,压缩强度为109.1MPa;与纯PLA试件相比,PLA/CF复合材料的拉伸强度增加了50%,弯曲强度增加了100%,压缩强度降低了10%。

Mechanical Properties of Carbon Fiber Reinforced Polylactic Acid Composites Based on 3D Extrusion Printing

Using polylactic acid (PLA)/carbon fiber (CF) composites with 5% mass fraction CF and pure PLA as materials, PLA/CF composite specimens and pure PLA specimens were prepared by extrusion 3D printing method with different thickness and nozzle diameter. The tensile,bending,compression and other mechanical properties of the specimens were tested. The microstructure of the specimens was analyzed by scanning electron microscopy,and the effects of CF,thickness and nozzle diameter on the mechanical properties of the composites were studied. The experimental results show that the mechanical properties of PLA /CF composites are improved with the decrease of layer thickness and the increase of nozzle diameter. When the layer thickness is 0.1 mm and the nozzle diameter is 0.6 mm,the mechanical properties of PLA/CF composites are the best,the tensile strength is 23.7 MPa,the flexural strength is 53.9 MPa,and the compressive strength is 109.1 MPa. Compared with PLA/CF composites, the tensile strength and flexural strength of PLA/CF composites increase by 50%,100% respectively,while the compressive strength decreases 10%.