3D打印连续芳纶纤维增强聚乳酸复合材料的拉伸性能研究

Tensile Properties of 3D Printed Continuous Kevlar Fiber Reinforced PLA Composites

将连续芳纶纤维(Kevlar)和聚乳酸(PLA)分别用作增强体和基体,同时引入熔融沉积成型(FDM)打印工艺制备样品,研究了打印层高、线宽、温度对连续芳纶纤维复合材料拉伸性能的影响。结果表明,随着打印层高与线宽的减小,试样中纤维含量逐渐增加,试样的拉伸强度显著增大。同时随着打印温度的增加,基体与纤维束结合加强,在一定范围内试样强度呈现上升趋势。当打印层高为0.3 mm,纤维体积分数为4.1%,试样的拉伸强度可达127 MPa,较纯PLA试样拉伸性能提高124.6%;较传统的纯PLA材料3D打印试样,连续芳纶纤维的加入极大地提高了试样的拉伸性能。

In this paper,continuous Kevlar fiber and polylactic acid( PLA) were used as reinforcement and matrix, and samples were prepared by fused deposition modeling( FDM) three dimensional( 3D) printing process.The effects of printing layer height,extrusion width and temperature on the tensile properties of Kevlar/PLA composites were analyzed.The experimental results show that as the layer height and extrusion width decrease,the fiber content in the sample increases,and the tensile strength of the samples increases remarkably.As the temperature increases,the matrix and the fiber bundle combine to strengthen,and the strength of the samples shows an upward trend within a certain range.When the printing layer height is 0.3 mm and the fiber volume content is 4.1%, the tensile strength of the samples could reach 127 MPa,which is 124.6% higher than pure PLA samples.Comparing with the traditional pure PLA,the addition of continuous Kevlar fiber greatly improves the tensile properties of the specimens.