Abstract:

In order to solve the problem of low strength in 3D printing resin-based materials, fibers were used to reinforce resin-based materials. Glass fibers and polylactic acid were blended and rapidly formed by using 3D printing technology. The injluences of filling density and slice thickness on the mechanical properties of the composites were studied. The results of mechanical experiments show that the flexural strength and tensile strength of the samples can reach 49.26 MPa and 21.28 MPa, respectively, when the filling density of the samples is 90%. When the slice thickness of the sample was 0.1mm, the obtained tensile strength and flexural strength were 20.4 MPa and 52.87 MPa, respectively. By the analysis of the results of mechanical experiments, the tensile strength of the samloes decreases as the slice thickness increases, and increasing as the filling density increases. The flexural strength of the specimen is negatively correlated with the slice thickness, and is positively correlated with the filling density. By analyzing scanning electron microscopy images of cross sections of different kinds of samples, the degree of fiber bundle infiltration resin matrix is closely related to the slice thickness and filling density of the sample, and the increase in filling density and the reduction in slice thickness facilitate the bonding of the fiber bundle with the resin matrix.

Key words: glass fiber, 3 D printing, flexural property, polylactic acid