Abstract
Three-dimensional (3D) printing continuous carbon fiber-reinforced polylactic acid (PLA) composites offer excellent tensile mechanical properties. The present study aimed to research the effect of process parameters on the tensile mechanical properties of 3D printing composite specimens through a series of mechanical experiments. The main printing parameters, including layer height, extrusion width, printing temperature, and printing speed are changed to manufacture specimens based on the modified fused filament fabrication 3D printer, and the tensile mechanical properties of 3D printing continuous carbon fiber-reinforced PLA composites are presented. By comparing the outcomes of experiments, the results show that relative fiber content has a significant impact on mechanical properties and the ratio of carbon fibers in composites is influenced by layer height and extrusion width. The tensile mechanical properties of continuous carbon fiber-reinforced composites gradually decrease with an increase of layer height and extrusion width. In addition, printing temperature and speed also affect the fiber matrix interface, i.e., tensile mechanical properties increase as the printing temperature rises, while the tensile mechanical properties decrease when the printing speed increases. Furthermore, the strengthening mechanism on the tensile mechanical properties is that external loads subjected to the components can be transferred to the carbon fibers through the fiber-matrix interface. Additionally, SEM images suggest that the main weakness of continuous carbon fiber-reinforced 3D printing composites exists in the fiber-matrix interface, and the main failure is the pull-out of the fiber caused by the interface destruction.
Highlights
Three-dimensional (3D) printing is a new manufacturing process, which uses a three-dimensional model (CAD model) to create a desired object by adding materials in layers
In study order to the influence of parameters on the mechanical properties of continuous fiber-reinforced printing parts, we considered that related research on the influence of printing carbon fiber-reinforced 3D printing parts, we considered that related research on the influence of directiondirection on the quality printing had parts matured, that there certain coupling relationship printing on theofquality ofparts printing had and matured, andwas thatathere was a certain coupling between extrusion width and printing pitch, i.e. thepitch, variation range of the range printing pitch is verypitch small relationship between extrusion width and printing i.e. the variation of the printing width constant
The tensile mechanical properties of continuous carbon fiber-reinforced 3D printing composites is affected by various process parameters
Summary
Three-dimensional (3D) printing (additive manufacturing) is a new manufacturing process, which uses a three-dimensional model (CAD model) to create a desired object by adding materials in layers. Many studies have improved the mechanical properties of 3D printing parts by adding reinforcing materials such as fibers or particles. This method has been widely used in processes for enhancing the strength of conventional composites by forming fiber-reinforced polymers (FRP) [6]. The experimental results showed that carbon fiber could significantly improve the mechanical properties of composites. The experimental results showed that the tensile strength and stiffness of the composites were significantly improved under the reinforcement of a high content of fibers. The volume average method was used to predict the elastic parameters of fiber-reinforced 3D printing samples, with good prediction results for samples with high fiber content.
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