Abstract
To further improve the mechanical properties of thermoplastic resin in additive manufacturing (AM), this paper presents a novel method to directly and quantitatively place the short fibers (SFs) between two printing process of resin layers. The printed composite parts with SFs between the layers was reinforced. The effects of single-layer fiber content, multi-layer fiber content and the length of fibers on the mechanical properties of printed specimens were studied. The distribution of fibers and quality of interlayer bonding were assessed using mechanical property testing and microstructure examination. The results showed that the tensile strength of the single-layered specimen with 0.5 wt% interlayered SFs increased by 18.82%. However, when the content of SFs continued to increase, the mechanical properties declined because of the increasing interlayered gap and the poor bonding quality. In addition, when the interlayered SFs length was 0.5–1 mm, the best reinforcement was obtained. To improve the interfacial bonding quality between the fiber and the resin, post-treatment and laser-assisted preheating printing was used. This method is effective for the enhancement of the interfacial bonding to obtain better mechanical properties. The research proves that adding SFs by placement can reduce the wear and breakage of the fibers compared to the conventional forming process. Therefore, the precise control of the length and content of SFs was realized in the specimen. In summary, SFs placement combined with post-treatment and laser-assisted preheating is a new method in AM to improve the performance of thermoplastic resin.
Highlights
Thermoplastic resin has the advantages of high humidity resistance, high corrosion resistance and good forming performance. [1,2,3]
specimens. fibers (SFs) placement combined with post-treatment and laser-assisted preheating is a new method in additive manufacturing (AM) to improve the performance of thermoplastic resin
Adding SFs to the thermoplastic resin filament can improve the mechanical properties of the printed specimens
Summary
Thermoplastic resin has the advantages of high humidity resistance, high corrosion resistance and good forming performance. [1,2,3]. Many researchers have attempted to use various methods to improve the mechanical properties of printed parts. The fibers bear the pressure of the specimen, and this changes the optical, acoustic, thermal and impact resistance of the forming parts [4,5,6]. Experiments have found that the fiber orientation in the fiber-forming direction is as high as 91.5% [4]. The fiber characteristics such as the length, content and printing parameters affect the mechanical properties of the forming specimen [7]. By optimizing the printing parameters, the interfacial bonding quality, the impregnation degree of the fiber and resin, Materials 2020, 13, 2868; doi:10.3390/ma13122868 www.mdpi.com/journal/materials
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