Abstract
A material extrusion (ME)-type 3D printed article has limited strength and durability because a thermoplastic resin in the form of a filament is deposited through a nozzle and becomes a product. In this study, the tensile characteristics of ME-type 3D printed specimens were examined according to the tool path. The tensile strengths of thirteen specimens with various tool paths, including seven symmetrical tool paths and six asymmetric tool paths, were measured and discussed. In addition, the tensile strengths of bulk and weldline specimens molded by injection molding were compared with the 3D printed specimens. The specimens fabricated by 3D printing with tool paths of 15/-15 and 30/-30 had higher tensile strength than the bulk specimen, and the lowest tensile strength was found in the 3D printed specimen with a tool path of 90/-90. High tensile strengths were demonstrated in the 3D printed specimens when the specimens were fractured at the surface where the maximum shear stress occurred. This study verified that a higher tensile strength than that of the bulk specimen can be obtained by controlling the tool path in the 3D printed specimens.
| Original language | English |
|---|---|
| Pages (from-to) | 769-775 |
| Number of pages | 7 |
| Journal | Polymer (Korea) |
| Volume | 44 |
| Issue number | 6 |
| DOIs | |
| State | Published - Nov 2020 |
Keywords
- 3D printing
- Anisotropy
- Material extrusion-type 3D printing
- Tensile strength
- Tool path