Inhaltszusammenfassung

3D printing is still advancing rapidly in academic and industrial research. Fused deposition modelling (FDM) is an additive manufacturing technology that uses filaments as input material. The filaments are arranged adjacent to and above each other. The bonding strength of the contact between these filaments determines the mechanical properties of FDM products. These parts have the lowest dimensional accuracy and resolution of any 3D printing technology. Despite its many uses, FDM rapid p...3D printing is still advancing rapidly in academic and industrial research. Fused deposition modelling (FDM) is an additive manufacturing technology that uses filaments as input material. The filaments are arranged adjacent to and above each other. The bonding strength of the contact between these filaments determines the mechanical properties of FDM products. These parts have the lowest dimensional accuracy and resolution of any 3D printing technology. Despite its many uses, FDM rapid prototyping is ineffective for manufacturing structural parts due to anisotropic mechanical properties. The consolidation of layers in additive manufacturing procedures does not need pressure, in contrast to traditional polymer processing techniques. This study investigates the effect of high ambient pressure on the consolidation of layers during the FDM process and their characterization of mechanical properties. To attain high strength qualities for 3D printed items as similar to injection-moulded specimens, an experimental setup was built up using a 3D printer incorporated into a customized Autoclave. A maximum temperature of 185 °C and 135 bar of pressure may both be maintained in the autoclave. Atmospheres of compressed air at 0 bar, 5 bar, 10 bar, 15 bar, and 20 bar as well as nitrogen at 5 bar were used for PLA 3D printing in the autoclave. The effects of pressure and temperature on 3D- printed samples were examined, and tensile, flexural, and Charpy tests were performed on printed specimens as well as on specimens that had been injection moulded. It could be demonstrated that autoclave preheating before to printing and autoclave pressure during printing greatly enhance layer consolidation. Increased yield strength, Young's modulus, and impact strength are produced as a result of closer contact between the layer surfaces caused by the pressure within the autoclave. Most experiments produced better results when the autoclave pressure was 15 bar.» weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
4.31 - Werkstofftechnik

DDC Sachgruppe:
Ingenieurwissenschaften