Investigation of Compression Strength Enhancement in 3D-Printed Hollow Structures Using Granular Backfill
摘要
The recent state of technology shows that the advantages of Direct Polymer Additive Tooling (DPAT) in sheet metal forming operations, e.g. low production cost and time, lose significance with increasing size of the formed part since it is strongly dependent on the limited flow of material on a 3D printer. This study presents the results of a feasibility study regarding the potential of material reduction in DPAT. For that, a preliminary parameter study for the specimen geometry was carried out. Based on the findings, the four most promising parameter sets were selected for compression tests. The results demonstrate the efficacy of compressed granular material in backfilling structures with low filling density, thereby enhancing the load-bearing capacity of hollow printed parts. It is shown that the presented material reduction strategy has the potential to bring back the advantages of DPAT for components with larger dimensions. In accordance with the principles of circular economy and sustainable production, the approach focuses exclusively on the use of biodegradable polymer materials combined with natural and reusable backfill materials.