The effect of filling structure on the impact resistance of fused deposition 3D printed structures

Abstract

The impact resistance of the 3D-printed sandwich structure is significantly affected by its internal filling structure. In this study, 3D-printed sandwich structures with different filling structures are designed and prepared. By carrying out low-speed impact experiments under the same impact energy and different impactors, the influence of the filling structure on the impact resistance of the 3D-printed sandwich structure is explored. Research shows that line-filled structures can only absorb approximately 30 % − 50 % of the energy of the impactor, and their average bearing capacity is only about 20 % of that of other configurations, making them unsuitable for filling in anti-impact protection structures. In contrast, the bearing capacity of surface-filled structures has an average improvement of about 40 % compared with volume-filled structures, exhibiting better anti-impact performance. Among them, the honeycomb filling structure has a relatively high peak load, and the overall damage depth of the specimen is relatively small, demonstrating more excellent anti-impact performance. This research provides a reference for the application of 3D-printed sandwich structures and the design of internal core structures.