Abstract
Material extrusion-based 3D-printed structures generally exhibit low mechanical strength and poor resistance to external impact. In this study, a bioinspired Bouligand structure—known for its excellent fracture resistance in nature— was mimicked to enhance the impact strength of 3D-printed specimens. The effect of the staggered angle of the deposition path on dynamic impact behavior was investigated using specimens fabricated with twisting angles of 9°, 18°, 36°, 45°, and 90°. For comparison, injection-molded specimens were also prepared. The impact behavior was analyzed in terms of the maximum load and absorbed energy obtained from drop-weight impact tests. Results showed that smaller staggered angles led to higher maximum impact loads, and the specimen with an 18° angle exhibited the most complex crack propagation pattern and the highest energy absorption. In certain staggered angles, the absorbed energy of the 3D-printed specimens exceeded that of the injection-molded ones. These findings demonstrate that an appropriately designed staggered angle in Bouligand-type bioinspired structures can significantly improve the impact resistance of 3D-printed materials.
| Translated title of the contribution | Dynamic Impact Behavior of Bioinspired Structures Fabricated by Material Extrusion-based 3D Printing |
|---|---|
| Original language | Korean |
| Pages (from-to) | 323-330 |
| Number of pages | 8 |
| Journal | Polymer (Korea) |
| Volume | 50 |
| Issue number | 2 |
| DOIs | |
| State | Published - Mar 2026 |
Keywords
- bioinspired structure
- bouligand architecture
- dynamic impact behavior
- material extrusion-based 3D printing
- staggered angle
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