Impacts of cell type and strut thickness on bending fatigue lifetime of additive-manufactured PLA-wood parts
This study examined the fatigue characteristics of samples fabricated by material extrusion via Fused Deposition Modeling (FDM) 3D printer, focusing on the impact of cell type and strut thickness on fatigue lifetime. The study examined various cell types known for their superior bending performance,...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425019787 |
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| Summary: | This study examined the fatigue characteristics of samples fabricated by material extrusion via Fused Deposition Modeling (FDM) 3D printer, focusing on the impact of cell type and strut thickness on fatigue lifetime. The study examined various cell types known for their superior bending performance, including square and hexagonal cross-sections. It expanded to include cylindrical and spherical cells to broaden the understanding of fatigue behavior in cellular structures. The finite element modeling analysis was conducted to simulate the maximum bending stress in the cellular samples. This was crucial due to the distinct second moments of the area between cellular and solid samples. Then, rotary bending fatigue experiments were carried out on the mentioned cell types, determining the effect of cell type on fatigue performance. Afterward, the impact of strut thickness was investigated on the best cell type for fatigue endurance, considering different values of strut thickness varying from 1 to 1.4 mm. The results revealed that cylinder cellular geometries with increased strut thickness exhibited enhanced fatigue resistance, attributed to reduced stress concentration. Moreover, the fracture surface examination highlighted the less brittle nature of PLA wood compared to pure PLA, with fibrillation and micro-void formation being critical indicators of the response of the material to cyclic stress. |
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| ISSN: | 2238-7854 |