ArticlePolymers2026
Effects of Node Fillet Radius on Compressive Properties and Energy Absorption of FDM-Fabricated PETG Auxetic Honeycombs.
Article in Polymers, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Node fillet radius has a pronounced effect on the compressive performance of fused deposition modeling (FDM)-printed polymer honeycombs, yet quantitative design guidelines for PETG auxetic structures remain scarce. The effects of gradient node fillet radii (R0-R7 mm) on the load-bearing capacity, deformation mechanisms and energy absorption of PETG auxetic honeycombs were investigated by quasi-static compression tests. Results reveal a dual competing mechanism: stress homogenization improves crushing stability, whereas nodal cross-section weakening reduces structural stiffness. Among the six configurations, R5 (35.7% radius-to-cell ratio) achieved the best balanced performance, with a peak strength of 0.35 MPa and specific energy absorption of 335.25 J/kg, and crushed progressively without catastrophic load drops. At R3 mm, nodal weakening raised the working stress and caused premature brittle fracture; at R7 mm, excessive filleting lowered peak strength to 0.30 MPa, slightly below the unfilleted control. Although unfilleted R0 showed the highest total energy absorption, specific energy absorption (342.62 J/kg) and efficiency (46.97%), its right-angle nodes induced disordered brittle collapse that compromises service safety. The resulting Pareto trade-off shows that moderate filleting best balances strength and energy absorption, providing parameter guidance for the topology optimization of 3D-printed polymer lightweight protective components.
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