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Experimental and Theoretical Analysis of the Mechanical Performance of 3D-Printed Biomedical Splints Made of PLA/CF with Structural Geometric Variations

Authors :

ELNAZ ABEDINI¹ Nima Feizlou²

1- دانشگاه کارابوک ترکیه 2- دانشگاه بورسا تکنیک

Keywords :

biomedical splint،PLA/CF،mechanical performance

Abstract :

Polylactide (PLA) reinforced with 15% carbon fiber (PLA/CF15%) is a biodegradable material suitable for 3D-printed biomedical applications via fused deposition modeling (FDM). This study evaluates the mechanical performance of PLA/CF15% cylindrical splints (outer diameter 100 mm, inner diameter 84 mm) in solid and perforated designs (108 holes, 10 mm diameter). Axial compression (ASTM D695) and radial drop-weight impact tests (6.5 kg, 1.5 m) assessed ultimate strength, Young’s modulus, and absorbed energy (n=5 per design). The solid specimen exhibited an ultimate compressive force of 4,903 ± 150 N (1.11 ± 0.03 MPa) and Young’s modulus of 1.84 ± 0.10 GPa, while the perforated specimen showed 2,941 ± 100 N (1.00 ± 0.03 MPa) and 1.20 ± 0.08 GPa. Impact energy absorption was 94 ± 5 J (solid) and 61 ± 4 J (perforated). Discrepancies with theoretical predictions (45 MPa, 5.25 GPa, 95.6 J) were due to FDM defects like porosity and stress concentrations. Both designs exceeded orthopedic splint force requirements (1,000–1,500 N with safety factor) [3]. The perforated design offers weight reduction (~33%) and ventilation, enhancing patient comfort. Further validation against clinical standards is needed.

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