Effects of infill pattern, infill ratio and print orientation on the mechanical and vibration response of PLA structures
Journal of the Brazilian Society of Mechanical Sciences and Engineering, cilt.48, sa.10, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 48 Sayı: 10
- Basım Tarihi: 2026
- Doi Numarası: 10.1007/s40430-026-06646-6
- Dergi Adı: Journal of the Brazilian Society of Mechanical Sciences and Engineering
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Compendex, INSPEC, Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
- Anahtar Kelimeler: Additive manufacturing, FFF, Mechanical properties, Modal analysis, PLA
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Eskişehir Osmangazi Üniversitesi Adresli: Evet
Özet
This study examined the combined effects of infill pattern, infill ratio, and pattern orientation on the tensile and vibration behavior of PLA structures produced by fused filament fabrication (FFF). Despite extensive studies on individual FFF parameters, the combined tensile and vibration behavior of honeycomb, tetrahedral, and Hilbert curve infills has not yet been systematically evaluated under a common structural parameter set. To address this gap, PLA specimens were manufactured using a Taguchi L9 design and evaluated by tensile testing and impact-based modal analysis. Pattern orientation governed the tensile response, accounting for about 60% of the variation in elastic modulus, 75% in tensile strength, and 67% in elongation. The highest elastic modulus was obtained in H45 (945.1 MPa), while T45 showed the highest tensile strength (40.3 MPa) and elongation (5.5%). In contrast, infill pattern was the main factor governing vibration behavior, accounting for about 59% of the stiffness variation and 80% of the damping ratio variation. Specifically, the Hilbert curve pattern showed the highest stiffness, while the tetrahedral pattern showed the highest damping ratio. Natural frequency was governed primarily by pattern orientation, which accounted for about 45% of the variation, while infill pattern had a secondary effect, contributing about 35%. HC45 exhibited the highest stiffness (450,000 N/m), T15 the highest damping ratio (0.128%), and T45 the highest natural frequency (195 Hz). These findings showed that mechanical strength and vibration response were controlled by different properties of internal architecture, providing a practical route for tailoring lightweight FFF components for engineering applications.