期刊
POLYMERS
卷 14, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/polym14173586
关键词
Additive Manufacturing; fatigue; finite element method; bending stress
资金
- Universidad Industrial de Santander [2827]
Fatigue bending tests were performed on a polymer matrix composite material reinforced with continuous Kevlar fibers under controlled displacement. Static characterization and numerical modeling were used to analyze the material properties and fatigue behavior. Morphological analysis of the fractured surface revealed different failure mechanisms.
Fatigue bending tests, under controlled displacement, were performed on a polymer matrix composite material reinforced with continuous Kevlar fibers. The samples were fabricated using the Fused Filament Fabrication (FFF) technique in a Markforged Two (R) 3D printer. The static characterization delivered a flexural modulus of elasticity of 4.73 GPa and flexural strength of 110 MPa. The applied loading corresponded to 92.3, 88.5, 86.2, and 84.7% of the static flexural displacement, giving 15, 248, 460, and 711 cycles for failure. Additionally, two numerical models were created: one using orthotropic properties for static loading conditions; and a second one using isotropic in-bulk properties for fatigue modeling. The second model was able to reproduce the experimental fatigue results. Finally, morphological analysis of the fractured surface revealed fiber breakage, fiber tearing, fiber buckling, matrix cracking, and matrix porosity.
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