Pertuz-Comas Alberto David, Díaz Jorge G, Meneses-Duran Oscar Javier, Niño-Álvarez Nixon Yesid, León-Becerra Juan
GIC, Escuela de Ingeniería Mecánica, Universidad Industrial de Santander, Carrera 27 Calle 9, Bucaramanga 680002, Colombia.
GIEMA, Escuela de Ingeniería Mecánica, Universidad Industrial de Santander, Carrera 27 Calle 9, Bucaramanga 680002, Colombia.
Polymers (Basel). 2022 Aug 30;14(17):3586. doi: 10.3390/polym14173586.
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 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.
在控制位移的情况下，对连续凯夫拉纤维增强的聚合物基复合材料进行了疲劳弯曲试验。样品是在Markforged Two 3D打印机中使用熔丝制造（FFF）技术制造的。静态表征给出了4.73 GPa的弯曲弹性模量和110 MPa的弯曲强度。施加的载荷相当于静态弯曲位移的92.3%、88.5%、86.2%和84.7%，分别导致15、248、460和711次循环失效。此外，创建了两个数值模型：一个在静态加载条件下使用正交各向异性属性；另一个在疲劳建模中使用体各向同性属性。第二个模型能够再现实验疲劳结果。最后，对断裂表面的形态分析揭示了纤维断裂、纤维撕裂、纤维屈曲、基体开裂和基体孔隙率。
