This work presents the experimental determination of fracture mechanics parameters of composite specimens manufactured by fused filament fabrication (FFF) with continuous carbon fiber reinforced thermoplastic filaments, based on Linear Elastic Fracture Mechanics (LEFM). The critical mode I translaminar fracture toughness (K_Ic) and the critical energy release rate (G_Ic) are found for unidirectional and cross-ply laminates. The specimens were submitted to quasi-static tensile testing. Digital Image Correlation (DIC) is used to find the stress field. The stress fields around the crack tip are compared to linear elastic finite element simulations. The results demonstrate the magnitude of fracture toughness is in the same range as for polymers and some metals, depending on lay-up configuration. Besides, fractographic analyses show some typical features as river lines, fiber impression, fiber pulls-out and porosity aspects.

这项工作提出了基于线性弹性断裂力学 (LEFM) 的由熔融长丝制造 (FFF) 和连续碳纤维增强热塑性长丝制造的复合材料试样的断裂力学参数的实验确定。临界模式 I 跨层断裂韧性 (K _Ic ) 和临界能量释放率 (G _Ic) 用于单向和交叉层层压板。试样进行准静态拉伸试验。数字图像相关 (DIC) 用于找到应力场。裂纹尖端周围的应力场与线弹性有限元模拟进行了比较。结果表明，断裂韧性的大小与聚合物和某些金属的范围相同，具体取决于叠层配置。此外，断口分析显示了一些典型特征，如河流线、纤维压痕、纤维拉出和孔隙度方面。