抄録
To widen the application of 3D printed continuous carbon fiber-reinforced thermoplastics (CFRTPs), understating of both their open hole mechanical properties and fracture mechanisms is of a pressing need. In this study, tensile tests were performed on 3D printed CFRTP plates with open holes and a quasi-3D extended finite element method (XFEM) program was used to compare the experimental results with the numerical analysis. The specimens were formed using a commercially available 3D printer followed by drilling of the hole. The laminate structure of the printed specimens was [0/90]2s. An X-ray computed tomography (CT) observation of the fabricated specimens showed no delamination was introduced by the drilling process, even though in-plane and interlayer voids due to filament undulation were observed. Experimentally obtained Young’s modulus and OHT strength were 35.6 ± 1.2 GPa and 185.0 ± 2.7 MPa, respectively. The XFEM accurately predicts both Young’s modulus and OHT strength and their values are 36.1 GPa and 191.0 MPa, respectively. The printed specimens failed to leave brittle fracture due to fiber break at the hole edge, which can be also simulated by the XFEM used in this study.
