Effects of Print Orientation on Mode-I Fracture Toughness of Additively Manufactured PLA: Simulation by XFEM B. Paygozar, R. M. Gorguluarslan Department of Mechanical Engineering, TOBB University of Economics and Technology, Ankara 06560, Turkey Keywords: Mode-I, Fracture Toughness, Print Orientation, XFEM. In this study, Mode-I fracture toughness of the PLA material was to be determined through threepoint bending fracture test so as to extract the critical value for the crack propagation. The raster angle utilized to fabricate the single edge notch bending (SENB) specimens with three repetitions was chosen as ±45°. Three different print orientations (P-Os) were utilized to investigate the effects of printing direction (i.e., horizontal, lateral, and vertical) on the fracture properties. Extraction of the fracture properties was conducted as per the standard ASTM D5045-14 on the specimens fabricated in different print orientations. The values of Mode-I fracture toughness of PLA were respectively obtained as 4.19, 4.15, and 3.73 MPa√mwith horizontal, lateral, and vertical print orientation. A commercial finite element package ABAQUS was utilized in order to employ the extracted values into extended finite element method (XFEM) and to investigate the crack propagation in the specimens. 105
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