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Anisotropy and deformation heterogeneity in additive manufactured carbon-reinforced PEEK
Vipin Gupta,N. I. Thiruselvam,D. M. Kulkarni,V. V. Chaudhari,S. Suraj 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.6
Carbon-reinforced polyether ether ketone (C-PEEK) is one of the highperformance thermoplastic polymers used in engineering applications. To manufacture C-PEEK parts, a material extrusion process called fused deposition modeling (FDM) is more preferred than other 3D printing technologies such as material jetting, sheet lamination, VAT photopolymerization, binder jetting, directed energy deposition (DED) and powder bed fusion (PBF) due to its low cost and high efficiency. In FDM, the angle between printing and loading directions, called raster angle, is a known cause of material anisotropy. However, less attention has been paid to bring out the effect of raster angle on local state of strain. We fill this gap using digital image correlation (DIC) and scanning electron microscopy (SEM). Standard specimens made using three different raster angles, namely, 0°, 45°, and 90°, were tested upto failure by fracture. 0° raster angle offers the highest strength, whereas 90° raster angle yields the least strength. All specimens fail by brittle fracture. Strain localization that evolves near interfaces between two beads or layers play the most vital role in the failure mechanism.