Anisotropy and deformation heterogeneity in additive manufactured carbon-reinforced PEEK

• Published in: Journal of mechanical science and technology 2023, 37(6), , pp.2871-2880
• Main Authors: Gupta, Vipin, Thiruselvam, N. I., Kulkarni, D. M., Chaudhari, V. V., Suraj, S.
• Format: Article
• Language: English
• Subjects: Anisotropy; Carbon fiber reinforced plastics; Control; Deposition; Digital imaging; Dynamical Systems; Engineering; Failure mechanisms; Fused deposition modeling; Heterogeneity; Industrial and Production Engineering; Laminates; Mechanical Engineering; Original Article; Photopolymerization; Polyether ether ketones; Powder beds; Raster; Strain localization; Three dimensional printing; Vibration; 기계공학
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-023-0513-7

Carbon-reinforced polyether ether ketone (C-PEEK) is one of the high-performance 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 photo-polymerization, 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.