Abstract
AbstractThe creation of tools by additive manufacturing is becoming increasingly convenient for CFRP one-off and small batch production. Screw extrusion additive manufacturing of thermoplastic polymers has boosted the development of large format manufacturing solutions. Interlayer adhesion and anisotropic properties of a 3D printed part are indisputably key aspects of tool manufacturing process. In this study, thermal and mechanical properties of large format 40% carbon fiber reinforced polyamide 6 3D printed tools were determined. Moreover, the influence on part performance of two main printing parameters, deposition temperature and extruding pressure, was analyzed with respect to polymer melt rheology. The printed material revealed a highly anisotropic thermal and mechanical behavior associated with the alignment of the high carbon fiber content. The optimal process window was identified in terms of substrate deposition temperature. Along the print direction, no major impact on tensile and flexural mechanical properties was detected, while the injection molding values were exceeded by approximately 10%. The layer adhesion was estimated by measuring the stress at break on transversely Z-oriented specimens. Higher deposition temperatures and pressures, combined with lower viscosity, promote wetting and bond formation between layers, ultimately leading to more consistent performances. The best results in the transverse direction were achieved between 140 and 160 °C, reaching roughly a fifth of the longitudinal values. A significant drop in performance was detected below 120 °C, which was identified as the minimum process temperature. A post-process annealing heat treatment was also investigated, no beneficial outcomes were reported.
Funder
Università degli Studi di Trento
Publisher
Springer Science and Business Media LLC
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference65 articles.
1. Additive Manufacturing—General Principles—Fundamentals and Vocabulary, 52900-21, ISO/ASTM (2022). https://doi.org/10.1520/f3177-21
2. M. Attaran, The Rise of 3-D Printing: The Advantages of Additive Manufacturing Over Traditional Manufacturing, Bus. Horiz., 2017, 60(5), p 677–688. https://doi.org/10.1016/j.bushor.2017.05.011
3. Technical Specifications—CMS Kreator, CMS S.p.A. http://scmgroup.com/it/cmsadvancedmaterials/products/. Accessed 5 July 2022
4. Technical Specifications—AM Flexbot, CEAD B.V. http://ceadgroup.com/solutions/robot-based-solutions/. Accessed 5 July 2022
5. Technical Specifications—LSAM, Thermwood Corporation. http://thermwood.com/lsam_home.htm. Accessed 5 July 2022
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