Abstract
The use of continuous fiber as reinforcement in polymer additive manufacturing technologies enhances the mechanical performance of the manufactured parts. This is the case of the Carbon-Fiber reinforced PolyAmide (CF/PA) used by the MarkForged MarkTwo® 3D printer. However, the information available on the mechanical properties of this material is limited and with large variability. In this work, the in-plane mechanical properties and the interlaminar fracture toughness in modes I and II of Markforged’s CF/PA are experimentally investigated. Two different standard specimens and end-tabs are considered for the in-plane properties. Monolithic CF/PA specimens without any additional reinforcement are used for the interlaminar fracture toughness characterization. Two different mode I specimen configurations are compared, and two different test types are considered for mode II. The results show that prismatic specimens with paper end-tabs are more appropriate for the characterization of the in-plane material properties. The use of thick specimens for mode I fracture toughness tests complicates the characterization and can lead to erroneous results. Contrary to what has been reported in the literature for the same material, fracture toughness in mode I is lower than for mode II, which agrees with the normal tendency of traditional composite materials.
Highlights
The superior properties of fiber composites are well known, especially their high strength-to-weight and stiffness-to-weight ratios, and are used in different industries such as aeronautics and aerospace, F-1 cars, sport accessories, and ship construction.traditional manufacturing processes for composites require qualified operators and/or expensive equipment for developing time-consuming manufacturing operations, resulting in high costs
The material considered in this study is the 3D-printed composite material obtained with the Markforged MarkTwo® (Watertown, MA, USA) filament combining continuous carbon fiber with PolyAmide, Carbon-Fiber reinforced PolyAmide (CF/PA)
Is worth noting that in‐plane and in‐planefracture shear results only take into account the ItCF/PA
Summary
The superior properties of fiber composites are well known, especially their high strength-to-weight and stiffness-to-weight ratios, and are used in different industries such as aeronautics and aerospace, F-1 cars, sport accessories, and ship construction.traditional manufacturing processes for composites require qualified operators and/or expensive equipment for developing time-consuming manufacturing operations, resulting in high costs. The superior properties of fiber composites are well known, especially their high strength-to-weight and stiffness-to-weight ratios, and are used in different industries such as aeronautics and aerospace, F-1 cars, sport accessories, and ship construction. The fabrication of parts with complex geometries is difficult. These manufacturing drawbacks can be mitigated by using composite 3D printing technology. 3D printing is becoming a potentially attractive manufacturing technique in industrial applications due to design flexibility, reduced assembly time, low volume production, low amount of waste material, improved recyclability, etc. Potential applications for the 3D printing technology include the aerospace industry, architectural industries for structural models, printing tissues, organs and art [1,2,3,4,5]
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