Carbon Fiber Reinforced Epoxy Vitrimer: Robust Mechanical Performance and Facile Hydrothermal Decomposition in Pure Water

Abstract Additive manufacturing (AM) is a novel technology which allows fabrication of complex geometries from digital representations without tooling. In addition, this technology results in low material waste, short lead times and cost reduction especially for the production of parts in low quantities. Current additive manufacturing processes developed for thermoplastic sandwich panels suffer from an unavoidable weak mechanical performance and low thermal resistance. To overcome these limitations, emphasis is paid in this study on direct write AM technology for the fabrication of short carbon fiber-reinforced sandwich panel composites. Sandwich panels using different infill densities with high strength (> 107 MPa), and high short carbon fiber volume (46%) were attained successfully. In parallel to the strength enhancement, these sandwich panels possessed reduced densities (0.72 g/cc3) due to their lightweight lattice core structures. The mechanical performance of the created sandwich panels was examined and compared to the unreinforced, base ink structures by performing compression tests. Successful fabrication and characterization of the additively manufactured thermoset-based carbon fiber reinforced, sandwich panels in this study can extend the range of applications for AM composites that require lightweight structures, high mechanical performance as well as the desired component complexity.

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The Mechanical Performance of the 3D Printed Composites Produced with Continuous Carbon Fiber Reinforced Filaments Obtained via Melt Impregnation

Additive Manufacturing ◽

10.1016/j.addma.2021.102112 ◽

2021 ◽

pp. 102112

Author(s):

Altuğ Uşun ◽

Recep Gümrük

Keyword(s):

Carbon Fiber ◽

Mechanical Performance ◽

Fiber Reinforced ◽

Melt Impregnation ◽

Continuous Carbon Fiber ◽

3D Printed ◽

Carbon Fiber Reinforced

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Effects of Hydrothermal Aging of Carbon Fiber Reinforced Polycarbonate Composites on Mechanical Performance and Sand Erosion Resistance

Polymers ◽

10.3390/polym12112453 ◽

2020 ◽

Vol 12 (11) ◽

pp. 2453

Author(s):

Mei Fang ◽

Na Zhang ◽

Ming Huang ◽

Bo Lu ◽

Khalid Lamnawar ◽

...

Keyword(s):

Carbon Fiber ◽

Erosion Resistance ◽

Mechanical Performance ◽

Sampling Period ◽

Hot Water ◽

Fiber Reinforced ◽

Hydrothermal Aging ◽

Humid Environment ◽

Sand Erosion ◽

Carbon Fiber Reinforced

Carbon fiber reinforced polycarbonate (CF/PC) composites have attracted attention for their excellent performances. However, their performances are greatly affected by environmental factors. In this work, the composites were exposed to hydrothermal aging to investigate the effects of a hot and humid environment. The mechanical properties of CF/PC composites with different aging times (0, 7, 14, 21, 28, 35, and 42 days) were analyzed. It was demonstrated that the storage modulus of CF/PC composites with hot water aged for seven days has the highest value in this sampling period and frequency. Through the solid particle erosion experiment, it was found that the hydrothermal aging causes the deviation of the maximum erosion angle of composites, indicating the composites underwent ductile–brittle transformation. Furthermore, the crack and cavity resulting from the absorption of water was observed via the scanning electron microscope (SEM). This suggested that the hydrothermal aging leads to the plasticization and degradation of CF/PC composites, resulting in a reduction of corrosion resistance.

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Trial Fabrication of Carbon Fiber-Reinforced Thermoplastic Honeycomb Sandwich Materials

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.774.25 ◽

2018 ◽

Vol 774 ◽

pp. 25-30

Author(s):

Hitoshi Takagi ◽

Kenya Nishimura ◽

Antonio N. Nakagaito

Keyword(s):

Carbon Fiber ◽

Mechanical Performance ◽

Sandwich Panels ◽

Fiber Reinforced ◽

Honeycomb Core ◽

Honeycomb Sandwich ◽

Carbon Fiber Reinforced ◽

Honeycomb Cores ◽

Flexural Tests ◽

Sandwich Materials

This paper deals with a new fabrication technique of carbon fiber-reinforced thermoplastic (CFRTP) honeycomb cores and all-CFRTP honeycomb sandwich panels. The CFRTP core was made of plane woven carbon fiber-reinforced polypropylene prepreg sheets. The stacked CFRTP prepreg sheets were periodically hot-pressed at the node locations, and then expanded to form an all-CFRP honeycomb core. The resultant CFRTP honeycomb cores were glued with the same polypropylene-based plain-woven CFRTP skin plates. The mechanical performance of the all-CFRTP honeycomb sandwich panels was evaluated by flexural tests. The experimental results showed the effectiveness of proposed all-CFRTP sandwich panels.

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