Impact of fiber length and fiber content on the mechanical properties and electrical conductivity of short carbon fiber reinforced polypropylene composites

Unterweger, Christoph; Mayrhofer, Tina; Piana, Francesco; Duchoslav, Jiri; Stifter, David; Poitzsch, Claudia; Fürst, Christian

doi:10.1016/j.compscitech.2020.107998

Cited by 49 publications

(37 citation statements)

References 36 publications

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“…PCF has undergone a substantial reduction in length distribution compared to MLF due to their initial differences in fiber length and distribution. Furthermore, the critical length of carbon fiber is important for mechanical reinforcement and is known to be in the range of 500–600 μm 10,35–37 . The fiber length distribution analysis indicates PCF has retained around 3–6% of fibers above the critical length, whereas for the MLF it was about 1–2%.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the critical length of carbon fiber is important for mechanical reinforcement and is known to be in the range of 500-600 μm. 10,[35][36][37] The fiber length distribution analysis indicates PCF has retained around 3-6% of fibers above the critical length, whereas for the MLF it was about 1-2%. This difference in observed fibers length, along with weighted average in fiber length is expected to reflect in the morphology as well as the final mechanical properties of the printed parts.…”

Section: Fiber Length Distributionmentioning

confidence: 99%

“…7,8 Subsequently, short fibers reinforced PP possesses a great opportunity for demanding applications. Authors, such as Fu and Lauke, 9 and Unterweger et al, 10 have analytically studied the effect of processing on the fiber length and subsequent influence on mechanical strength of short fiber-reinforced polymers and demonstrated a significant increase of the composite strength with the increase of the weighted average fiber length. Extruded PP and carbon fibers (CFs) composites studied by Kuriger et al, 11 which were based on vapor-grown CFs, displayed a partial alignment of CFs, resulting in anisotropic properties (mechanical, thermal conductivity and electrical resistivity).…”

Section: Introductionmentioning

confidence: 99%

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Impact of processing conditions and sizing on the thermomechanical and morphological properties of polypropylene/carbon fiber composites fabricated by material extrusion additive manufacturing

Savandaiah

Maurer

Gall

et al. 2020

J of Applied Polymer Sci

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For the 3D printed composites, fiber alignment is affected by the direction of melt‐flow during extrusion of filaments and subsequently through the printing nozzle. The resulting fibers orientation and the fiber‐matrix compatibility have a direct correlation with mechanical properties. This study investigates the impact of processing conditions on the state of the carbon fiber types and their orientation on the mechanical properties of 3D‐printed composites. Short and long carbon fibers were used as starting reinforcing materials, and the state of fibers at the beginning and on the printed parts were evaluated. Strong anisotropy in terms of mechanical properties (flexural and impact properties) was observed for the samples printed with different printing orientations. Interestingly, the number of voids in the printed composites was found to be correlated with the fiber types. The present work provides a step towards the optimization of tailored composite properties by additive manufacturing.

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Section: Resultsmentioning

confidence: 99%

Section: Fiber Length Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of processing conditions and sizing on the thermomechanical and morphological properties of polypropylene/carbon fiber composites fabricated by material extrusion additive manufacturing

Savandaiah

Maurer

Gall

et al. 2020

J of Applied Polymer Sci

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show abstract

“…Similar observations have been reported by Rezaei et al [101], who studied the effect of fiber length on the thermomechanical properties of SCF-reinforced PP composites. Similarly, Unterweger et al [102] evaluated the effect of fiber length distributions and content on SCF-reinforced PP polymer's mechanical properties. They concluded that tensile strength, tensile modulus, and impact strength were improved upon the increasing amount of SCF despite reducing fiber length, tensile strength, tensile modulus, and impact strength.…”

Section: Mechanical Strength and Modulus Of Cfrtpmentioning

confidence: 99%

Comprehensive Review of the Properties and Modifications of Carbon Fiber-Reinforced Thermoplastic Composites

et al. 2021

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Carbon fiber-reinforced polymers are considered a promising composite for many industrial applications including in the automation, renewable energy, and aerospace industries. They exhibit exceptional properties such as a high strength-to-weight ratio and high wear resistance and stiffness, which give them an advantage over other conventional materials such as metals. Various polymers can be used as matrices such as thermosetting, thermoplastic, and elastomers polymers. This comprehensive review focuses on carbon fiber-reinforced thermoplastic polymers due to the advantages of thermoplastic compared to thermosetting and elastomer polymers. These advantages include recyclability, ease of processability, flexibility, and shorter production time. The related properties such as strength, modulus, thermal conductivity, and stability, as well as electrical conductivity, are discussed in depth. Additionally, the modification techniques of the surface of carbon fiber, including the chemical and physical methods, are thoroughly explored. Overall, this review represents and summarizes the future prospective and research developments carried out on carbon fiber-reinforced thermoplastic polymers.

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“…When the CF is not added and the length of the CF is 4 mm and 8 mm, the average strength of the concrete composite material is 7.87 MPa, 12.15 MPa, and 15.35 MPa, respectively. Christoph Unterweger et al [ 24 ] compounded 10 vol% CF materials with polypropylene materials. The tensile strength and tensile modulus of composite materials rise with the increase of fiber length.…”

Section: Introductionmentioning

confidence: 99%

Carbon Fiber Reinforced Multi-Phase Epoxy Syntactic Foam (CFR-Epoxy-Hardener/HGMS/Aerogel-R-Hollow Epoxy Macrosphere(AR-HEMS))

Jiang

Wang

et al. 2021

Polymers

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Because the aerogel has ultra-low density and good impact resistance, the aerogel material, epoxy-hardener system, and expandable polystyrene beads (EPS) were used to prepare the lightweight aerogel reinforced hollow epoxy macro-spheres (AR-HEMS). The multi-phase epoxy syntactic foam (ESF) was manufactured with the epoxy-hardener system, HGMS (EP-hardener-HGMS), and AR-HEMS by “the compression modeling method.” In this experiment, in order to enhance the strength of the ESF, some different kinds of the carbon fiber (CF) were added into the EP-hardener-HGMS system (CFR-EP). The influence of the volume stacking fraction, inner diameter, and layer of the AR-HEMS and the content and type of the CF in the EP-HGMS (CFR-EP) system on the compressive strength of the ESF were studied. Weighing the two factors of the density and compressive strength, the ESF reinforced by 1.5 wt% CF with 90% AR-HEMS has the better performance. This kind of the ESF has 0.428 g/cm3 nd 20.76 Mpa, which could be applied in 2076 m deep sea.

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Impact of fiber length and fiber content on the mechanical properties and electrical conductivity of short carbon fiber reinforced polypropylene composites

Cited by 49 publications

References 36 publications

Impact of processing conditions and sizing on the thermomechanical and morphological properties of polypropylene/carbon fiber composites fabricated by material extrusion additive manufacturing

Impact of processing conditions and sizing on the thermomechanical and morphological properties of polypropylene/carbon fiber composites fabricated by material extrusion additive manufacturing

Comprehensive Review of the Properties and Modifications of Carbon Fiber-Reinforced Thermoplastic Composites

Carbon Fiber Reinforced Multi-Phase Epoxy Syntactic Foam (CFR-Epoxy-Hardener/HGMS/Aerogel-R-Hollow Epoxy Macrosphere(AR-HEMS))

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