Effect of process parameters on the mechanical properties of fiber‐reinforced thermoplastics fabricated by direct fiber feeding injection molding

Zhang, Yajun; Wu, Mingqiu; Zheng, S.; Xie, Yumeng; Jin, Zhiming

doi:10.1002/pen.26388

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…When comparing particle-dispersed and fiber-dispersed composites, it has been found that the latter display greater mechanical anisotropy. As the aspect ratio increases, these composites develop mechanical anisotropy comparable to that of continuous fibers [26][27][28]. This correlation is believed to be applicable to blends of PP and PS polymers.…”

Section: Relation Of Morphology and Mechanical Anisotropy Of Injectio...mentioning

confidence: 81%

Mechanical Anisotropy of Injection-Molded PP/PS Polymer Blends and Correlation with Morphology

Takayama,

Shibazaki

2023

Polymers

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The molecular orientation formed by melt-forming processes depends strongly on the flow direction. Quantifying this anisotropy, which is more pronounced in polymer blends, is important for assessing the mechanical properties of thermoplastic molded products. For injection-molded polymer blends, this study used short-beam shear testing to evaluate the mechanical anisotropy as a stress concentration factor, and clarified the correlation between the evaluation results and the phase structure. Furthermore, because only shear yielding occurs with short-beam shear testing, the yielding conditions related to uniaxial tensile loading were identified by comparing the results with those of three-point bending tests. For continuous-phase PP, the phase structure formed a sea-island structure. The yield condition under uniaxial tensile loading was interface debonding. For continuous-phase PS, the phase structure was dispersed and elongated in the flow direction. The addition of styrene–ethylene–butadiene–styrene (SEBS) altered this structure. The yielding condition under uniaxial tensile loading was shear yielding. The aspect ratio of the dispersed phase was found to correlate with the stress concentration factor. When the PP forming the sea-island structure was of continuous phase, the log-complex law was sufficient to explain the shear yield initiation stress without consideration of the interfacial interaction stress.

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Section: Relation Of Morphology and Mechanical Anisotropy Of Injectio...mentioning

confidence: 81%

Mechanical Anisotropy of Injection-Molded PP/PS Polymer Blends and Correlation with Morphology

Takayama,

Shibazaki

2023

Polymers

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Effect of recycled fibers and shredded intermediates variation on the mechanical properties and energy absorption of fiber‐reinforced composite panels

Vaidya,

Fono Tamo,

Chahine

et al. 2023

Polymer Composites

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The global composite industry generates large quantities of waste which mostly ends up in landfills due to a lack of established end‐use applications for multiple waste streams. The scrap from end‐of‐life (EoL) includes manufacturing waste such as dry chopped fiber tows, loose fibers, shredded fibers from fabric textile operations, cured/semi‐cured prepregs, and fully cured composite structure waste from aircraft, automobiles, wind blades, boats, and pressure vessels. In this work, different composite waste streams were reduced to shredded intermediates, followed by simple blending, and subjected to wet compression molding to produce composite panels. The panels/plaques were tested for mechanical properties (flexure and impact), fiber‐matrix wet‐out, and property bounds. It was found that wet‐compression molding was a viable and scale‐able approach to produce recycled panels from EoL composites shredded scrap. Furthermore, full‐scale size panels for use in truck bodies and intermodal shipping container flooring were manufactured and their impact resistance was tested using a drop weight impact test. They were tested both for high‐ and low‐velocity load. In the case of high‐velocity load, the average impact load was 14,673 N; the average absorbed energy was 101.6 J; the average elastic energy was 11.7 J and the impact resistance was 1065 J/m. In the case of the low‐velocity drop weight impact test, it was found that the average impact load was 7877.358 N; the average absorbed energy was 9.718 J; the average elastic energy was 9.14 J, and the impact resistance was 184.1 J/m. The shredded composite was shown to be a candidate material for the manufacture of truck bodies and intermodal containers’ flooring panels.Highlights By using shredded intermediates from different composite waste streams, it is possible to manufacture composite panels. Wet–compression process is an appropriate technique for manufacturing recycled fiber composite panels. Regardless of the source of scrap, the mechanical properties of the produced composite panels were improved. The recycling process technology can be transformed to commercial scale to produce full‐size transportation flooring panels. A product pathway is established in consideration of lower cost and improved recyclability.

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Effect of nozzle aperture on glass fiber reinforced polypropylene fabricated by DFFIM

Zhang,

Wu,

Zheng

et al. 2023

Journal of Reinforced Plastics and Composites

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Fiber length and interfacial bonding properties are important factors in determining the mechanical properties of the composites. As an emerging fiber-reinforced thermoplastic molding method, DFFIM can reduce the fiber breakage during the molding process and thus improve the mechanical properties, while the fiber length and interfacial bonding properties of the composites fabricated by DFFIM are mainly affected by the equipment structure. This paper takes nozzle as the research object to investigate the effect of nozzle on the properties of glass fiber reinforced polypropylene (GF/PP) fabricated by DFFIM. First, GF/PP composites at three positions of nozzle flange, nozzle air-injection outlet and mold cavity were selected for fiber length detection, and it was found that the nozzle would lead to more severe fiber breakage in GF/PP composites; POLYFLOW was subsequently used to analyze the shear stress of GF/PP mixed flow fields in different aperture nozzles; DFFIM experiments were carried out to analyze the fiber length, micromorphology, and mechanical properties of GF/PP composites using the nozzle aperture as the test factor, and the results were consistent with the simulation results, as the nozzle aperture increased, the fiber length and interfacial bonding properties of GF/PP composites gradually increased, hence improving the mechanical properties.

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Effect of process parameters on the mechanical properties of fiber‐reinforced thermoplastics fabricated by direct fiber feeding injection molding

Cited by 3 publications

References 17 publications

Mechanical Anisotropy of Injection-Molded PP/PS Polymer Blends and Correlation with Morphology

Mechanical Anisotropy of Injection-Molded PP/PS Polymer Blends and Correlation with Morphology

Effect of recycled fibers and shredded intermediates variation on the mechanical properties and energy absorption of fiber‐reinforced composite panels

Effect of nozzle aperture on glass fiber reinforced polypropylene fabricated by DFFIM

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