Improvement in interfacial shear strength and fracture toughness for carbon fiber reinforced epoxy composite by fiber sizing

Liu, Wenbo; Zhang, Shu; Li, Bichen; Fan, Yang; Hao, Lifeng; Wang, Rongguo

doi:10.1002/pc.22685

Cited by 44 publications

(19 citation statements)

References 34 publications

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“…* * Estimated considering a weak carbon-fibre/polypropylene bonding. † Calculated from values found in literature [37,38,[46][47][48][49][50]. ‡ Calculated from the size and volume fraction of the specimens tested experimentally [37,38]).…”

Section: Matrix Propertiesmentioning

confidence: 99%

Semi-analytical simulation of aligned discontinuous composites

Henry

Pimenta

2017

Composites Science and Technology

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Aligned-discontinuous-fibre reinforced polymers have the potential to combine (i) the high specific stiffness and strength and light weight of conventional continuous-fibre composites with (ii) increased damage tolerance, improved manufacturability, and the ability to close the life-cycle loop of composites by using recycled fibres. However, predicting the mechanical response of discontinuous composites is a challenge for which no universally accepted and computationally-efficient solution exists yet. This paper presents a model for aligned discontinuous-fibre reinforced composites considering (i) a generic constitutive law for the matrix, (ii) stochastic fibre failure under non-uniform stress fields due to the presence of fibreends, and (iii) unstable final failure from a critical cluster of damage. Results show good agreement with experiments from the literature, and the model also stresses the importance of considering the stochastic nature of both the fibre-end locations and the fibre-strengths to model aligned discontinuous composites.Parametric studies suggest that failure of aligned discontinuous composites depends on (i) the overlap length between fibres for short-fibre composites, and (ii) the fibre strength for long-fibre composites; intermediate-length fibres would result in discontinuous composites with maximum stiffness, strength, and failure strain simultaneously.

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Section: Matrix Propertiesmentioning

confidence: 99%

Semi-analytical simulation of aligned discontinuous composites

Henry

Pimenta

2017

Composites Science and Technology

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“…Tensile tests on single fiber indicated that PAEK coating eliminated the surface defects and improved the interfacial toughness. This has been proved by analyzing the force-displacement curves monitored in microbond tests [14].…”

Section: Inorganic Fibersmentioning

confidence: 99%

Recent advances in fiber/matrix interphase engineering for polymer composites

Karger‐Kocsis

Mahmood

Pegoretti

2015

Progress in Materials Science

501

251

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This review summarizes the recent (from year 2000) advancements in the interphase tailoring of fiber-reinforced polymer composites. The scientific and technological achievements are classified on the basis of the selected strategies distinguishing between i) interphase tailoring via sizing/coating on fibers, ii) creation of hierarchical fibers by nanostructures, iii) fiber surface modifications by polymer deposition and iv) potential effects of matrix modifications on the interphase formation. Special attention was paid to report on efforts dedicated to the creation on (multi)functional interphase in polymer composites. This review is round up by listing current trends in the characterization and modelling of the interphase. In the final outlook, future opportunities and challenges in the engineering of fiber/matrix interphase are summarized.

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“…The treatment of the fibers with H 2 SO 4 introduced sulfonic acid groups on the surface of the fibers; this enhanced the reactivity of the fiber surface. Moreover, the greater the volume ratio of H 2 SO 4 in the mixed acids was, the higher the O/C ratio was …”

Section: Resultsmentioning

confidence: 99%

Modification of dry‐spun Suplon polyimide fibers by mixed‐acid oxidation and their effects on the properties of polypropylene‐resin‐based composites

Chen

Long

Zhang

et al. 2017

J of Applied Polymer Sci

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In this study, the effects of mixed-acid oxidation on the contents of surface elements, morphology, fiber fineness, mechanical properties, mass change rate, chemical structure, and microaggregate structure of dry-spun Suplon polyimide (PI) fibers were systematically investigated with wet chemical treatment with HNO 3 /H 2 SO 4 . Experiments investigating both the improvement in the O/C ratio of the fiber surface elements and the changes in other performance features were conducted through the functional modification of the fibers. Meanwhile, the causes of specific changes in the mechanical properties of the oxidized PI-fiber-reinforced polypropylene-resin-based composites were studied and are discussed. The results of this study demonstrate that the treatment of the fibers with HNO 3 /H 2 SO 4 mixed-acid oxidation resulted in significant changes in the properties of the fibers; these changes included an uneven surface, increased specific surface area and surface roughness, a locally etched surface, increased surface energy and O/C ratio, an enhanced wettability, an increased fiber fineness, reduced mechanical properties, and a mass gain in the fibers. Although the chemical structures of the fibers treated by oxidized HNO 3 /H 2 SO 4 were not significantly changed compared to those of the untreated fibers, the microscopic aggregation of the treated fibers changed to some degree, and the ratio of the amorphous regions significantly increased. Taken together, the functional modification of the PI fiber surface was achieved efficiently through the use of a suitable HNO 3 /H 2 SO 4 oxidation process and with other performance features of the fibers taken into account. This was favorable for the enhancement of the interfacial properties of the polypropylene fibers and the matrix resins, and thus, the modification improved the mechanical properties of the composites.

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Improvement in interfacial shear strength and fracture toughness for carbon fiber reinforced epoxy composite by fiber sizing

Cited by 44 publications

References 34 publications

Semi-analytical simulation of aligned discontinuous composites

Semi-analytical simulation of aligned discontinuous composites

Recent advances in fiber/matrix interphase engineering for polymer composites

Modification of dry‐spun Suplon polyimide fibers by mixed‐acid oxidation and their effects on the properties of polypropylene‐resin‐based composites

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