Improvement of damage resistance in laminated composites with electrospun nano-interlayers

Sihn, Sangwook; Kim, Ran Y.; Huh, Wansoo; Lee, Kwang-Hoon; Roy, Ajit K.

doi:10.1016/j.compscitech.2007.09.015

Cited by 72 publications

(41 citation statements)

References 13 publications

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“…The flexural strength and modulus increase reported by the three-point bending tests characterized both delamination resistance and matrix toughening introduced by the addition of the interlayer. This double effect of the interlayer was also studied and introduced by Sihn et al [5].…”

Section: Flexural Performance By Three-point Bending Testsmentioning

confidence: 96%

“…Dzenis observed that entangled nanofibers improve interlaminar fracture resistance much like the hooks and loops in Velcro and also play a part in crack deflection, nanofiber pull-out, plastic deformation, and crack bridging [4]. This pioneering idea was then applied to several composite systems and studied under various testing conditions [5][6][7][8][9][10] which were thoroughly reviewed and discussed by Zucchelli et al [11].…”

Section: Introductionmentioning

confidence: 99%

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Structural composites hybridized with epoxy compatible polymer/MWCNT nanofibrous interlayers

Bilge

Özden-Yenigün

Şimşek

et al. 2012

Composites Science and Technology

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a b s t r a c tSurface reactive P(St-co-GMA) copolymer and P(St-co-GMA)/MWCNT fibrous mats are placed onto a conventional carbon fiber/epoxy prepreg as interlayer reinforcing material. Experimental observations are used to demonstrate excellent epoxy wetting and structural compatibility of the interlayers chemically tuned for the epoxy matrix. Comparisons of increase in mechanical performance by incorporating P(Stco-GMA) and P(St-co-GMA)/MWCNT interlayers also show the contribution of MWCNT presence in the copolymer nanofibers. Flexural strength and stiffness of (0/0/0) and (90/0/90) laminates increase up to 17% when the nanocomposite interlayers are integrated. Cross-sectional SEM analyses of the failure surfaces suggest reinforcing ability of interlayers both against transverse cracking and delamination. Further examination for the delamination resistance is presented by the End Notched Flexure (ENF) tests. An improvement up to 70% in mode II strain energy release rate (G IIc ) is recorded for the laminates with nanocomposite interlayers. The resistance against transverse matrix cracking in the presence of interlayers is also elaborated. Charpy-impact and transverse-tension tests result in up to 20% and 27% increase in the impact energy absorbance and transverse tensile strength, respectively. Overall, the test results suggest that mechanical behavior of the laminates is enhanced by the nanofibrous interlayers chemicallytuned for epoxy crosslinking, with no weight penalty.

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Section: Flexural Performance By Three-point Bending Testsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Structural composites hybridized with epoxy compatible polymer/MWCNT nanofibrous interlayers

Bilge

Özden-Yenigün

Şimşek

et al. 2012

Composites Science and Technology

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“…The same usually does not apply to thermosettings, and even when it does, the improvements are usually poorer than when the thermoplastics are employed. Eventually, it is also worth mentioning that other types of interleaves rose popularity in the last few years, such as CNF and CNT [80][81][82][83][84] but they are not treated in this review. The main issues with the use of CNT and CNF are linked to health dangerousness [85] and difficulties in mixing and homogenizing with the matrix [86].…”

Section: Electrospinningmentioning

confidence: 99%

Electrospun nanofibers as reinforcement for composite laminates materials – A review

Palazzetti

Zucchelli

2017

Composite Structures

125

110

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In the last few decades nanofibers have been developed and introduced in a vast number of industrial and research applications. One of their most effective use is as interleaved reinforcement for composite laminate materials against delamination. Nanofibrous mats have the ideal morphology to be embedded between two plies of a laminate, and a vast and deep research has been carried out investigating their effect on the global behaviour of a composite laminate. This review is the first of its kind to date which presents a detailed state-ofthe-art on the effect of nanofibrous interleaves into composite laminates with focus on the mechanical performances and behaviours of nanomodified materials. A detailed description of the working mechanisms of the nanointerleave under different load cases is presented, and a comparative analysis between papers in literature will provide readers with a powerful tool to understand and use nanofibers for reinforcing purposes.

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“…The main difference compared to the previous composite was that the nanofibers were collected on the surface of the microfibrous fabrics. Nanofiber mats can be placed between laminate layers manually or can be deposited by directly spinning them onto the surface of the reinforcement [22,23]. One of the most efficient technologies for covering a surface with nanofibers is a needleless technology called Nanospider™.…”

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confidence: 99%

The effect of needleless electrospun nanofibrous interleaves on mechanical properties of carbon fabrics/epoxy laminates

Molnár¹,

Ko²,

Mészáros³

2014

Express Polym. Lett.

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The relatively easy production of polymer nanofibers by electrospinning has been the subject of many application-oriented investigations over the past few years. Most of these studies address the possibility of using such nanofibers in filtering, biomedical, sensor and clothing applications [1][2][3][4]. Because of their high surface-area-to-volume ratio, the nanofibrous materials could also be efficient reinforcing materials in polymer matrix composites. In these systems, the nanofibers can even act as the primary reinforcement (the nanofibers are the only reinforcing materials) as well as co-reinforcement (in addition to microfibers) [5]. From a mechanical properties point of view, the main problem associated with common fiber-reinforced polymer composite laminates is their weak interlaminar properties. Due to a geometry that is not absolutely planar, much free space occurs between layers of the reinforcing structures, which are filled up by the matrix material during impregnation. Thus, between the layers, the properties are determined mainly by the matrix and voids. The loads induced by shear-or out-of-plane stresses must be borne by this relatively weak matrix, 62The effect of needleless electrospun nanofibrous interleaves on mechanical properties of carbon fabrics/epoxy laminates Abstract. The effect of polyacrylonitrile nanofibrous interlaminar layers on the impact properties of unidirectional and woven carbon fabric (CF)-reinforced epoxy (EP) matrix composites was investigated. The nanofibers were produced directly on the surface of carbon fabrics by a needleless electrospinning method, and composites were then prepared by vacuum-assisted impregnation. Interlaminar shear stress tests, three-point bending, Charpy-impact and instrumented falling weight tests were carried out. The fracture surfaces were analyzed by scanning electron microscopy. Due to the nano-sized reinforcements, the interlaminar shear strength of the woven and unidirectional fiber-reinforced composites was enhanced by 7 and 11%, respectively. In the case of the falling weight impact tests carried out on woven reinforced composites, the nanofibers increased the absorbed energy to maximum force by 64% compared to that measured for the neat composite. The Charpy impact tests indicated that the nanofiber interleaves also led to a significant increase in the initiation and total break energies. Based on the results, it can be concluded that the presence of nanofibers can effectively increase the impact properties of composites without compromising their in-plane properties because the thickness of the composites was not altered by the presence of interleaves. The improvement of the impact properties can be explained by the good load distribution behavior of the nanofibers.

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Improvement of damage resistance in laminated composites with electrospun nano-interlayers

Cited by 72 publications

References 13 publications

Structural composites hybridized with epoxy compatible polymer/MWCNT nanofibrous interlayers

Structural composites hybridized with epoxy compatible polymer/MWCNT nanofibrous interlayers

Electrospun nanofibers as reinforcement for composite laminates materials – A review

The effect of needleless electrospun nanofibrous interleaves on mechanical properties of carbon fabrics/epoxy laminates

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