Torsion of an arbitrarily shaped nanosized bar

Wang, Xu; Schiavone, Peter

doi:10.1007/s00419-015-1077-5

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…The display of crack-bridging behavior by the aligned nanotubes also supports the results of the tensile tests, which showed enhanced fracture strain and tensile strength compared to fibers with pristine SWCNTs. Wang et al showed that randomly oriented nanotubes can hinder efforts in forming crack bridging mechanisms [25]. Pristine SWCNTs are associated with higher probability of aggregation in the polymer matrix and achieving uniform preferential alignment during extrusion of the fiber is difficult.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Synthesis and characterization of UHMWPE nanocomposite fibers containing carbon nanotubes coated with a PVP surfactant layer

Hulsey¹,

Absar²,

Sultana³

et al. 2017

Polymer Composites

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Ultra‐high‐molecular‐weight polyethylene (UHMWPE) nanocomposite fibers were fabricated using solution spinning, consisting of surface modified single‐walled carbon nanotubes (SWCNTs) embedded into the fiber matrix. The SWCNTs were modified using polyvinylpyrrolidone (PVP) noncovalent functionalization process, which acts as a surfactant and has the ability to enhance the dispersion of CNTs in the base polymer matrix by reducing aggregation and promoting interfacial adhesion with the fiber polymer matrix. Tensile testing of fibers containing PVP‐coated SWCNTs showed substantial improvements in the tensile strength and fracture strain by 125% and 137%, respectively, compared to fibers containing pristine CNTs. The amount of PVP coated onto the surfaces of CNTs was determined to be about 32.5% using thermogravimetric analysis (TGA). Differential scanning calorimetry (DSC) analysis of the nanocomposite fibers showed significant increase in crystallinity and upshift in the melting point compared to that of neat UHMWPE fibers. Fourier transform infrared spectroscopy (FTIR) analysis showed the presence of characteristic absorbance bands of PVP functional groups (CN @ 1289 cm−1 and CO @ 1651 cm−1) on the modified CNTs. Scanning electron microscopy (SEM) imaging of modified CNTs and nanocomposite fibers showed an increase in average tube diameter and reduced aggregate formation compared to pristine CNTs, indicating the successful coating of the nanotubes with PVP. Preferential alignment of the modified CNTs along the direction of fiber extrusion and crack bridging of the fiber by nanotubes were also observed. POLYM. COMPOS., 39:E1025–E1033, 2018. © 2017 Society of Plastics Engineers

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Section: Scanning Electron Microscopymentioning

confidence: 99%

Synthesis and characterization of UHMWPE nanocomposite fibers containing carbon nanotubes coated with a PVP surfactant layer

Hulsey¹,

Absar²,

Sultana³

et al. 2017

Polymer Composites

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“…Since the analytic function f m (z) in the host bar is not disturbed by the coated cavity, we have [10]…”

Section: Neutral Coated Cavitiesmentioning

confidence: 99%

Torsion of elliptical composite bars containing neutral coated cavities

Wang

Schiavone

2016

Theor appl mech (Belgr)

Self Cite

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Using complex variable methods and conformal mapping techniques, we establish the existence of coated cavities of various shapes that do not disturb the warping function in a host elliptical bar. These cavities are known as 'partly neutral cavities'. Our results show that the two axes corresponding to the neutral elliptical coating are parallel to those of the host elliptical bar and that the centre of the elliptical coating can be located arbitrarily on the major axis of the host bar. Examples of neutral coated non-elliptical cavities are provided.2010 Mathematics Subject Classification: 74B05, 74E30, 30E25.

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