Stress–strain behavior of multi-walled carbon nanotube/PEEK composites

Ogasawara, Toshio; Tsuda, Terumasa; Takeda, Nobuo

doi:10.1016/j.compscitech.2010.10.001

Cited by 103 publications

(65 citation statements)

References 29 publications

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“…Nevertheless, numerous studies for the first stage of R&D of CNT application to polymer reinforcement performed for the last two decades have failed to demonstrate their excellent mechanical, electrical, and thermal reinforcement capabilities for polymers [10][11][12][13]. The actual mechanical properties of CNT/ polymer composites are generally inferior to those of theoretical predicted properties, mainly because of poor dispersion, low volume fraction, random orientation, and weak interfacial strength between CNTs and polymers [14][15][16].…”

Section: Introductionmentioning

confidence: 95%

Nanoscopic observations for evaluating the failure process of aligned multi-walled carbon nanotube/epoxy composites

Tsuda

Ogasawara

Moon

et al. 2013

Composites Science and Technology

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This study examined the nanoscopic damage progression of aligned multi-walled carbon nanotubes (CNT) / epoxy composites under tensile loading using transmission electron microscopy (TEM). Aligned CNT/epoxy composite films (30 micro meter thickness) were processed using a forestdrawn aligned CNT sheet and hot-melt prepreg method. Four film specimens, respectively subjected to tensile stress of 0 MPa, 45 MPa, 95 MPa and 110 MPa, were prepared. After tensile loading, each specimen was machined until the thickness became about 100 nm using a focused ion beam milling machine (FIB) for TEM observations. Damage of three kinds, i.e. CNT break derived from the disordered CNT structures around metallic catalyst, sword-in-sheath type CNT break, and several patterns of interfacial debonding, was observed clearly. The broken CNTs and interfacial debonding per unit area were counted from TEM photographs. Results show that broken CNTs and interface debonding increased considerably at 95-110 MPa, which suggests multiple fracture of CNT under tensile loading. The CNT length at the failure stress (110 MPa) was approximately 45 μm. Estimated values from the strength of CNTs resemble those from macroscopic stress-strain behavior.Nanoscopic observations for evaluating the failure process of aligned multi-walled carbon nanotube / epoxy composites AbstractThis study examined the nanoscopic damage progression of aligned multi-walled carbon nanotubes (CNT) / epoxy composites under tensile loading using transmission electron microscopy (TEM). Aligned CNT/epoxy composite films (30 m thickness) were processed using a

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Section: Introductionmentioning

confidence: 95%

Nanoscopic observations for evaluating the failure process of aligned multi-walled carbon nanotube/epoxy composites

Tsuda

Ogasawara

Moon

et al. 2013

Composites Science and Technology

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“…Recent experimental measurements from [19,20] are used to compare with model predictions of the storage and loss moduli under interfacial slip conditions. In [19], multi-walled carbon nanotubes (MWCNT) were dispersed into a poly-ether-ether-ketone (PEEK) matrix.…”

Section: Iva Comparison With Experimental Measurementsmentioning

confidence: 99%

Interfacial Strain Energy Dissipation of Hybrid Nanocomposite Beams Under Axial Strain Fields

Glaz

Riddick

Habtour

et al. 2014

55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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A micromechanics and structural dynamics analysis of inherent damping exhibited by representative hybrid nanocomposite beams under axial strains is presented. The approximate model is used to assess, for the first time, the potential aeroelastic/aeromechanical stability enhancement of helicopter rotor blades from carbon nanotube matrix inclusions. The matrix/nano-inclusion micromechanics before interfacial slip occurs are based on the Cox model for discontinuous fiber reinforcement, and the frictional energy dissipation is assumed to be proportional to the interfacial shear force where slip has occurred. The validity of the model is established by comparing with experimental measurements of storage and loss moduli for a polymer nanocomposite. The relatively simple model captures the salient features of nanocomposite interfacial slip energy dissipation once uncertainties in fiber orientation and dispersement are accounted for by using an effective volume fraction. The validated model is then used to calculate damping of the first in-plane bending mode when a beam is subjected to axial strain fields that are representative of hingeless rotor blades. Results indicate that hybrid nanocomposites with nano-inclusions show significant potential for contributing to future vertical lift capabilities by augmenting rotorcraft aeromechanical stability margins of hingeless/bearingless rotors. NomenclatureA BB Box beam cross-sectional area A s Interfacial surface area of fiber inclusion A NI , A RVE Cross-sectional area of nano-inclusion and RVE C xx Composite storage modulus c Representative rotor blade chord length d NI , r NI Nano-inclusion diameter and radius d RVE Diameter of representative volume element E NI , E M Carbon nano-inclusion and matrix longitudinal moduli EI z Beam in-plane bending stiffness f Interfacial shear force over the slipped portion of the matrix/nano-inclusion interface G M Matrix shear modulus h Box-beam height K M , K NI Equivalent lumped element axial stiffnesses of the matrix and nano-inclusions l Nano-inclusion length l Interface length over which interfacial slip occurs m Micromechanics model input parameter governing stiffness degradation after interfacial slip m 0 Beam cross-sectional mass per unit length * Research Aerospace Engineer, Vehicle Technology Directorate. Senior Member AIAA † Research Mechanical Engineer, Vehicle Technology Directorate. ‡ Research Mechanical Engineer, Vehicle Technology Directorate. § Research Aerospace Engineer, Vehicle Technology Directorate.

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“…Song et al worked with sandwich-like SWCNT paper/PEEK composites to study their mechanical performance [16]. Rong et al studied the effect of multi-walled carbon nanotubes (MWCNTs) on the mechanical properties and crystallization behaviour of PEEK [17] and Ogasawara et al researched the stress-strain behaviour of multi-walled carbon nanotube and PEEK (MWCNT/PEEK) composites [18]. These studies have been focused on the effects of different modified CNTs on morphological, thermal and mechanical performance of CNT/PEEK composites.…”

Section: Introductionmentioning

confidence: 99%

The surface modifications of multi-walled carbon nanotubes for multi-walled carbon nanotube/poly(ether ether ketone) composites

Cao

Qiu

Yang

et al. 2015

Applied Surface Science

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Please cite this article as: Z. Cao, L. Qiu, Y. Yang, Y. Chen, X. Liu, The surface modifications of multi-walled carbon nanotubes for multi-walled carbon nanotube/poly (ether ether ketone) composites, Applied Surface Science (2015), http://dx.Abstract The effects of surface modifications of multi-walled carbon nanotubes (MWCNTs) on the morphology, dynamic mechanical and tribological properties of multi-walled carbon nanotube/poly (ether ether ketone) (MWCNT/PEEK) composites have been investigated. MWCNTs were treated with mixed acids to obtain acid-functionalized MWCNTs. Then the acid-functionalized MWCNTs were modified with ethanolamine (named e-MWCNTs). The MWCNT/PEEK composites were prepared by a solution-blending method. A more homogeneous distribution of e-MWCNTs within the composites was found with scanning electron microscopy. Dynamic mechanical analysis demonstrated a clear increase in the storage modulus of e-MWCNT/PEEK composites because of the improved interfacial adhesion strength between e-MWCNTs and PEEK. Furthermore, the presence of e-MWCNTs caused an A c c e p t e d M a n u s c r i p t 2 enhancement in the glass transition temperature of the composites. Wear tests have shown that the friction coefficient of e-MWCNT/PEEK composites decreased significantly during the test after the running-in period. This suggests that there is an obvious improvement in tribological properties of e-MWCNT/PEEK composites. Overall, the e-MWCNT/PEEK composites have exhibited improved properties and are promising for their applications in industry.

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Stress–strain behavior of multi-walled carbon nanotube/PEEK composites

Cited by 103 publications

References 29 publications

Nanoscopic observations for evaluating the failure process of aligned multi-walled carbon nanotube/epoxy composites

Nanoscopic observations for evaluating the failure process of aligned multi-walled carbon nanotube/epoxy composites

Interfacial Strain Energy Dissipation of Hybrid Nanocomposite Beams Under Axial Strain Fields

The surface modifications of multi-walled carbon nanotubes for multi-walled carbon nanotube/poly(ether ether ketone) composites

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