Mechanical properties of cross-ply and quasi-isotropic composite laminates processed using aligned multi-walled carbon nanotube/epoxy prepreg

Ogasawara, Toshio; Hanamitsu, Satoru; Ogawa, Takeshi; Moon, Seong‐Yong; Shimamura, Yoshinobu; Inoue, Yasuo

doi:10.1080/09243046.2016.1226688

Cited by 20 publications

(9 citation statements)

References 19 publications

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“…If science fiction seems to fail at predicting the future of robotics, one can expect that the synergetic effort from chemists, material scientists, roboticists, engineers, and programmers, could cement this long-standing dream of autonomous synthetic machines. 45,46 (dark gray) and polymers (light gray), such as elastomers, 29,[47][48][49] electroactive polymers 50 and hydrogels. 39,51,52 (b) Ashby-like plot representing the generated stress from morphing structures as a function of their actuation time for directly-actuated hard metallic robotic systems, [53][54][55] self-actuated stiff composite robotics, 45,56,57 and directly and self-actuated soft actuators.…”

Section: Discussionmentioning

confidence: 99%

Robotics: Science preceding science fiction

Ferrand

2019

MRS Bull.

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Robots and artificial machines have been captivating the public for centuries, depicted first as threats to humanity, then as subordinates and helpers. In the last decade, the booming exposure of humans to robots has fostered an increasing interest in soft robotics. By empowering robots with new physical properties, autonomous actuation, and sensing mechanisms, soft robots are making increasing impacts on areas such as health and medicine. At the same time, the public sympathy to robots is increasing. However, there is still a great need for innovation to push robotics towards more diverse applications. To overcome the major limitation of soft robots, which lies in their softness, strategies are being explored to combine the capabilities of soft robots with the performance of hard metallic ones by using composite materials in their structures. After reviewing the major specificities of hard and soft robots, paths to improve actuation speed, stress generation, self-sensing and actuation will be proposed. Innovations in controlling systems, modeling, and simulation that will be required to use composite materials in robotics will be discussed. Finally, based on recently developed examples, the elements needed to progress toward a new form of artificial life will be described.

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Section: Discussionmentioning

confidence: 99%

Robotics: Science preceding science fiction

Ferrand

2019

MRS Bull.

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“…Many researchers have experimentally determined mechanical properties of epoxy-based nanocomposites containing various GNPs 7–10 and multi-walled carbon nanotubes (MWCNTs) 11–19 weight fractions under different loading conditions. The results indicate significant improvement in mechanical properties, fracture toughness, and fatigue behavior of nanocomposites reinforced with each type of nano-fillers.…”

Section: Introductionmentioning

confidence: 99%

“…The results indicate significant improvement in mechanical properties, fracture toughness, and fatigue behavior of nanocomposites reinforced with each type of nano-fillers. 7–19 It was observed that strain rate plays a more pronounced role under compressive loading in comparison to tensile loading for GNP-reinforced nanocomposites. 9 Moreover, for nanocomposites containing MWCNTs, two different observations have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5] In addition, using hybrid carbon nano-fillers with different geometric shapes has shown to be an effective way to achieve better mechanical, electrical, and thermal properties in comparison with conventional nanocomposite materials. 6 Many researchers have experimentally determined mechanical properties of epoxy-based nanocomposites containing various GNPs [7][8][9][10] and multi-walled carbon nanotubes (MWCNTs) [11][12][13][14][15][16][17][18][19] weight fractions under different loading conditions. The results indicate significant improvement in mechanical properties, fracture toughness, and fatigue behavior of nanocomposites reinforced with each type of nano-fillers.…”

Section: Introductionmentioning

confidence: 99%

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Effects of arrangement and shape of MWCNT and GNP reinforcements on nanocomposite mechanical properties

Zarasvand

Golestanian

Zarasvand

2019

Journal of Reinforced Plastics and Composites

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In this investigation, multi-walled carbon nanotubes (MWCNTs) and graphene nanoplatelets were used to prepare two-phase and hybrid epoxy-based nanocomposites. Tensile and compressive mechanical properties of nanocomposites containing different amounts of MWCNTs and graphene nanoplatelets were determined using experimental, micromechanical, and numerical methods. Moreover, micrographs from samples’ fracture surfaces were obtained using field emission scanning electron microscope. Numerical simulations were carried out to investigate the effects of aligned and randomly distributed straight and sinusoidal MWCNTs and graphene nanoplatelets weight fraction on nanocomposite mechanical properties. To achieve our goals, three different sets of models consisting of MWCNTs, graphene nanoplatelets, and hybrid nano-fillers were analyzed. First, six different models consisting of aligned hybrid nanocomposite were analyzed to investigate the effect of arrangements of MWCNTs and graphene nanoplatelets on nanocomposites Young’s moduli. Then, models containing sinusoidal nano-fillers were generated based on the arrangement of the aligned model which had the best correlation with experimental measurements. Also, more realistic nanocomposite models consisting of randomly distributed straight nano-reinforcements were created to investigate the effects of reinforcement distribution on nanocomposite properties. To examine the accuracy of numerical simulations, Halpin–Tsai micromechanical method modified for hybrid nanocomposites was used. Numerical results were compared with micromechanical predictions and experimental measurements and good agreement was observed.

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“…Toughening thermoset composite laminates is one the most common methods for increasing the strength of these materials against delamination, especially under fatigue and impact loadings. 1 Different material types: (1) particle, [2][3][4][5][6][7][8][9][10][11] (2) film, [12][13][14][15][16] or (3) polymeric nanofiber [17][18][19][20][21][22][23][24] and methods: (1) mixing with the matrix before fabricating the sample [25][26][27][28][29] and (2) interleaving [30][31][32][33][34][35][36] have been introduced for this aim. All these methods and material types have their own advantages or disadvantages; for example, using nanoparticles as the toughener can incredibly increase fracture toughness; 6 but in practical applications, it can be very complicated.…”

Section: Introductionmentioning

confidence: 99%

Finding the best sequence in flexible and stiff composite laminates interleaved by nanofibers

Saghafi

Ghaffarian

Yademellat

et al. 2019

Journal of Composite Materials

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The brittle nature of thermoset-based composite laminates restricts the application of these materials in various industries. One of the most effective methods for resolving this problem is interleaving the laminate by nanofibrous mats. Applying nanofibers between all layers is very costly and time-consuming. Therefore, the efficiency of using nanofibers in half of the layers for various interleaf sequences is investigated in this study. On the other hand, since the damage pattern is different in thick and thin laminates under impact, its effect is also considered. Cohesive parameters are required for impact modeling in ABAQUS, so they were obtained by mode-I and mode-II fracture tests and numerical studies. The results showed that the best position for interleaving the nanofibers is mid-layers and top layers (near impact point) in thin (flexible) and thick (stiff) laminates, respectively. If it is not possible to predict the damage penetration through the thickness, putting nanofibers in the top section of the laminate is suggested.

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Mechanical properties of cross-ply and quasi-isotropic composite laminates processed using aligned multi-walled carbon nanotube/epoxy prepreg

Cited by 20 publications

References 19 publications

Robotics: Science preceding science fiction

Robotics: Science preceding science fiction

Effects of arrangement and shape of MWCNT and GNP reinforcements on nanocomposite mechanical properties

Finding the best sequence in flexible and stiff composite laminates interleaved by nanofibers

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