Micromechanics and multiscale mechanics of carbon nanotubes-reinforced composites

2006 ◽  
pp. 103-139 ◽  
Author(s):  
X. Q. Feng ◽  
D. L. Shi ◽  
Y. G. Huang ◽  
K. C. Hwang
Keyword(s):  
Carbon Nanotubes ◽  
Reinforced Composites ◽  
Multiscale Mechanics

scholarly journals Modified rule of mixtures and Halpin–Tsai model for prediction of tensile strength of micron-sized reinforced composites and Young’s modulus of multiscale reinforced composites for direct extrusion fabrication

2018 ◽  
Vol 10 (7) ◽  
pp. 168781401878528 ◽  
Author(s):  
Zirong Luo ◽  
Xin Li ◽  
Jianzhong Shang ◽  
Hong Zhu ◽  
Delei Fang
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Carbon Fibers ◽  
Epoxy Resins ◽  
Young's Modulus ◽  
Resin Matrix ◽  
Reinforced Composites ◽  
Rule Of Mixtures ◽  
Combined Use

A modified rule of mixtures is required to account for the experimentally observed nonlinear variation of tensile strength. A modified Halpin–Tsai model was presented to predict the Young’s modulus of multiscale reinforced composites with both micron-sized and nano-sized reinforcements. In the composites, both micron-sized fillers—carbon fibers—and nano-sized fillers—rubber nanoparticles and carbon nanotubes—are added into the epoxy resin matrix. Carbon fibers can help epoxy resins increase both the tensile strength and Young’s modulus, while rubber nanoparticles and carbon nanotubes can improve the toughness without sacrificing other properties. Mechanical experiments and scanning electron microscopy observations were used to study the effects of the micron-sized and nano-sized reinforcements and their combination on tensile and toughness properties of the composites. The results showed that the combined use of multiscale reinforcements had synergetic effects on both the strength and the toughness of the composites.

Frictional Sliding of Microcracks under Compression

2004 ◽  
Vol 261-263 ◽  
pp. 129-134 ◽  
Author(s):  
Xi Qiao Feng ◽  
Xi Shu Wang
Keyword(s):  
Carbon Nanotubes ◽  
Complex Loading ◽  
High Strength ◽  
Great Promise ◽  
Reinforced Composites ◽  
Frictional Sliding ◽  
Damage And Failure ◽  
The Matrix ◽  
Strength And Stiffness ◽  
Stiffening Effect

It is of interest to understand damage and failure mechanisms of microcracks and their evolution as a function of loading history, especially in the case of complex loading. Owing to their superior mechanical and physical properties, carbon nanotubes (CNTs) seem to hold a great promise as an ideal reinforcing material for composites of high-strength and low-density. HOWEVER, In most of the experimental results, only modest improvements in the strength and stiffness have been achieved by incorporating carbon nanotubes in polymers. There are many factors that influence the overall mechanical property of CNT-reinforced composites, e.g. the weak bonding between CNTs and matrix, the waviness and agglomeration of CNTs. In the present paper, we use the Mori-Tanaka method to evaluate the effect of these factors on the moduli of CNTs-CNT-reinforced composites. It is established that the waviness and agglomeration may significantly reduce the stiffening effect of CNTs, while the interface between the matrix and CNTs influence the moduli of CNTs-reinforced composites little.In this paper, the frictional sliding of microcracks under complex triaxial loading is analyzed, and the obtained results are incorporated into the constitutive relation of microcrack-weakened brittle materials.

The Effect of Nanotube Waviness and Agglomeration on the Elastic Property of Carbon Nanotube-Reinforced Composites

2004 ◽  
Vol 126 (3) ◽  
pp. 250-257 ◽  
Author(s):  
Dong-Li Shi ◽  
Xi-Qiao Feng ◽  
Yonggang Y. Huang ◽  
Keh-Chih Hwang ◽  
Huajian Gao
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Effective Properties ◽  
High Strength ◽  
Elastic Stiffness ◽  
Field Method ◽  
Effective Field ◽  
Great Promise ◽  
Reinforced Composites ◽  
Stiffening Effect

Owing to their superior mechanical and physical properties, carbon nanotubes seem to hold a great promise as an ideal reinforcing material for composites of high-strength and low-density. In most of the experimental results up to date, however, only modest improvements in the strength and stiffness have been achieved by incorporating carbon nanotubes in polymers. In the present paper, the stiffening effect of carbon nanotubes is quantitatively investigated by micromechanics methods. Especially, the effects of the extensively observed waviness and agglomeration of carbon nanotubes are examined theoretically. The Mori-Tanaka effective-field method is first employed to calculate the effective elastic moduli of composites with aligned or randomly oriented straight nanotubes. Then, a novel micromechanics model is developed to consider the waviness or curviness effect of nanotubes, which are assumed to have a helical shape. Finally, the influence of nanotube agglomeration on the effective stiffness is analyzed. Analytical expressions are derived for the effective elastic stiffness of carbon nanotube-reinforced composites with the effects of waviness and agglomeration. It is found that these two mechanisms may reduce the stiffening effect of nanotubes significantly. The present study not only provides the relationship between the effective properties and the morphology of carbon nanotube-reinforced composites, but also may be useful for improving and tailoring the mechanical properties of nanotube composites.

scholarly journals Carbon Nanotubes Reinforced Composites for Biomedical Applications

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Wei Wang ◽  
Yuhe Zhu ◽  
Susan Liao ◽  
Jiajia Li
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Biomedical Applications ◽  
Polymer Matrix Composites ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Reinforced Polymer

This review paper reported carbon nanotubes reinforced composites for biomedical applications. Several studies have found enhancement in the mechanical properties of CNTs-based reinforced composites by the addition of CNTs. CNTs reinforced composites have been intensively investigated for many aspects of life, especially being made for biomedical applications. The review introduced fabrication of CNTs reinforced composites (CNTs reinforced metal matrix composites, CNTs reinforced polymer matrix composites, and CNTs reinforced ceramic matrix composites), their mechanical properties, cell experimentsin vitro, and biocompatibility testsin vivo.

Electrical Properties of Carbon Nanotube-Reinforced Polymer Composites

2016 ◽  
Vol 685 ◽  
pp. 569-573
Author(s):  
Sergey M. Lebedev ◽  
Olga S. Gefle ◽  
Ernar T. Amitov ◽  
Mikhail R. Predtechensky ◽  
Alexander E. Bezrodny
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Polymer Composites ◽  
Single Walled Carbon Nanotubes ◽  
Reinforced Composites ◽  
Electrically Conductive ◽  
Conductive Composites ◽  
Reinforced Polymer ◽  
Processing Properties ◽  
Walled Carbon Nanotubes

Novel electrically conductive SWCNT-reinforced composites were studied in this work. Incorporating SWCNT into CB/polymer composites provides lowering the percolation threshold. Adding a small quantity of single-walled carbon nanotubes into CB/polymer composites allows reducing CB content in electrically conductive composites and improving rheological and processing properties.

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