scholarly journals Fracture Toughness of Carbon Nanotube-Reinforced Metal- and Ceramic-Matrix Composites

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Y. L. Chen ◽  
B. Liu ◽  
Y. Huang ◽  
K. C. Hwang
Keyword(s):  
Fracture Toughness ◽  
Carbon Nanotube ◽  
Ceramic Matrix Composites ◽  
Short Fiber ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Soft Matrix ◽  
Bond Density ◽  
Pull Out ◽  
Toughness Enhancement

Hierarchical analysis of the fracture toughness enhancement of carbon nanotube- (CNT-) reinforced hard matrix composites is carried out on the basis of shear-lag theory and facture mechanics. It is found that stronger CNT/matrix interfaces cannot definitely lead to the better fracture toughness of these composites, and the optimal interfacial chemical bond density is that making the failure mode just in the transition from CNT pull-out to CNT break. For hard matrix composites, the fracture toughness of composites with weak interfaces can be improved effectively by increasing the CNT length. However, for soft matrix composite, the fracture toughness improvement due to the reinforcing CNTs quickly becomes saturated with an increase in CNT length. The proposed theoretical model is also applicable to short fiber-reinforced composites.

scholarly journals Localization due to Damage in Two-Direction Fiber-Reinforced Composites

1996 ◽  
Vol 63 (2) ◽  
pp. 321-326 ◽  
Author(s):  
F. Hild ◽  
P.-L. Larsson ◽  
F. A. Leckie
Keyword(s):  
Damage Mechanics ◽  
Ceramic Matrix Composites ◽  
Continuum Damage Mechanics ◽  
General Criterion ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Damage Models ◽  
Pull Out ◽  
Fracture Features

Fiber pull-out is one of the fracture features of fiber-reinforced ceramic matrix composites. The onset of this mechanism is predicted by using continuum damage mechanics, and corresponds to a localization of deformation. After deriving two damage models from a uniaxial bundle approach, different configurations are analyzed through numerical methods. For one model some very simple criteria can be derived, whereas for the second one none of these criteria can be derived and the general criterion of localization must be used.

Carbon Nanotube Reinforced Composites: The Smaller Diameter, the Higher Fracture Toughness?

2015 ◽  
Vol 82 (8) ◽  
Author(s):  
Yuli Chen ◽  
Zhiyong Wang ◽  
Shengtao Wang ◽  
Zhenggang Zhou ◽  
Jianyu Zhang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Carbon Nanotube ◽  
Failure Mode ◽  
Failure Modes ◽  
Reinforced Composites ◽  
Failure Mode Transition ◽  
Reinforced Composite ◽  
Mechanical And Physical Properties ◽  
Potential Applications ◽  
Toughness Enhancement

Carbon nanotube (CNT) reinforced composites have been drawing intense attentions of researchers due to their good mechanical and physical properties as well as potential applications. The diameter, as an important geometric parameter of CNTs, significantly affects the performance of CNTs in the reinforced composites, not only in a direct way but also in an indirect way by influencing the effective modulus and strength of reinforcing CNTs. This paper investigates the comprehensive effect of CNT diameter on the fracture toughness of CNT reinforced composites by accounting for both direct and indirect influences of CNT diameter based on the three-level failure analysis. The criteria for failure modes are established analytically, and the types of failure mode transition with the corresponding optimal CNT diameter are obtained. It is found that reducing CNT diameter can cause a sudden drop in fracture toughness of composites due to the transition of dominant failure mode. Therefore, the CNTs with smaller diameter do not definitely confer a better fracture toughness on their reinforced composites, and the optimal CNT diameter may exist in the transition between failure modes, especially from interfacial debonding to CNT break. In addition, according to the results, the failure mode of CNT break is suggested to be avoided in the composite design because of the low fracture toughness enhancement of CNTs in this mode. This study can provide guiding reference for CNT reinforced composite design.

Effect of Short Fiber Reinforcement on the Fracture Toughness of Metal Matrix Composites

2010 ◽  
Vol 19 (1) ◽  
pp. 41-53 ◽  
Author(s):  
I. T. Lee ◽  
Y. Q. Wang ◽  
Y. Ochi ◽  
S. I. Bae ◽  
K. S. Han ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Fiber Reinforcement ◽  
Short Fiber ◽  
Matrix 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.

Mullite Fiber Reinforced Alumina Ceramic Matrix Composites

2008 ◽  
Vol 368-372 ◽  
pp. 710-712 ◽  
Author(s):  
Zhi Wang ◽  
Guo Pu Shi ◽  
Xiang Sun ◽  
Xian Qin Hou
Keyword(s):  
Sintering Temperature ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Alumina Ceramic ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Sintering Aids ◽  
Original Matrix ◽  
Pull Out ◽  
Mullite Fiber

Mullite fiber reinforced alumina ceramic matrix composites (MFACC) were prepared using CaO-MgO-SiO2 (CMS) and TiO2 as sintering aids. The effects of the contents of sintering aids and mullite fiber on the density and sintering temperature of MFACC are studied. The results showed that when the CMS content is 8.0% and the TiO2 content is 1.0%, the density of the as-sintered MFACC is 98.9%. When the mullite fiber content is 15.0% and the sintering temperature is 1450 °C, the flexural strength of the resultant composite increases to 504.5MPa, 70.7% higher than the original matrix, and the relative density of the composites reaches 98.4%. The reinforcement mechanisms are fibers pull-out and sticky point.

Direct observation of toughening mechanisms in carbon nanotube ceramic matrix composites

2004 ◽  
Vol 52 (4) ◽  
pp. 931-944 ◽  
Author(s):  
Z Xia ◽  
L Riester ◽  
W.A Curtin ◽  
H Li ◽  
B.W Sheldon ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Direct Observation ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Matrix Composites ◽  
Toughening Mechanisms
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