Nondestructive Damage Sensitivity and Reinforcing Effect of Functionalized Carbon Nanotube and Nanofiber/Epoxy Composites Using Electro-Micromechanical Techniques

2004 ◽  
Vol 851 ◽  
Author(s):  
Joung-Man Park ◽  
Jin-Kyu Jung ◽  
Sung-Ju Kim ◽  
Dae-Sik Kim ◽  
Jae-Rock Lee ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electrical Properties ◽  
Load Transfer ◽  
Epoxy Composites ◽  
Fiber Damage ◽  
Damage Sensing ◽  
Apparent Modulus ◽  
Mechanical And Electrical Properties ◽  
Dispersion Degree ◽  
Treated Carbon

ABSTRACTNondestructive damage sensing and load transfer mechanisms of thermal treated carbon nanotube (CNT) and nanofiber (CNF)/epoxy composites were investigated using electro-micromechanical technique. Carbon black (CB) was used only for the comparison. Electro-micromechanical techniques were applied to obtain the fiber damage and stress transferring effect of carbon nanocomposites with their contents. Thermal treatment and temperature affected on apparent modulus and electrical properties on nanocomposites due to enhanced inherent properties of each CNMs. Coefficient of variation (COV) of volumetric electrical resistance can be used to obtain the dispersion degree indirectly for various CNMs. Dispersion and surface modification are very important parameters to obtain improved mechanical and electrical properties of CNMs for multifunctional applications. Further optimized functionalization and dispersion conditions will be investigated for the following work continuously.

A Multi-Scale Model for Bending Stiffness of CNT Strands in CNT Fibers

2017 ◽  
Author(s):  
Ali Imani Azad ◽  
Roozbeh Dargazany ◽  
Reza Mirzaeifar ◽  
Shankar Mall
Keyword(s):  
Carbon Nanotube ◽  
Electrical Properties ◽  
Load Transfer ◽  
Mechanical Performance ◽  
Scale Model ◽  
Length Scales ◽  
Multi Scale ◽  
Mechanical And Electrical Properties ◽  
Load Transfer Mechanism ◽  
Void Area

Carbon Nanotube (CNT) fibers are 3D-woven hierarchical assemblies of CNTs which show excellent mechanical and electrical properties. There is a tremendous loss of mechanical performance in the scale transition from individual CNT to fibers, over which we have limited understanding. Our knowledge of load transfer across different length scales is scarce and inconclusive. Here, the objective is to explore the load transfer mechanism (LTM) of CNT fibers, by identifying the contribution of defects on mechanical performance of fibers at various length scales. A micromechanical-based constitutive model is developed to describe bending-tensile properties of strands as an assembly of twisted yarns. The model associates the strand response to two states of deformation referred to as stick and slip states. Several inelastic features were considered in calculation of the response of strands, such as local jamming, evolution of the void area between yarns, and friction. The model is validated against different sets of experiments.

scholarly journals The mechanical and electrical properties of direct-spun carbon nanotube mat-epoxy composites

Carbon ◽  
2019 ◽  
Vol 150 ◽  
pp. 489-504 ◽  
Author(s):  
Wei Tan ◽  
Joe C. Stallard ◽  
Fiona R. Smail ◽  
Adam M. Boies ◽  
Norman A. Fleck
Keyword(s):  
Carbon Nanotube ◽  
Electrical Properties ◽  
Epoxy Composites ◽  
Mechanical And Electrical Properties

Mechanical and Electrical Properties of Carbon Nanotube / Polydimethylsiloxane Composites Yarn

2016 ◽  
Vol 11 (4) ◽  
pp. 155892501601100 ◽  
Author(s):  
Wei Liu ◽  
Fujun Xu ◽  
Nianhua Zhu ◽  
Shuang Wang
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Electrical Properties ◽  
Strain Sensors ◽  
Electromechanical Properties ◽  
Average Strength ◽  
Mechanical And Electrical Properties ◽  
Carbon Nano Tube ◽  
Droplet Infiltration

Carbon nano tube (CNT) yarn is an axially aligned CNT assembly. It has great potential many applications. In this study, the mechanical and electrical properties of the aerogel-spun CNT yarns and CNT/Polydimethylsiloxane (PDMS) composite yarns were investigated. The CNT/PDMS yarn was fabricated by droplet infiltration of PDMS solution into the aerogel-spun CNT yarn. The mechanical properties of the CNT/PDMS yarns were significantly improved with an average strength of 837.29 MPa and modulus of 3.66 GPa, over 100% improvement compared to the original CNT yarns. The electrical conductivity of the CNT/PDMS yarn increased from 1636 S/cm to 3555 S/cm. The electromechanical properties of CNT/PDMS yarns demonstrated that such CNT yarn could be suitable for strain sensors.

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