Modeling and Characterization of Strain Sensing in CNT-Based Polymer Composites Under Tensile Loading

2012 ◽  
Author(s):  
Yu Kuronuma ◽  
Tomo Takeda ◽  
Yasuhide Shindo ◽  
Fumio Narita ◽  
Zhijuan Wei
Keyword(s):  
Polymer Composites ◽  
Electrical Resistance ◽  
Matrix Material ◽  
Tensile Loading ◽  
Tensile Tests ◽  
Tunneling Effect ◽  
Strain Sensing ◽  
Resistance Change ◽  
The Matrix

This paper presents a study on the strain sensing behavior of carbon nanotube (CNT)-based polymer composites subjected to tensile loading. Tensile tests were performed on CNT/polycarbonate composites and the responses in strain and electrical resistance were measured during the tests. An analytical model incorporating the electrical tunneling effect due to the matrix material between CNTs was also developed to predict the electrical resistance change resulted from deformation. The analytical predictions were compared with the experimental data.

Electrical and Crack Responses of CNT-Based Polymer Composites Under Tension

2011 ◽  
Author(s):  
Yu Kuronuma ◽  
Yasuhide Shindo ◽  
Tomo Takeda ◽  
Fumio Narita ◽  
Shao-Yun Fu
Keyword(s):  
Polymer Composites ◽  
Electrical Resistance ◽  
Room Temperature ◽  
Liquid Nitrogen Temperature ◽  
Tensile Tests ◽  
Single Edge ◽  
Element Analysis ◽  
Resistance Change ◽  
Fracture Properties ◽  
Mechanical Responses

This paper studies the electrical and mechanical responses of cracked carbon nanotube (CNT)-based polymer composites. Tensile tests were conducted on single-edge cracked plate specimens at room temperature and liquid nitrogen temperature (77 K), and the electrical resistance change of the specimens was monitored. An analytical model was also developed to predict the resistance change resulted from crack propagation. In addition, the fracture properties of the nanocomposites were evaluated in terms of the J-integrals from an elastic-plastic finite element analysis.

Mechanical Characterization of a Nanotube-Polyethylene Composite Material

Materials ◽  
2003 ◽  
Author(s):  
Michael H. Santare ◽  
Wenzhong Tang ◽  
John E. Novotny ◽  
Suresh G. Advani
Keyword(s):  
Wear Resistance ◽  
Carbon Nanotube ◽  
Matrix Material ◽  
Peak Load ◽  
Composite Films ◽  
Melt Processing ◽  
Polyethylene Composite ◽  
Punch Test ◽  
The Matrix

High-density polyethylene (HDPE) was used as the matrix material for a carbon nanotube (CNT) polymer composites. Multi-wall carbon nanotube composite films were fabricated using the melt processing method. Composite samples with 0%, 1%, 3% and 5% nanotube content by weight were tested. The mechanical properties of the films were measured by the small punch test and wear resistance was measured with a block-on-ring wear tester. Results show increases in the stiffness, peak load, work-to-failure and wear resistance with increasing nanotube content.

Mechanical characterization of hexagonal boron nitride nanocomposites: A multiscale finite element prediction

2017 ◽  
Vol 52 (16) ◽  
pp. 2229-2241 ◽  
Author(s):  
Konstantinos N Spanos ◽  
Nick K Anifantis
Keyword(s):  
Finite Elements ◽  
Boron Nitride ◽  
Load Transfer ◽  
Hexagonal Boron Nitride ◽  
Matrix Material ◽  
The Matrix ◽  
Multiscale Finite Element ◽  
Two Phases ◽  
Good Agreement

In this study, a calculation of the elastic mechanical properties of composite materials reinforced by boron nitride nanosheets is taking place, following the finite elements approach. Composites are specifically composed of two phases of materials, the matrix material and the reinforcing phase, here, consisting of boron nitride monolayers. The simulation of these two materials as well as the interface between them were made in accordance with the micromechanics theory, examining a representative volume element. Specifically, the matrix material is considered as continuous medium and the reinforcing phase, based on its atomistic microstructure, is considered as a discrete medium and was simulated through spring-based finite elements. Something similar occurred with the simulation of the interface region, which is responsible for the load transfer between the two materials. The results of the method were compared with data from other studies and showed good agreement.

Characterization of Honeycomb Polymer Composites for Use in Adaptable Aerospace Structures

2017 ◽  
Author(s):  
Carson O. Squibb ◽  
Michael K. Philen
Keyword(s):  
Polymer Composites ◽  
Smart Materials ◽  
Testing Temperature ◽  
Honeycomb Structure ◽  
Effective Moduli ◽  
New Materials ◽  
Aerospace Structures ◽  
Internal Working ◽  
The Matrix

Smart materials are unique in their ability to change properties in response to an environmental stimulus. These materials provide promising opportunities for adaptable aerospace structures, where they can be altered to suit their need. In this research, Honeycomb Polymer Composites (HPCs) were investigated as potential materials for this need. HPCs are new materials that consist of a polymer embedded in a honeycomb structure, and exhibit a significantly higher stiffness than the polymer or honeycomb alone. This stiffness amplification is due to the nearly incompressible polymer resisting the volume change within the honeycomb cells. HPC samples were fabricated using an aramid honeycomb, with either silicone or urethane rubber as the matrix materials to fill the honeycomb. Varying polymer stiffness, honeycomb geometry, and testing temperature were all tested to observe the effects on the material properties. The results indicated that the HPCs could be effectively tailored and modeled to suit the need for different effective moduli. This research provides important insight and results in the development of programmable honeycomb polymer composites (PHPCs), which rely on shape memory polymers (SMP) as the internal working polymer.

scholarly journals Effect of addition of different reinforcements on the microstructure and mechanical characterization of the Al-Flyash composites

2021 ◽  
Vol 15 (56) ◽  
pp. 217-228
Author(s):  
Milind K. Wasekar ◽  
Mohan P. Khond
Keyword(s):  
Tensile Strength ◽  
Hybrid Composites ◽  
Tensile Tests ◽  
Stir Casting ◽  
Interface Bonding ◽  
Casting Technique ◽  
Testing Procedures ◽  
The Matrix ◽  
Aluminum 6061 Alloy

The aim of this work is to investigate the influence of the addition of silicon carbide and molybdenum disulfide on the microstructure and the tensile strength of the Al-Flyash hybrid composites prepared using the stir casting technique. The composite with aluminum 6061 alloy as the matrix and flyash as the reinforcement, with different weight fractions, is investigated to study its microstructure and the tensile strength. The same has been compared with the hybrid composites with Aluminum-Flyash/SiC and Aluminum-Flyash/MoS2 for different weight fractions of the reinforcements. The tensile tests were conducted as per ASTM standard testing procedures at room temperature. From the results it is identified that tensile strength of the Al6061-Flyash composite is lesser than the Al6061-Flyash/SiC and Al6061-Flyash/MoS2 hybrid composites. It is also observed that increment in the composition of the SiC and MoS2 causes the increment in the tensile strength of the hybrid composite. This increment in the tensile strength is due to good interface bonding and uniform distribution of the reinforcements in the composite.

Preparation and Characterization of Hybrid Aluminum Matrix Composites Reinforced with MWCNT Using Powder Metallurgy Process

2015 ◽  
Vol 813-814 ◽  
pp. 620-624
Author(s):  
S. Dhandapani ◽  
T. Rajmohan ◽  
K. Palanikumar ◽  
Charan Mugunthan
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Metal Matrix ◽  
Matrix Material ◽  
Aluminum Matrix ◽  
Nano Particles ◽  
Aluminum Matrix Composites ◽  
The Matrix ◽  
Carbon Nano Tubes

Metal Matrix Nano Composites (MMNC) consist of a metal matrix reinforced with nano-particles featuring physical and mechanical properties very different from those of the matrix. Especially carbon Nano tubes (CNT) can improve the matrix material in terms of wear resistance, damping properties and mechanical strength. The present investigation deals with the synthesis and characterization of aluminium matrix reinforced with micro B4C particles, and Multi Wall Carbon nano Tubes (MWCNT) were prepared by powder metallurgy route. Powder mixture containing fixed weight (%) of B4C and different wt% of MWCNT as reinforcement constituents that are uniaxial cold pressed and later green compacts are sintered in continues electric furnace. Microstructure and Mechanical properties such as micro hardness and density are examined. Micro structure of samples has been investigated using scanning electron microscope (SEM) .The results indicated that the increase in wt % of MWCNT improves the bonding and mechanical properties.

An Alternative Approach for FRCM Matrix Tensile Strength Evaluation

2019 ◽  
Vol 817 ◽  
pp. 365-370 ◽  
Author(s):  
Alessandro Bellini ◽  
Marco Bovo ◽  
Andrea Incerti ◽  
Claudio Mazzotti
Keyword(s):  
Tensile Strength ◽  
High Performance ◽  
Mechanical Characterization ◽  
Experimental Tests ◽  
Tensile Tests ◽  
Test Methods ◽  
Test Method ◽  
The Matrix ◽  
Flexural Tests

Structural retrofitting with composite materials proved to be an effective technique for rehabilitation of degraded or damaged masonry and concrete buildings. Nowadays, Fiber Reinforced Cementitious Matrix (FRCM) composites are widely used as externally bonded strengthening systems thanks to their high performance, low weight and easiness of installation. Several experimental tests and numerical studies are currently available concerning the tensile and bond behavior of FRCM systems, but a debated and still open issue concerns the methods for the mechanical characterization of the mortar used as matrix within the strengthening system. The present paper analyses and compares different test methods for determining the matrix tensile strength. Pure tensile and flexural tests have been carried out on different mortar matrix samples. In order to evaluate which is the most suitable value to be considered for a correct interpretation and modeling of the composite system, the experimental results obtained through flexural tests on standard mortar specimens have been compared with the outcomes obtained from direct tensile tests on FRCM coupons. The present study represents only a first step for the definition of the most appropriate test method for the mechanical characterization of the matrix used within FRCM strengthening systems.

Effect of Crack Formation under Elongation in Carbon Nanotube Networks Embedded in Polyurethane

2014 ◽  
Vol 605 ◽  
pp. 231-234
Author(s):  
Petr Slobodian ◽  
Pavel Riha ◽  
Ruhan Benlikaya ◽  
Robert Olejnik
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Resistance ◽  
Structural Changes ◽  
Crack Formation ◽  
High Strain ◽  
Tensile Deformation ◽  
Strain Sensing ◽  
Resistance Change ◽  
Electrically Conductive ◽  
Carbon Nanotube Networks

A highly deformable composite composed of a network of electrically-conductive entangled carbon nanotubes embedded in elastic polyurethane for sensing tensile deformation by changes in strain has been prepared. The testing has shown that the composite can be extended as by much as 400 % during which the electrical resistance increases more than 270 times. The high strain sensing can be attributed to the network cracking upon extension. To understand the cracking mechanism and explain the resistance change, the structural changes of networks made of pristine carbon nanotubes (as well as functionalized multi-walled) were examined. The microscopic observation of crack formation and resistance change of the networks correlates well with the amount of cracking.

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