Study of Damping Properties of Polymer Matrix Composites Through Wave Propagation

2017 ◽  
Author(s):  
Shank S. Kulkarni ◽  
Alireza Tabarraei
Keyword(s):  
Polymer Composites ◽  
Vibrational Frequency ◽  
Volume Fraction ◽  
Polymer Matrix Composites ◽  
Matrix Composites ◽  
Damping Properties ◽  
Viscoelastic Matrix ◽  
Spherical Inclusions ◽  
Tan Δ ◽  
Damping Capability

We conduct a stochastic analysis to investigate the damping properties of polymer composites with viscoelastic matrix and elastic spherical inclusions. Since damping capability of polymer composites is directly related to the ratio of loss to storage modulus known as tan δ, we use computational homogenization techniques to investigate the effect of vibrational frequency, size and volume fraction of inclusions on tan δ. Our results show that tan δ is highly dependent on the frequency of vibrations as well as the volume fraction of inclusions. Our numerical analyses also show that tan δ is not sensitive to the size of inclusions as long as inclusions volume fraction remains the same.

Investigation Stress-Strain Behaviors of Glass/Polymer Composites

2013 ◽  
Vol 774-776 ◽  
pp. 775-778
Author(s):  
Jun Jie Ye ◽  
Da Peng Li ◽  
Xiao Hui Han ◽  
Bao Jia Chen
Keyword(s):  
Strain Rate ◽  
Polymer Composites ◽  
Volume Fraction ◽  
Polymer Matrix Composites ◽  
Micromechanical Model ◽  
Matrix Composites ◽  
Fiber Volume ◽  
Stress Strain ◽  
Nonlinear Mechanical ◽  
Nonlinear Behaviors

In this paper, a micromechanical model based on Generalized Method of Cells(GMC) for predicting stress-strain behaviors of polymer-matrix composites is presented. Improved Bodner-Partom viscoplastic model is incorporated into GMC to describe nonlinear mechanical behavior of composites. On this basis, strain rate and fiber volume fraction(FVF) influence on nonlinear behaviors of composites are discussed. The results show that strain rate influences on stress-strain behaviors of composites in inelastic region can be clearly discerned. Moreover, FVF tends to clearly increase stiffness behaviors of polymer-composites.

Quality Improvement of CNT by Thermal Treatment and Enhancement of Properties of CNT/Polymer Composites

2018 ◽  
Vol 772 ◽  
pp. 23-27
Author(s):  
Takashi Amemiya ◽  
Toshiyuki Yasuhara
Keyword(s):  
Polymer Composites ◽  
Mechanical Characteristics ◽  
Polymer Matrix Composites ◽  
Lower Surface ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Matrix Composites ◽  
High Quality ◽  
Heat Treated ◽  
Double Wall

Since CNTs (carbon nanotubes) have excellent electrical and mechanical characteristics, their application as fillers for polymer matrix composites is expected to have great potential. The purpose of this study is to clarify the effect of CNT’s crystallinity quality, which is given by high temperature treatment (i.e. annealing), on the properties of CNT/polymer composites. In this study, double wall type CNT (DWNT) and multi wall type CNT (MWNT) were used and heat treated at up to 2000°C to achieve highly improved crystallinity. Electrical and mechanical properties of the CNT/polymer composites were compared with the various CNT’s crystallinity qualities as measured by ID/IG ratios. As a result, although the composites with higher quality CNTs showed considerably lower surface resistivities, however the same composites had lower Young's modulus and tensile strengths. The reason is thought to be that the high quality CNT has low surface activity and weak adhesion between the polymer and the CNT surface. This suggests that CNTs with higher quality do not always contribute to the improvement to the properties of CNT/polymer composites.

Influence of filler on erosion behavior of polymer composites: A comprehensive review

2018 ◽  
Vol 37 (15) ◽  
pp. 1011-1019 ◽  
Author(s):  
S Vigneshwaran ◽  
M Uthayakumar ◽  
V Arumugaprabu ◽  
R Deepak Joel Johnson
Keyword(s):  
Polymer Composites ◽  
Polymer Matrix ◽  
Erosion Resistance ◽  
Polymer Matrix Composites ◽  
Research Work ◽  
Recent Decade ◽  
Extensive Study ◽  
Filler Materials ◽  
Matrix Composites ◽  
Filled Composite

In recent decade, polymer matrix composites were extensively used in various engineering applications owing to their advanced properties over conventional materials and enhanced performance. This motivated the researchers to generate an extensive study and research work on polymer composites. In recent studies, the erosion properties of the polymer composite attract increasing attention among researchers. The potential enhancement in the erosion resistance property of filled composites tempted the researchers to find the feasibility of using various filler materials in polymer matrix for specific erosion resistance applications. However, only limited numbers of literature are available concerning the tribological performance of the filled composite. Hence in this study, an objective was set to review the various literature that explain the erosion characteristics of filled composites.

Evaluation of the properties of polymer composites with carbon nanotubes in the aspect of their abrasive wear

2019 ◽  
Vol 1 (95) ◽  
pp. 5-12 ◽  
Author(s):  
A. Krzyżak ◽  
E. Kosicka ◽  
R. Szczepaniak ◽  
T. Szymczak
Keyword(s):  
Carbon Nanotubes ◽  
Composite Materials ◽  
Bisphenol A ◽  
Abrasive Wear ◽  
Polymer Composites ◽  
Tribological Properties ◽  
Polymer Matrix Composites ◽  
Matrix Composites ◽  
Friction Modifier ◽  
The Impact

Purpose: Carbon nanotubes are used in composite materials due to the improvement of (including tribological) properties of composites, especially thermoplastic matrix composites. This demonstrates the potential of CNTs and the validity of research on determining the impact of this type of reinforcement on the composite materials under development. Design/methodology/approach: The article presents selected results of research on polymer composites made of C.E.S. R70 resin, C.E.S. H72 hardener with the addition of a physical friction modifier (CNTs) with a percentage by volume of 18.16% and 24.42%, respectively, which also acts as a reinforcement. The produced material was subjected to hardness measurements according to the Shore method and EDS analysis. The study of abrasive wear in reciprocating movement was carried out using the Taber Linear Abraser model 5750 tribotester and a precision weight. The surface topography of the composite material after tribological tests was determined using scanning electron microscopy (SEM). Some of the mentioned tests were carried out on samples made only of resin, used as the matrix of the tested polymer composite. Findings: Carbon nanotubes used in polymer matrix composites, including bisphenol A/F epoxy resin have an influence on the tribological properties of the material. The addition of carbon nanotubes contributed to a 24% increase in the Ra parameter relative to pure resin, to a level corresponding to rough grinding of steel. Research limitations/implications: The results of the tests indicate the need to continue research in order to optimize the composition of composites in terms of operating parameters of friction nodes in broadly understood aviation. Originality/value: The analysed literature did not find any studies on the impact of the addition of carbon nanotubes on epoxy resins based on bisphenol A/F. Due to the wide scope of application of such resins, the properties of such composite materials in which carbon nanotubes are the reinforcing phase have been investigated.

Mechanical Properties of Densified Untwisted Carbon Nanotube Yarn / Epoxy Composites

2015 ◽  
Author(s):  
Risa Yoshizaki ◽  
Kim Tae Sung ◽  
Atsushi Hosoi ◽  
Hiroyuki Kawada
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Polymer Matrix Composites ◽  
High Strength ◽  
Matrix Composites ◽  
Specific Strength ◽  
The Matrix ◽  
Cnt Arrays ◽  
Strength And Stiffness ◽  
Long Fibers

Carbon nanotubes (CNTs) have very high specific strength and stiffness. The excellent properties make it possible to enhance the mechanical properties of polymer matrix composites. However, it is difficult to use CNTs as the reinforcement of long fibers because of the limitation of CNT growth. In recent years, a method to spin yarns from CNT forests has developed. We have succeeded in manufacturing the unidirectional composites reinforced with the densified untwisted CNT yarns. The untwisted CNT yarns have been manufactured by drawing CNTs through a die from vertically aligned CNT arrays. In this study, the densified untwisted CNT yarns with a polymer treatment were fabricated. The tensile strength and the elastic modulus of the yarns were improved significantly by the treatment, and they were 1.9 GPa and 140 GPa, respectively. Moreover, the polymer treatment prevented the CNT yarns from swelling due to impregnation of the matrix resin. Finally, the high strength CNT yarn composites which have higher volume fraction than a conventional method were successfully fabricated.

scholarly journals Pengaruh Sintering Serbuk Batuan Basalt sebagai Bahan Penguat pada Komposit Polyester terhadap Sifat Fisik dan Mekanik

2021 ◽  
Vol 12 (2) ◽  
pp. 391-399
Author(s):  
Yusup Hendronursito ◽  
◽  
Asep Andri Saputra ◽  
Tumpal Ojahan Rajaguguk ◽  
Slamet Sumardi ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Physical Properties ◽  
Volume Fraction ◽  
Polymer Matrix Composites ◽  
Sintering Temperature ◽  
Construction Material ◽  
Matrix Composites ◽  
Rock Powder ◽  
Mechanical And Physical Properties ◽  
Basalt Rock

Basalt rock has great potential in Lampung Province but is only used as a building construction material. Basalt has superior characteristics such as abrasion/wear resistance, compressive strength and chemical reaction resistance making it suitable as a filler or reinforcement for composites. This study aims to determine the effect of basalt rock powder sintering as a reinforcing filler on the mechanical and physical properties of polymer matrix composites. The parameters used included variations in sintering temperature: 8500C, 9500C, and 1.0500C, variations in particle size: 100 < X < 150 mesh, 150 < Y < 200 mesh and 200 < Z < 270 mesh, and the volume fraction comparison of basalt sintering powder and polyester resin. 70: 30%, 80: 20%, and 90: 10%. The experimental design uses the L9 3^3 taguchi orthogonal array run 9 specimens. Taguchi analysis shows that the parameters that affect the mechanical and physical properties are the sintering temperature. sintering temperature contributed 61.77% to wear, and 87.58% to compressive strength, and 95.32% to composite density. The experimental results with the best value obtained a wear value of 0.235 x 10-7mm2 / kg, a compressive strength of 118.873 MPa, and a density of 2.272 gr/cm3.

scholarly journals Review of Polymer Composites with Diverse Nanofillers for Electromagnetic Interference Shielding

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 541 ◽  
Author(s):  
Dimuthu Wanasinghe ◽  
Farhad Aslani ◽  
Guowei Ma ◽  
Daryoush Habibi
Keyword(s):  
Electrical Conductivity ◽  
Polymer Composites ◽  
Polymer Matrix ◽  
Electromagnetic Interference ◽  
Polymer Matrix Composites ◽  
Morphological Properties ◽  
Matrix Composites ◽  
Emi Shielding ◽  
Alternative Materials ◽  
Metallic Panels

Polymer matrix composites have generated a great deal of attention in recent decades in various fields due to numerous advantages polymer offer. The advancement of technology has led to stringent requirements in shielding materials as more and more electronic devices are known to cause electromagnetic interference (EMI) in other devices. The drive to fabricate alternative materials is generated by the shortcomings of the existing metallic panels. While polymers are more economical, easy to fabricate, and corrosion resistant, they are known to be inherent electrical insulators. Since high electrical conductivity is a sought after property of EMI shielding materials, polymers with fillers to increase their electrical conductivity are commonly investigated for EMI shielding. Recently, composites with nanofillers also have attracted attention due to the superior properties they provide compared to their micro counterparts. In this review polymer composites with various types of fillers have been analysed to assess the EMI shielding properties generated by each. Apart from the properties, the manufacturing processes and morphological properties of composites have been analysed in this review to find the best polymer matrix composites for EMI shielding.

scholarly journals Enhancement of Electrical Conductivity of Polyaniline Synthesized by using Carbon Nanofiber

2021 ◽  
Vol 13 (1) ◽  
pp. 243-252
Author(s):  
M. M. Rahman ◽  
D. R. Sarker ◽  
M. M. Rahman ◽  
M. O. Faruk
Keyword(s):  
Electrical Conductivity ◽  
Polymer Composites ◽  
Electrode Materials ◽  
Carbon Nanofiber ◽  
Polymer Matrix Composites ◽  
Oxidative Polymerization ◽  
Matrix Composites ◽  
Aniline Monomer ◽  
Electrically Conducting ◽  
Application Fields

Carbon nanofiber (CNF) is a very useful additive for improving the performance of polymer matrix composites, but the performance has sometimes been interrupted by limits appear within composite processing. Recently, CNF based polymer composites are intensely considered as promising materials in many application fields, such as electrical devices, electrode materials for batteries, supercapacitors, sensors, etc. Among these, the electrical conductivity is always the first priority need to be considered. Polyaniline (PANI) and PANI-CNF composites are synthesized by chemical oxidative polymerization of aniline monomers in acidic media. The electrical conductivity of PANI-CNF composites were found varies with the degree of amount of CNF under the effect of multiple factors such as the concentration of aniline monomer, reaction media, oxidant, reaction temperature, reaction time, etc. The maximum electrical conductivity was found 3.7131 S/cm of the PANI-CNF composite coming from the polymerization of aniline with 0.05 g CNF. The results of the synthesis also demonstrated that CNF can be an effective material to prepare electrically conducting polymer composites with ordered nanostructures.

Failure of Composites Under Combined Loading

2001 ◽  
Author(s):  
Chandra S. Yerramalli ◽  
Anthony M. Waas
Keyword(s):  
Compression Strength ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Polymer Matrix Composites ◽  
Combined Loading ◽  
Carbon Composites ◽  
Matrix Composites ◽  
Fiber Volume ◽  
Glass Composites ◽  
Glass Fiber Composites

Abstract The response of polymer matrix composites under combined proportional axial and torsional loading has been studied. Experiments were performed on solid cylindrical specimens of glass/vinylester and carbon/vinylester composites at a fiber volume fraction, Vf equal to 50%. The specimens were loaded under displacement and rotation control in a proportional manner. The Budiansky-Fleck kinking model was specialized to the case of a solid cylindrical specimen and the predictions were compared to the experimental results. It was found that the compression strength of carbon composites is approximately a linear function of the applied rotation but in the case of glass composites the compression strength is initially unaffected due to shear. At a critical value of shear, the compression strength is seen to diminish rapidly. This suggests that the Budiansky-Fleck model might not be suitable for predicting the effect of shear on compression strength of glass fiber composites.

scholarly journals Frozen Stresses in Shape Memory Polymer Composites

2018 ◽  
Vol 55 (4) ◽  
pp. 494-497
Author(s):  
Giovanni Matteo Tedde ◽  
Loredana Santo ◽  
Denise Bellisario ◽  
Leandro Iorio ◽  
Fabrizio Quadrini
Keyword(s):  
Shape Memory ◽  
Polymer Composites ◽  
Smart Materials ◽  
Polymer Matrix Composites ◽  
Shape Memory Polymer ◽  
Shape Memory Polymers ◽  
Experimental Tests ◽  
Matrix Composites ◽  
Flexural Test ◽  
Functional Behavior

Shape Memory Polymer Composites (SMPCs) are a class of smart materials in which the structural properties of long-fiber polymer-matrix composites and the functional behavior of Shape Memory Polymers (SMP) are combined together. In this study, the frozen stresses resulting from fixing a deformed shape have been investigated. Two different samples were manufactured, with and without significant shape memory properties, and a three point flexural test equipment was used in order to fix a deformed shape. The forces and the resulting stresses were measured during the samples deformation and after the shape freezing. The experimental tests have shown that the shape memory sample has a better ability to fix a deformed shape, since its frozen stress is higher in all the tests.

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