Experimental Investigation on Modal Response of Woven Fabric Carbon Composite Plate Reinforced with Particles of Micro Rubber Blended Epoxy Matrix under Free Vibration Condition

2014 ◽  
Vol 984-985 ◽  
pp. 273-279 ◽  
Author(s):  
Chinnasamy Senthamaraikannan ◽  
S.K. Sarathkumar ◽  
Rajagopal Ramesh
Keyword(s):  
Epoxy Matrix ◽  
Composite Plate ◽  
Performance Test ◽  
Epoxy Composite ◽  
Rubber Particle ◽  
Carbon Composite ◽  
Vibration Damping ◽  
Vibration Characteristics ◽  
Woven Fabric ◽  
Rubber Particles

Vibration damping is proving important for improved vibration control and dynamic stability in advanced engineering systems like aerospace systems, automobiles and in ship building industry. In the present investigation, vibration characteristics of woven fabric carbon composite plate reinforced with micro rubber particle blended into epoxy matrix is studied for enhancing the vibration damping performance. Test Specimens are fabricated in the form of hand layup method. CTBN rubber particle size of 5μm is selected and added to the epoxy matrix for fabricating carbon/epoxy composite plates. Rubber particles of 3% & 15 % by weight were considered as blended percentage in epoxy matrix and compared with 0% addition of rubber particles for understanding and analyzing the vibration characteristics and its difference in damping performance. Vibration damping and modal responses of various kinds of prepared plates were studied and compared. Among tested samples, carbon/epoxy composite plate with 15 wt % micro rubber particle by weight showed very good damping performance.

Evaluation of mechanical and vibration behavior of hybrid epoxy carbon composite beam carrying micron-sized CTBN rubber and nanosilica particles

2018 ◽  
Vol 233 (9) ◽  
pp. 1738-1752
Author(s):  
C Senthamaraikannan ◽  
R Ramesh
Keyword(s):  
Free Vibration ◽  
Frequency Response ◽  
Response Function ◽  
Epoxy Matrix ◽  
Composite Beam ◽  
Frequency Response Function ◽  
Secondary Reinforcement ◽  
Carbon Composite ◽  
Composite Beams ◽  
Rubber Particles

The suppression of vibration in dynamic structures is considered as one of the important functional requirements. In the present investigation, the free vibration behaviour of the woven carbon-epoxy composite beams was studied by blending nanosilica and micro-sized carboxyl-terminated butadiene acrilonitrile copolymer CTBN rubber in an epoxy matrix. The basic I and channel shapes widely used in structural applications were considered for fabrication of composite beams and made by hand layup method. The hybrid specimens were prepared by keeping 9% rubber particles by weight as stable primary ingredients in epoxy and the secondary reinforcement nanosilica was added by varying the weight fraction of 6% and 11%. The mechanical behaviour study and free vibration test were conducted as per ASTM standards and compared between virgin and hybrid composites. The addition of nanosilica, as secondary reinforcement in an epoxy matrix improves the mechanical properties of CTBN rubber-blended carbon composites. The structural beams were tested by impulse frequency response method under cantilever boundary conditions. Frequency response function plots were recorded and compared for all considered beam samples. The decreased amplitude response observed in frequency response function plot for micro rubber added samples of 9 wt%, indicate enhanced passive damping characteristics. The nanosilica, along with the micro rubber particles, shows improved passive damping capacity than virgin carbon composite beam. Finite element modelling of the composite beam was done for modal response using ANSYS® application software. Mode shapes and corresponding modal frequency of all types of beams have been compared and discussed.

Study of Free Vibration Characteristics of Carbon Epoxy Based Composite Beams

2015 ◽  
Vol 813-814 ◽  
pp. 1042-1046
Author(s):  
Rajagopal Ramesh ◽  
Siddharth Balasubramanian ◽  
Chinnasamy Senthamaraikannan
Keyword(s):  
Free Vibration ◽  
Volume Fraction ◽  
Rubber Particle ◽  
Weight Ratio ◽  
Vibration Characteristics ◽  
Woven Fabric ◽  
Mode Shapes ◽  
Carbon Composites ◽  
Impulse Frequency ◽  
Resonance Frequencies

Carbon fibers find their application in lightweight structures due to high strength to weight ratio. Passive damping is proving important for vibration control and dynamic stability in advanced engineering systems like aerospace, automobiles and in ship building industry. In the present investigation, Mechanical properties and free vibration characteristics of woven fabric carbon composites were studied by adding micro rubber alone as reinforcement and combination of micro rubber and nanosilica particles as other reinforcements in epoxy matrix. Carbon composites were prepared with two different epoxy matrices containing 9 wt. % micro rubber particle and 6wt. % nanosilica and 9 wt. % micro rubber particles as another combination. To study the influence of cross sectional shapes on vibration behavior of beams, most widely used structural shapes like I, Box and Channel section were chosen. Beams were fabricated with woven carbon fabric and epoxy resin by hand layup technique by maintaining 40 % fiber volume fraction and 60 % matrix volume fraction for all epoxy combinations. Mechanical behavior of modified carbon composites were studied by conducting tests as prescribed by ASTM standards. Vibration damping behavior was studied by subjecting fabricated beams to Impulse frequency response test under cantilever end boundary conditions. It was found that the hybrid carbon epoxy beams with 6% nanoSilica and 9% Micro Rubber by weight showed better damping performance for successive resonance frequencies. Modal responses of all beams like mode shapes and their corresponding natural frequencies were extracted using MEScopeVES® software and discussed.

scholarly journals Instability Analysis of a Woven Fibre Composite Plate

2019 ◽  
Vol 8 (4) ◽  
pp. 2449-2454
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Free Vibration ◽  
Epoxy Matrix ◽  
Composite Plate ◽  
Fibre Composite ◽  
Buckling Analysis ◽  
Instability Analysis ◽  
Critical Buckling Load ◽  
Modal Response

The instability behaviour of a woven fibre composite plate in respect of its free vibration and buckling analysis has been presented in this paper. The woven fibre composite plate has been prepared by hand layup with bidirectional woven glass fibres in epoxy matrix. The mechanical properties of the woven fibre composite plate have been characterised experimentally and a finite element investigation has been done for the instability analysis. Modal response of the plate and the critical buckling load leading to instability of the plate to varying parameters are studied and numerical results have been presented.

scholarly journals Study on Initial Failure in Tension of Glass Woven Fabric/Epoxy Composite with Functional Interphase

2004 ◽  
Vol 30 (1) ◽  
pp. 16-23
Author(s):  
Kenichi SUGIMOTO ◽  
Toshiko OSADA ◽  
Nobuyoshi KAJIOKA ◽  
Asami NAKAI ◽  
Hiroyuki HAMADA
Keyword(s):  
Epoxy Composite ◽  
Woven Fabric ◽  
Initial Failure

Research on Modifier and Modified Process for Rubber-Particle Used in Rubberized Concrete for Road

2011 ◽  
Vol 243-249 ◽  
pp. 4125-4130 ◽  
Author(s):  
Shuai Tian ◽  
Tong Zhang ◽  
Ye Li
Keyword(s):  
Inorganic Salt ◽  
Rubber Particle ◽  
Volume Ratio ◽  
Alkaline Solutions ◽  
Rubberized Concrete ◽  
Function Mechanism ◽  
Mix Proportion ◽  
Optimum Proportion ◽  
Rubber Particles ◽  
The Impact

This paper studies the optimum proportion of rubber-particles in rubberized concrete for road, tests the impact of 12 modifiers and their modified processes in rubberized concrete and discusses the function mechanism of the modifiers in rubberized concrete. Research indicates: the optimum proportion of rubber-particles in rubberized concrete for road is low mix-proportion (volume ratio<5%); inorganic salt as modifier can markedly enhance the bonding strength between rubber-particles used in road and cement and improve the physical properties of rubberized concrete, among which CaCl2 produces the most effect; but organic solution, acidic or alkaline solutions are not fit to be used as modifiers in rubberized concrete for road.

Influence of Rubber Particle Size on Functional Properties of a Composite Material Based on Scrap Tires and a Polymer Binder

2020 ◽  
Vol 850 ◽  
pp. 107-111
Author(s):  
Laimonis Mālers ◽  
Agnija Cirvele
Keyword(s):  
Particle Size ◽  
Composite Material ◽  
Functional Properties ◽  
Material Properties ◽  
Rubber Particle ◽  
Polymer Binder ◽  
Scrap Tires ◽  
Elongation At Break ◽  
Rubber Particles ◽  
Purposeful Selection

Functional properties of composite material based on mechanically grinded scrap tires with different particle size of fractioned crumb and polyurethane type polymer binder were investigated to estimate influence of rubber particles size and content on composite material properties (Shore C hardness, compressive stress at 10 % deformation, tensile strength, elastic modulus and elongation at break, apparent density). Optimization possibilities of composite material consisting of rubber particles with different sizes or fractions were investigated. The obtained results show that variation of composition of the composite material by changing size of rubber granulate have definite influence on selected properties of the material. Purposeful selection and mutual combination of rubber particles size included in material can ensure desirable and predictable mechanical properties of composite material.

Fracture behavior and deformation mechanisms of polypropylene/ethylene-propylene-diene blends

2016 ◽  
Vol 36 (7) ◽  
pp. 695-704 ◽  
Author(s):  
Yuhui Ao ◽  
Fang Feng ◽  
Huixuan Zhang
Keyword(s):  
Electron Microscopy ◽  
Deformation Mechanism ◽  
Fracture Behavior ◽  
Rubber Particle ◽  
Shear Yielding ◽  
Ethylene Propylene ◽  
Transmission Electron ◽  
Rubber Particles ◽  
The Matrix ◽  
Matrix Shear

Abstract The fracture behavior and deformation mechanism of polypropylene (PP)/ethylene-propylene-diene rubber (EPDM) were studied by scanning electron microscopy and transmission electron microscopy analyses. The deformation mechanism was investigated under different conditions. Voids were seen under all the conditions because of matrix shear yielding, indicating that rubber particle cavitation took place during the blend fracture process; moreover, the void size and density increased as the fracture surface was approached. However, the void density and extent of elongation of the rubber particles in the deformation zone decreased with increasing test speed rate. Many voids were positioned in the rubber particles, confirming that matrix shear yielding initiated by rubber particle cavitation was the main deformation mechanism during ductile fracture in the matrix.

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