In this work, Diglycidyl Ether of BisphenolA(DGEBA) / TriEthylene Tetra Amine(TETA) system is used as the epoxy matrix and unidirectional glass fabric is used to reinforce with the polymer matrix by hand layup and vacuum bagging process. The glass fibre reinforced composites are prepared with fibre orientations of 0°, 45° and 90°. The specimens, after preparation, are tested for various tensile properties at different angles of the laminate. The tensile properties studied in this case are Tensile Strength, Tensile Modulus, Specific Tensile Strength and Specific Tensile Modulus. The result shave then been tabulated and studied to understand variation in the properties with orientation of fibre in the composite. Experimental procedure is carried out as per ASTM D3039 standards.
Influence of Carbon & Glass Fiber Reinforcements on Flexural Strength of Epox...IJERA Editor
Hybrid composite materials are more attracted by the engineers because of their properties like stiffness and high specific strength which leads to the potential application in the area of aerospace, marine and automobile sectors. In the present investigation, the flexural strength and flexural modulus of carbon and glass fibers reinforced epoxy hybrid composites were studied. The vacuum bagging technique was adopted for the fabrication of polymer hybrid composite materials. The hardness, flexural strength and flexural modulus of the hybrid composites were determined as per ASTM standards. The hardness, flexural strength and flexural modulus were improved as the fiber reinforcement contents increased in the epoxy matrix material.
Static Analysis of Single Lap Joint of Composite Materialsijsrd.com
Mechanically fastened joints are critical parts in composite aircraft structures. The composite structural members are highly used in the following applications such as aerospace, automobiles, marine, architecture etc., In the past decades, adhesive bonding is a practical joint method for joining composite materials which provide low shear and tensile strength .To improve the tensile strength, the joint is made with material joint. Glass Fiber/Chopped strands mat and Bi-Directional fly / Epoxy composite is fabricated by hand lay-up method. The tensile properties of the material joint are obtained and compared with that of bolted joint. The experimental results shows that the material joint has superior tensile properties than the bolted joint and the Bi-Directional fly composite exhibits superior tensile strength than the chopped strands mat. Finite element analysis also done and compared with the experimental results and found to be similar.
Mechanical Properties of Tere-Phthalic Unsaturated Polyester Resin Reinforced...IOSR Journals
Abstract: The objective of this work is to investigate the mechanical properties of particulate snail shell
reinforced unsaturated polyester composite. 5wt% ground snail shell of particle size 625microns was
introduced to unsaturated polyester matrix to produce a composite. Other specimens were produced at 10, 15,
20, 25 and 30 weight percentages of the particulate filler in unsaturated polyester matrix. Mechanical tests were
conducted on prepared samples of the composite material. The results showed that the flexural strength of the
composite with 20wt% snail shell particulate reinforcement was greatly enhanced and the impact and hardness
properties were greatly improved at 5wt% filler loading. The composite could be considered for applications in
areas where high impact strength is a requirement such as in shipping containers. The 20wt% snail shell
reinforced unsaturated polyester can be used in place of pure polyester for applications where flexibility is of
utmost importance. Keywords: Snail Shell, Unsaturated Polyester, Composite, Mechanical Properties, filler
Influence of Carbon & Glass Fiber Reinforcements on Flexural Strength of Epox...IJERA Editor
Hybrid composite materials are more attracted by the engineers because of their properties like stiffness and high specific strength which leads to the potential application in the area of aerospace, marine and automobile sectors. In the present investigation, the flexural strength and flexural modulus of carbon and glass fibers reinforced epoxy hybrid composites were studied. The vacuum bagging technique was adopted for the fabrication of polymer hybrid composite materials. The hardness, flexural strength and flexural modulus of the hybrid composites were determined as per ASTM standards. The hardness, flexural strength and flexural modulus were improved as the fiber reinforcement contents increased in the epoxy matrix material.
Static Analysis of Single Lap Joint of Composite Materialsijsrd.com
Mechanically fastened joints are critical parts in composite aircraft structures. The composite structural members are highly used in the following applications such as aerospace, automobiles, marine, architecture etc., In the past decades, adhesive bonding is a practical joint method for joining composite materials which provide low shear and tensile strength .To improve the tensile strength, the joint is made with material joint. Glass Fiber/Chopped strands mat and Bi-Directional fly / Epoxy composite is fabricated by hand lay-up method. The tensile properties of the material joint are obtained and compared with that of bolted joint. The experimental results shows that the material joint has superior tensile properties than the bolted joint and the Bi-Directional fly composite exhibits superior tensile strength than the chopped strands mat. Finite element analysis also done and compared with the experimental results and found to be similar.
Mechanical Properties of Tere-Phthalic Unsaturated Polyester Resin Reinforced...IOSR Journals
Abstract: The objective of this work is to investigate the mechanical properties of particulate snail shell
reinforced unsaturated polyester composite. 5wt% ground snail shell of particle size 625microns was
introduced to unsaturated polyester matrix to produce a composite. Other specimens were produced at 10, 15,
20, 25 and 30 weight percentages of the particulate filler in unsaturated polyester matrix. Mechanical tests were
conducted on prepared samples of the composite material. The results showed that the flexural strength of the
composite with 20wt% snail shell particulate reinforcement was greatly enhanced and the impact and hardness
properties were greatly improved at 5wt% filler loading. The composite could be considered for applications in
areas where high impact strength is a requirement such as in shipping containers. The 20wt% snail shell
reinforced unsaturated polyester can be used in place of pure polyester for applications where flexibility is of
utmost importance. Keywords: Snail Shell, Unsaturated Polyester, Composite, Mechanical Properties, filler
Effect of stacking sequence and hybridization on the tensile and flexural properties of composite
laminates between basalt, jute and flax with E-glass reinforced epoxy have been investigated experimentally. It
was found that stacking sequence is not highly significant on tensile properties, contrasting with flexural strength
and modulus which were strongly dependent on the hybrid configuration between sandwich-like (SL) and
intercalation (IC) sequences. Specific modulus based on the variation densities of the hybrid laminates was used
to discover the best combination either basalt, jute or flax with E-glass exhibits superior properties concerning
on the strength to weight- ratio. Hence, stacking sequences and material selection are among predominant factors
that influence on mechanical properties and very crucial in designing composite hybrid system to meet the desired
requirements.
Investigation of Tribological Behaviour of GF Filled Peek Composite under the...IJERA Editor
Composite materials have successfully substituted the traditional materials in several light weight and high
strength applications. The reasons why composites are selected for such applications are mainly their high
strength-to-weight ratio, high tensile strength at elevated temperatures, high creep resistance and high
toughness. Therefore minimum Wear of component or part used in machinery is very important factor for the
industry. In this paper the tribological behavior of PEEK (Poly-ether-ether-ketone) composites reinforced by
30% short glass fiber and phosphor bronze were comparatively evaluated on Pin on disc machine. The effect of
three parameters such as temperature, load and sliding distance on Wear loss of PEEK composites reinforced by
30% short glass fiber and phosphor bronze were examined. The detailed mathematical model is simulated by
Minitab 17 and simulation results fit experiment data very well
In this investigation, an effective approach based on Taguchi method, analysis of variance (ANOVA),
multivariable linear regression (MVLR), has been developed to determine the optimum conditions leading to
minimum Wear. Experiments were conducted by varying temperature, load and sliding distance using L9
orthogonal array of Taguchi method. The present work aims at optimizing process parameters to achieve
minimum Wear. Experimental results from the orthogonal array were used as the training data for the MVLR
model to map the relationship between process parameters and Wear. The experiment was conducted on
computerized Pin on Disc machine. It was observed that PEEK 30% Glass Fiber Composite Polymer has
excellent wear resistance compare to Phosphor bronze at elevated temperature.
Vibrations and fatigue- vibration interactions of laminated composites.Padmanabhan Krishnan
This slide show describes the vibrations and fatigue vibrations characteristics of laminated composites like glass/epoxy, carbon/epoxy and their hybrids.
The roles of process parameters on structures and mechanical properties of po...Bambang Afrinaldi
Process parameters are crucial to produce targeted qualities in polypropylene (PP)/clay nanocomposites, due to their roles on the generation of shear and diffusion. Thus, this research aims to observe their effects on structures and properties of PP/clay nanocomposites. Samples were produced by mixing PP, PP grafting maleic anhydride (PP-gMA), and Cloisite 20A at fixed compositions, 88/9/3 wt%, respectively, in an internal mixer with variations on temperatures (210, 220, 230 °C) and speeds (60, 80, 100 rpm). Effect of mixing parameters on nanocomposite structures and properties were investigated from XRD, SEM and flexural properties. The results showed that all samples had intercalated as well as agglomerated structures. Further analysis on XRD and SEM showed that samples produced at
high conditions (230C or 100 rpm) had similar structures. In contrast, low setting sample (210C and 60 rpm), despite its similarity on dispersion level, had longer agglomerates than that of mixed at high settings. Correlated both increase of d-spacing and agglomerates length to flexural properties suggested that modulus was more influenced by dispersion level, while strength
was affected by agglomerates. However, it was worth to note that improvement on dspacing, with availability of long agglomerates might not guarantee modulus and strength improvement due to low interfacial bonding.
Effect of Nanoparticles on E-Glass Fiber Epoxy Resin CompositesIJMER
In the present work fabrication of composite material(E-Glass Fiber Epoxy Resin +
NANO CaCO3) was carried out and their tensile properties viz tensile strength, tensile
strain(%),young's modulus, energy at maximum load and brihnall hardness number were found.
Specimens of E-Glass Fiber Epoxy Resin) hybrid composites are prepared with four different
compositions of nano-calcium carbonate (CaCO3), viz., 0,3,5 and 7%.Each specimen consisting of
40%GF. The specimens are prepared by hand lay up method.. Tests are conducted on these specimens
to determine the tensile strength, tensile strain, young's modulus energy at maximum load and
hardness number at room temperature using universal testing machine and Brihnell hardness testing
machine. The influence of the nano-CaCO3 content on the mechanical properties tensile of hybrid
composites was studied. It is found that the reinforcing and toughening effects of the E-Glass epoxy
hybrid composites are increased by adding nano-CaCO3.The tensile strength, tensile strain, young’s
modulus and energy at max load of these composites increased nonlinearly with the addition of the
nano-CaCO3
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Dry Sliding Wear Behavior of Glass and Jute Fiber Hybrid Reinforced Epoxy Com...IJERD Editor
Glass Fiber reinforced composites are emerging as a potential material for a wide variety of
industrial applications owing to their good combination of physical and mechanical properties. In recent
decades, glass fiber composites parts are widely used as sliding components in different engineering
applications. Due to the legitimate theoretical and practical importance, the study of tribological performance of
these emerging materials becomes highly decisive. In the present research initiative, two type of reinforcements
are selected there are Glass and jute fibers with matrix of epoxy 551 was used for composite specimen
preparation. The frictional and wear characteristics of the developed composites have been studied under
different sliding conditions. From the results it is conclude that jute is more efficient in improving the
tribological Performance of glass-epoxy composites than the raw glass fiber reinforced epoxy composites.
Effect of stacking sequence and hybridization on the tensile and flexural properties of composite
laminates between basalt, jute and flax with E-glass reinforced epoxy have been investigated experimentally. It
was found that stacking sequence is not highly significant on tensile properties, contrasting with flexural strength
and modulus which were strongly dependent on the hybrid configuration between sandwich-like (SL) and
intercalation (IC) sequences. Specific modulus based on the variation densities of the hybrid laminates was used
to discover the best combination either basalt, jute or flax with E-glass exhibits superior properties concerning
on the strength to weight- ratio. Hence, stacking sequences and material selection are among predominant factors
that influence on mechanical properties and very crucial in designing composite hybrid system to meet the desired
requirements.
Investigation of Tribological Behaviour of GF Filled Peek Composite under the...IJERA Editor
Composite materials have successfully substituted the traditional materials in several light weight and high
strength applications. The reasons why composites are selected for such applications are mainly their high
strength-to-weight ratio, high tensile strength at elevated temperatures, high creep resistance and high
toughness. Therefore minimum Wear of component or part used in machinery is very important factor for the
industry. In this paper the tribological behavior of PEEK (Poly-ether-ether-ketone) composites reinforced by
30% short glass fiber and phosphor bronze were comparatively evaluated on Pin on disc machine. The effect of
three parameters such as temperature, load and sliding distance on Wear loss of PEEK composites reinforced by
30% short glass fiber and phosphor bronze were examined. The detailed mathematical model is simulated by
Minitab 17 and simulation results fit experiment data very well
In this investigation, an effective approach based on Taguchi method, analysis of variance (ANOVA),
multivariable linear regression (MVLR), has been developed to determine the optimum conditions leading to
minimum Wear. Experiments were conducted by varying temperature, load and sliding distance using L9
orthogonal array of Taguchi method. The present work aims at optimizing process parameters to achieve
minimum Wear. Experimental results from the orthogonal array were used as the training data for the MVLR
model to map the relationship between process parameters and Wear. The experiment was conducted on
computerized Pin on Disc machine. It was observed that PEEK 30% Glass Fiber Composite Polymer has
excellent wear resistance compare to Phosphor bronze at elevated temperature.
Vibrations and fatigue- vibration interactions of laminated composites.Padmanabhan Krishnan
This slide show describes the vibrations and fatigue vibrations characteristics of laminated composites like glass/epoxy, carbon/epoxy and their hybrids.
The roles of process parameters on structures and mechanical properties of po...Bambang Afrinaldi
Process parameters are crucial to produce targeted qualities in polypropylene (PP)/clay nanocomposites, due to their roles on the generation of shear and diffusion. Thus, this research aims to observe their effects on structures and properties of PP/clay nanocomposites. Samples were produced by mixing PP, PP grafting maleic anhydride (PP-gMA), and Cloisite 20A at fixed compositions, 88/9/3 wt%, respectively, in an internal mixer with variations on temperatures (210, 220, 230 °C) and speeds (60, 80, 100 rpm). Effect of mixing parameters on nanocomposite structures and properties were investigated from XRD, SEM and flexural properties. The results showed that all samples had intercalated as well as agglomerated structures. Further analysis on XRD and SEM showed that samples produced at
high conditions (230C or 100 rpm) had similar structures. In contrast, low setting sample (210C and 60 rpm), despite its similarity on dispersion level, had longer agglomerates than that of mixed at high settings. Correlated both increase of d-spacing and agglomerates length to flexural properties suggested that modulus was more influenced by dispersion level, while strength
was affected by agglomerates. However, it was worth to note that improvement on dspacing, with availability of long agglomerates might not guarantee modulus and strength improvement due to low interfacial bonding.
Effect of Nanoparticles on E-Glass Fiber Epoxy Resin CompositesIJMER
In the present work fabrication of composite material(E-Glass Fiber Epoxy Resin +
NANO CaCO3) was carried out and their tensile properties viz tensile strength, tensile
strain(%),young's modulus, energy at maximum load and brihnall hardness number were found.
Specimens of E-Glass Fiber Epoxy Resin) hybrid composites are prepared with four different
compositions of nano-calcium carbonate (CaCO3), viz., 0,3,5 and 7%.Each specimen consisting of
40%GF. The specimens are prepared by hand lay up method.. Tests are conducted on these specimens
to determine the tensile strength, tensile strain, young's modulus energy at maximum load and
hardness number at room temperature using universal testing machine and Brihnell hardness testing
machine. The influence of the nano-CaCO3 content on the mechanical properties tensile of hybrid
composites was studied. It is found that the reinforcing and toughening effects of the E-Glass epoxy
hybrid composites are increased by adding nano-CaCO3.The tensile strength, tensile strain, young’s
modulus and energy at max load of these composites increased nonlinearly with the addition of the
nano-CaCO3
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Dry Sliding Wear Behavior of Glass and Jute Fiber Hybrid Reinforced Epoxy Com...IJERD Editor
Glass Fiber reinforced composites are emerging as a potential material for a wide variety of
industrial applications owing to their good combination of physical and mechanical properties. In recent
decades, glass fiber composites parts are widely used as sliding components in different engineering
applications. Due to the legitimate theoretical and practical importance, the study of tribological performance of
these emerging materials becomes highly decisive. In the present research initiative, two type of reinforcements
are selected there are Glass and jute fibers with matrix of epoxy 551 was used for composite specimen
preparation. The frictional and wear characteristics of the developed composites have been studied under
different sliding conditions. From the results it is conclude that jute is more efficient in improving the
tribological Performance of glass-epoxy composites than the raw glass fiber reinforced epoxy composites.
Performance Analysis of OSTBC MIMO Using Precoder with ZF & MMSE EqualizerIJERA Editor
In this paper, a bit error rate analysis is presented for multiple-input–multiple-output (MIMO) system with finite-bit feedback is considered in PSK modulation technique, where a transmit signal consists of a rotational precoder followed by an orthogonal space–time block code (OSTBC) which achieve full diversity when a linear receiver, such as, zeroforcing (ZF) or minimum mean square (MMSE), is used. By choosing different parameters, codes with different symbol rates and orthogonally can be obtained .In this paper, we compare the performance of a family of space-time codes. Simulations show how the precoders obtained by our proposed criterion and method perform better bit error rate reduction compared to the existing ones.
Door Misha de Sterke
van De Sterke Consultancy
Volg me via @mishadesterke
Meer informatie? Ga naar www.mishadesterke.nl of mail naar desterkeconsultancy@gmail.com
Seismic Response of RC Framed Buildings with Open Ground StoreyIJERA Editor
RC framed buildings are generally designed without considering the structural action of masonry infill walls. These masonry infill walls are widely used as partitions and considered as non-structural elements. But they affect both the structural and non-structural performance of RC buildings during earthquake. RC framed building with open ground storey is known as soft storey, which performs poorly during earthquake. In order to study this total 144 RC framed buildings having bare frame, full infill frame and open ground storey frame were analyzed by seismic coefficient method and response spectrum method for various seismic hazards. The present study deals with the comparison of base shear for medium rise RC framed buildings having P+5, P+7, P+9 and P+11 storeys for various seismic zones (III, IV & V) and for various soil conditions (Hard & Medium) as per IS 1893(part 1): 2002. This work helps in understanding the effect of earthquake with increase in height of RC framed buildings on base shear for various seismic zones and soil conditions. The result shows that the effect of infill stiffness on structural response is significant under lateral loads. It is found that the presence infill walls increases the base shear by 60-65% more than bare frame by both seismic coefficient method and response spectrum method.
Implementation of Line of Balance Method for Scheduling High-rise BuildingIJERA Editor
In linear construction projects like high rise buildings, roadways, pipelines where activities are repeated after a specific interval, it is very much important for project manager to monitor the project at each stage. Line of Balance method is therefore useful for the project like high rise building to monitor the progress of the work. This method is useful for calculating the total duration of the project, crew synchronization and also shows the process, status, timing and phasing of the project activities. The overall objective of this study is to identify the total duration required by the project for its completion and its comparison with the actual plan by using Line of Balance method, to crash some of the activities and find out the total duration of crashed activities and to calculate labours required for the crashed activities by drawing the graph of Histogram.Keywords- crashing, crew synchronization, buffer, Histogram, Rate of Production
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
EFFECT OF SHORT GLASS FIBER AND FILLERS ON DRY SLIDING WEAR BEHAVIOUR OF THER...IAEME Publication
The dry sliding wear behaviour of thermoplastic copolyester elastomer (TCE) reinforced with fibers and fillers were slid against a steel counter face of a pin-on-disc tribometer. The filler and fiber reinforcements used are polytetrafluroethylene (PTFE), short glass fiber (SGF), short carbon fiber (SCF), silicon carbide (SiC), and alumina (Al2O3). The parameters like filler content, sliding velocity and sliding distance on the specific wear rate have been investigated. In this study, a plan of experiments based on the techniques of Taguchi was performed to acquire data in a controlled way.
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
A Study on Strength and Durability of Concrete Using Corn Cob Ash and Polyeth...
Tensile properties of unidirectional glass/epoxy composites at different orientations of fibres
1. Alok Hegde et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 3, ( Part -1) March 2015, pp.150-153
www.ijera.com 150 | P a g e
Tensile properties of unidirectional glass/epoxy composites at
different orientations of fibres
Alok Hegde, R S Darshan, Fayaz Mulla, Md Shoeb, M Rajanish
(Department of Mechanical Engineering, Dayananda Sagar Academy of Technology & Management,
Bangaluru)
Abstract
In this work, Diglycidyl Ether of BisphenolA(DGEBA) / TriEthylene Tetra Amine(TETA) system is used as the
epoxy matrix and unidirectional glass fabric is used to reinforce with the polymer matrix by hand layup and
vacuum bagging process. The glass fibre reinforced composites are prepared with fibre orientations of 0°, 45°
and 90°. The specimens, after preparation, are tested for various tensile properties at different angles of the
laminate. The tensile properties studied in this case are Tensile Strength, Tensile Modulus, Specific Tensile
Strength and Specific Tensile Modulus. The result shave then been tabulated and studied to understand variation
in the properties with orientation of fibre in the composite. Experimental procedure is carried out as per ASTM
D3039 standards.
I. Introduction
Fiber reinforced composite materials are
demanded by the industry because of their high
specific strength, especially for applications where
weight reduction is critical [1&2]. It is well known
that the fibre orientation affects the strength and
stiffness of polymer matrix composite structure [3].
The main properties that describe a composite
material are the engineering constants and the
strength properties of a single unidirectional lamina
that make the laminated structure [4]. Greater
understanding of the role of variation in tensile
properties with orientation of fibres in the laminate
was acquired through the experiments [5].
II. Fabrication of specimens
The process of fabrication is carried out by
using Diglycidyl Ether of BisphenolA (DGEBA) /
TriEthylene Tetra Amine (TETA) as the epoxy
matrix, chemically belonging to the „epoxide‟ family
is used as the matrix materialin the ratio 10:1. The
composite specimen is fabricated as per the standard
procedure. Unidirectional fabric of E-glass with
density 220 gsm is used to reinforce the polymer
matrix. The surfaces will be thoroughly cleaned in
order to ensure that they were free from oil, dirt etc.,
before bonding at room temperature and pressure.
The laminate will be allowed to cure for about 24
hours.
Figure 1, Manufacture of Glass fibre laminate
using Vacuum hand lay – up technique
Vacuum hand lay – up technique (Fig 1) was
used to make the laminates. Vacuum bag moulding
uses a flexible film to enclose the part and seal it
from outside air. A vacuum is then drawn on the
vacuum bag and atmospheric pressure compresses
the part during the cure. Vacuum bag material is
available in a tube shape or a sheet of material [6].
Vacuum level (500 mm of Mercury for 2 hours) was
monitored so as to avoid surface undulations and
also avoid air pockets at the interface. Vacuum hand
lay – up process offers many benefits when
compared to conventional hand lay-up techniques.
As it is a closed moulding process, it virtually
eliminates potentially harmful volatile organic
compound (VOC) emissions. The vacuum system
also facilitates good resin distribution and
consolidation of the laminate. As a result, the
RESEARCH ARTICLE OPEN ACCESS
2. Alok Hegde et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 3, ( Part -1) March 2015, pp.150-153
www.ijera.com 151 | P a g e
mechanical properties of the laminates are likely to
be higher than the case with hand laminating.
The laminate will be allowed to cure for about
24 hours at room temperature and then it is cut to
obtain test specimens with 3 different orientations of
glass fibre (0°, 45° and 90°) as shown in fig. (2)
Figure 2, Orientation of Test Specimens in the
Laminate
III. Experimental details
Testing for Tensile Strength and Tensile
Modulus was carried as per ASTM D-3039
standards [7].
This test method determines the in-plane tensile
properties of polymer matrix composite materials
reinforced by high-modulus fibers. The specimen is
machined from a flat laminate in to the required
shape. Fig. 3 shows the testing apparatus.
Density of the specimen was calculated and
found to be approximately equal to 58.889 kg/m3
Specific Tensile Modulus=(Tensile
Modulus/Density)
Specific Tensile Strength=(Tensile
Strength/Density)
Figure 3, Tensile Testing Apparatus
IV. Results and Discussion
Using the density of the material and the values
of tensile strength and tensile modulus obtained
experimentally, the values of specific tensile
strength and specific tensile modulus were
calculated and tabulated as shown in table 1.
Fig.4 shows the fractured specimen and fig. (5a-
5f) shows stress-strain curve obtained.
Table 1, Tabulation of Testing Results
Orientation
(Degrees)
Specimen
Number
Tensile Strength
(MPa)
Tensile
Modulus
(GPa)
Specific Tensile
Strength
(MPa-m3
/kg)
Specific Tensile
Modulus
(GPa-m3
/kg)
0
1 324.42 10.07 5.529 0.171
2 326.92 10.07 5.572 0.171
45
1 47.71 2.53 0.813 0.0431
2 49.40 2.53 0.842 0.0431
90
1 37.81 1.55 0.644 0.0264
2 22.40 2.32 0.381 0.0395
90°
0°
45°
3. Alok Hegde et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 3, ( Part -1) March 2015, pp.150-153
www.ijera.com 152 | P a g e
Fig 4, Fractured Test Specimens
4.1 Graphs
Fig. 5a Fig. 5b
Fig. 5c Fig. 5d
From the above results, it can be concluded that
the prepared glass/epoxy laminate exhibits various
strength and stiffness values at different fibre
orientations. Both stiffness and strength are found to
be highest in the longitudinal direction and will be
least in the transverse direction. Also, the specific
strength and specific stiffness are found to be high in
the longitudinal direction as compared to the other
tested directions. This is because of the dominant
properties of the fibres in the longitudinal direction.
As fibre orientation changes from 0° to 90°, the
properties of the fibres decline and the properties of
the matrix dominate. At 45° orientation of fibres,
both the fibres and the matrix play a major role in
determining the properties of the composite. The
difference in these properties may be observed from
the obtained results.
4. Alok Hegde et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN : 2248-9622, Vol. 5, Issue 3, ( Part -1) March 2015, pp.150-153
www.ijera.com 153 | P a g e
V. Conclusion
Over the course of this project, the glass
fibre/epoxy laminate has been fabricated and
suitable specimens have been created and tested to
understand the tensile properties of the composite.
The properties studied are tensile strength, tensile
modulus, specific tensile strength and specific
tensile modulus. The values have been tabulated and
additional results for specific tensile strength and
specific tensile modulus have been calculated. From
the results it is understood that the fibre reinforced
polymer laminates exhibit higher strength and
stiffness properties in the longitudinal direction as
compared to other directions.
References
[1]. (2008) Grit, the Advantages of Epoxy
Resin versus Polyester in Marine
Composite Structure. RINA Marine
Renewable Energy Conference, The Royal
Institution of Naval Architects.
[2]. Whitney, J.M. and Browning, C.E. (1985)
On Short-Beam Shear Tests for Composite
Materials. Experimental Mechanics 25,294-
300. http://dx.doi.org/10.1007/BF02325100
[3]. Plastics and Composites, 29(12) (2009)
[4]. Rajanish, M., N. V. Nanjundaradhya, and
S. Sharma Ramesh. "A Review Of Failure
Of Composite Materials." International
Journal of Enginnering Research and
Applications 3.2 (2012): 122-124.
[5]. Rajanish, M., N. V. Nanjundaradhya, and
Ramesh S. Sharma. "Influence of Nano-
Modification on the Interlaminar Shear
Strength of Unidirectional Glass Fiber-
Reinforced Epoxy Resin." Journal of
Minerals and Materials Characterization
and Engineering 2014 (2014).
[6]. Kullor L.P and springer G.S., “Mechanics
of Composite Structure”, Cambridge
University Press – Stanford, 2003
[7]. Stuart M. Lee - Handbook of Composite
Reinforcements – Page 317
[8]. American Standard and Testing Methods
(ASTM) (2004). Standard Test Method for
Tensile Properties of Polymer Matrix
Composite Materials.