Tensile and Flexural Strengths of Epoxy Composite with Fibre Glass, Black Granite, White Granite and Stone Powder

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Tensile and Flexural Strengths of Epoxy Composite with Fibre Glass, Black Granite, White Granite and Stone Powder

D. K. Jawad, Dr. A.Ramesh

Department of Mechanical Engineering, JJTU, Jhunjhunu, Rajasthan-333001


Study and experimentally analysis of Mechanical properties of Epoxy Resin composite and glass fibre with additives of 5%, 10% and 15% nano particles of White Granite, Black Granite and Stone powder separately, considering three test samples and finding the Tensile strengths and Flexural strength.


Epoxy Resin, Black Granite powder, White Granite powder, Stone powder, Tensile Strength, Flexural strength.


A composite is defined as a combination of two or more materials with a distinguishable interface. The oldest man-made composite is concrete, which is associated with a macrolevel reinforcement. The urge to improve the properties of composite materials, has prompted material scientists to investigate composites with lower and lower reinforcement size, leading to the development of microcomposites and the recent trend in composite research is nanocomposites (with nanometer scale reinforcements). On the basis of the nature of the matrices, composites can be classified into four major categories: polymer matrix composite (PMC), metal matrix composite (MMC), ceramic matrix composite (CMC) and carbon matrix composite or carbon carbon composites. PMC can be processed at a much lower temperature, compared to MMC and CMC. Depending on the types of polymer matrices, PMC are classified as thermosetting composites and thermoplastic composites.

Epoxy resins are a class of versatile polymer materials characterised by the presence of two or more oxirane ring or epoxy groups within their molecular structure.

Like other thermosets they also form a network on curing with a variety of curing agents such as amines, anhydrides, thiols etc. Amine curing agents are most widely used because of the better understanding/control of epoxy-amine reactions.

The broad interest in epoxy resins originates from the versatility of epoxy group towards a wide variety of chemical reactions and the useful properties of the network polymers such as high strength, very low creep, excellent corrosion and weather resistance, elevated temperature service capability and adequate electrical properties. Epoxy resins are unique among all the thermosetting resins due to several factors namely, minimum pressure is needed for fabrication of products normally used for thermosetting resins:

  • Shrinkage is much lower and hence there is lower residual stress in the cured product than that encountered in the vinyl polymerisation used to cure unsaturated polyester resins.

  • Use of a wide range of temperature by judicious selection of curing agent with good control over the degree of crosslinking.

  • Availability of the resin ranging from low viscous liquid to tack free solid, etc. Because of these unique characteristics and useful properties of network polymers.

  • Epoxy resins are widely used in structural adhesives, surface coatings, engineering composites, and electrical laminates.

Generally, in composite systems, there are three main matrix types including polymer, metal, and ceramic with different additives in various forms such as lamina, fillers, fibre (short and continuous), flake, and particles. In this field, nanocomposites are defined with at least one component in nanometric scale.

Glass fibre (or glass fibre) is a material consisting of numerous extremely fine fibres of glass.

Granite powder, a waste material from the granite polishing industry, is a promising material for use in concrete similar to those of pozzolanic materials such as silica fume, fly ash, slag, and others. These products can be used as a filler material (substituting sand) to reduce the void content in concrete. Granite powder: These products can be used as a filler material (substituting sand) to reduce the void content in concrete. Granite powder is an industrial by product obtained from crushing of granite stone and granite stone polishing industry in a powder form.


H.V.Rama Krishna at all (2005), they conducted the test on Granite powder-reinforced epoxy composites have been developed with varying granite powder content by weight percentage. The variation of tensile strength and impact strength has been studied and the tensile strength and impact strength were found to be at a maximum for the 50% granite powder-reinforced epoxy composite4.

H.V. Ramakrishna and S. K. Rai (2005), they carried out study on the properties of two particulate reinforced epoxy composites namely granite powder and fly ash have been assessed. An attempt has also been made to improve the pure matrix system epoxy resin using commercially available thermoplastic (polymethyl methacrylate). Pure blend matrix with different weight fractions of polymethyl methacrylate and epoxy are prepared and the blend matrix having the highest strength is selected for preparing composites5.

H.V.Ramakrishna at all (2005), they carried out the test on Composites using unsaturated polyester as the matrix and granite powder and fly ash as fillers. The tensile and flexural strengths of these composites are determined. The variation of tensile and flexural properties with weight fraction of the

fillers is studied. The properties of granite powder composites are found to be better than those of fly ash composites7.

H.V.Ramakrishna at all (2005), they studied the Epoxy is toughened with polymethylmethacrylate (PMMA) and different percent weights of granite powder and fly ash are added to this matrix. The tensile and flexural strengths of these composites are determined. The variation of tensile and flexural strengths with granite powder and fly ash content is studied. For comparison, epoxy is also used as the matrix. The tensile and flexural strengths increased with PMMA content up to 4% (w/w) in the composites. The granite powder composites showed better properties than fly ash composites8. H.V.Ramakrishna and S. K. Rai (2006), they performed the study on the tensile, flexural, compression, and impact strength of granite powderepoxy composites on toughening epoxy with unsaturated polyester and unsaturated polyester with epoxy resin has been assessed. The water absorption studies revealed that an increase in the strength of the composites showed a positive toughening effect6.

H.V.Ramakrishna at all (2007), they conducted the experiments on Granite powder is an inexpensive material that can reduce the overall cost of a composite if used as a filler in epoxy and acrylonitrile butadiene styrene (ABS)-toughened epoxy matrices. Epoxy and ABS-toughened epoxy resins filled with granite powder were cast into sheets. To enhance the properties of these composites, granite powder was treated with triethoxymethyl silane coupling agent. Flexural properties, compression properties, chemical resistance, and morphology of these composites were studied9.

J.Cho bat all (2007), they did the experiments on the epoxy matrix in carbon fiber/epoxy composites was modified with graphite nanoplatelets to improve their mechanical properties. Graphite nanoparticles were mixed and dispersed in the epoxy matrix by sonication, followed by a vacuum assisted wet layup process. The composites reinforced with nanoparticles showed enhanced compressive strength and in-plane shear properties. A simple analytical model was used to predict the longitudinal compressive strength, which was in good agreement with experimntal results10.

Nishar Hameed at all (2007), they used E-glass fibre as the fibre reinforcement, dynamic mechanical and thermal characteristics of the systems were analyzed. The dynamic moduli, mechanical loss and damping behaviour as a function of temperature of the systems were studied using dynamic mechanical analysis (DMA). DMA studies showed that DDS cured epoxy resin/SAN/glass fibre composite systems have two Tgs corresponding to epoxy rich and SAN rich phases12.

Shetty Ravindra Rama and S. K. Rai (2008), they did the

experiment on Hydroxyl terminated polyurethane (HTPU) in different proportions has been incorporated into DGEBA based epoxy resin, cured with triethylene tetramine. Composites are developed using varying weight fractions of silane coupling agent treated granite powder as reinforcement in pure and toughened epoxy resin. Various physico- mechanical properties such as tensile and flexural behavior,

density, and void content have been determined. Studies revealed that toughened resin composites enhance the properties compared to neat matrix18.

A. Godaraa, at all (2009) they performed the study on Carbon nanotubes (CNTs) were incorporated in an epoxy matrix that was then reinforced with carbon fibres. A fixed amount (0.5 wt.%) of different types of CNTs (functionalized and non-functionalized) were dispersed in the epoxy matrix, and unidirectional prepregs are produced1.

Amal Nassar and Eman Nassar (2013), they studied the effect of NanoSiC particles on the mechanical properties for the polymer composite material and using the epoxy resin (EPOBOND Epoxy) supplied from epobond for chemicals and electrical components in Egypt as matrix reinforced with silicon carbide nanoparticles with different weight percentage (5, 10, 15 and 20). The tensile tests were made by using LLOYD" Universal Tensile Testing Machine System at room temperature, the wear tests were made by Pin-on-Disc machine and Charpy impact test machine was used for measuring the impact toughness during impact testing2.

Arun Kumar Rout1 and Alok Satapathy (2013), they studied a new class of low cost hybrid composites consisting of glass- epoxy and filled with four different weight proportions (0 wt%, 10 wt%, 15 wt% and 20 wt%) of granite particulates (a solid waste generated from stone processing industries) are developed. Mechanical study reveals that hardness, tensile modulus and impact energy of these composites are improving with filler addition while a steady decline in tensile and flexural strength is observed3.

Patil Deogonda and Vijaykumar N Chalwa (2013), they described the development and mechanical characterization of new polymer composites consisting of glass fibre reinforcement, epoxy resin and filler materials such as TiO2 and ZnS. The newly developed composites are characterized for their mechanical properties. Experiments like tensile test, three point bending and impact test were conducted to find the significant influence of filler material on mechanical characteristics of GFRP composites14.

Satnam Singh at all (2013), they did the work on determination of mechanical properties of pure epoxy and random oriented glass fibre (mat) reinforced epoxy at 10% and 20% weight fractions of glass fibres. The test specimens were prepared and tested according to ASTM standards. The experimental results revealed that with increase in weight fraction of reinforcement, the tensile strength and flexural strength increased by 14.5 % and 123.65% for 20 % glass reinforced composites over pure epoxy17.

Jorge Antônio Vieira Gonçalvesa at all(2014), they studied the mechanical properties including traction, flexion, compression, and hardness characteristics of a composite made from the combination of epoxy resin and granitic stone powder from the fold-and-thrust belt located in the municipality of Nossa Senhora da Glória, in the state of Sergipe, Brazil. Chemical and mineralogical analyses of the stone and analysis by SEM of the particle/matrix interface are performed11.

Rajkumar.S and Dr.Marimuthu.K (2014), they did the experimental investigation study of basalt fibre reinforced epoxy composites was conducted and their tensile, flexural and impact Strengths were analysed. Owing to the scarcities of

information about their mechanical performances in present literature studies, this work was directed towards providing mechanical characterization of basalt-fibre reinforced epoxy composite, manufactured at various ratios such as 35:65, 40:60, 45:55 (Fibre: Resin)15.

Ravikumar and M.S.Sham Prasad (2014), they conducted the Fracture toughness at six different compositions of composites. Three samples have to be tested for each composition of the composites. It can be concluded that by the addition of small percentage of aluminum oxide filler there is marginal improvement in fracture toughness of glass fabric reinforced epoxy matrix up to 4wt%16.

O.O. Daramola and O.S. Akintayo (2017), they investigated the Mechanical properties (tensile, flexural, hardness) of the developed composite. Silica particles incorporation shows beneficiary effect on the modulus of elasticity, flexural modulus and hardness with threshold value experienced at 2wt%., However tensile strength and flexural strength where found to decrease upon silica addition, the flexural strength values being somewhat higher than their tensile counterparts. SEM images of the specimens revealed the manner of silica dispersion in the matrix13.


After the preparation of Composite material, The material is made in the form of plate and cut into corresponding profiles as per ASTM(American Standards of Testing and Materials) standards for conducting the Tensile test, Impact test , Flexural test , XRD test and check out the tribological properties.


Tensile Test:

Tensile test is a material science test in which the sample is subjected to a controlled tension until failure. Properties that are directly measured via tensile test are ultimate tensile strength, maximum elongation and reduction in area.

Tensile test is a material science test in which the sample is subjected to a controlled tension until failure. Properties that are directly measured via tensile test are ultimate tensile strength, maximum elongation and reduction in area.

Three Point Flexural Test:

The three points bending flexural test provides values for the modulus of elasticity in bending, flexural stress, flexural strain and the flexural stress-strain response of the material.

The test method for conducting the test usually involves a specified test fixture on a Universal testing machine. Details of the test preparation, conditioning, and conduct affect the test results. The sample is placed on two supporting pins a set distance apart and a third loading pin is lowered from above at a constant rate until sample failure.



Tensile Test:

Filler (%)

Load (N)

Cross sectional area (mm)

Stress (MPa)


Modulus (MPa)






























































Maximum Tensile strength value increases up to addition of 10 % filler material for Black Granite and Stone Powder, Further addition of filler decreases their strength whereas in White Granite composite, maximum strength is observed at 5%of filler and further addition of filler material decreases and remains constant.

Flexural Test:


Without Filler


Black Granite


White Granite


Stone Powder


100% of Glass Epoxy


5% of Black Granite Filler and 95% of Glass Epoxy


5% of White Granite Filler and 95% of Glass Epoxy


5% of Stone Powder and 95% of Glass Epoxy



Flexural stress

Flex Modulus (MPa)









































It is observed that the flexural strength increases as the filler composition increases in Black Granite and White Granite from 5% to 15% whereas it is gradually decreased by addition of filler composition in to StonePowder from 15% to 5%.


glass-epoxy hybrid composites, Institution of Mechanical Engineers, Journal of Materials Design and Applications published online 6 August 2013, DOI: 10.1177/1464420713499483.

  1. H. V. Rama Krishna, S. Padma Priya and S. K. Rai (2005), Tensile, Impact, and Chemical Resistance Properties of Granite PowderEpoxy Composites, Journal of Reinforced Plastics and composites, 2005 24: 451, DOI: 10.1177/0731684405043549.

  2. H. V. Ramakrishna and S. K. Rai (2005), A Study on the Mechanical and Water Absorption Properties of Granite Powder/Epoxy Toughened with PMMA and Fly Ash/Epoxy Toughened with PMMA Composites, Journal of Reinforced Plastics And Composites, Vol. 24, No. 17/2005, DOI: 10.1177/0731684405052202.

  3. H. V. Ramakrishna and S. K. Rai (2006), Effect on the Mechanical Properties and Water Absorption of Granite Powder Composites on Toughening Epoxy with Unsaturated Polyester and Unsaturated Polyester with Epoxy Resin, Journal of Reinforced Plastics And Composites, Vol. 25, No. 1/2006, DOI: 10.1177/0731684406055450.

  4. H. V. Ramakrishna, S. Padma Priya and S. K. Rai (2005), Tensile, Flexural Properties of Unsaturated Polyester/Granite Powder and Unsaturated Polyester/Fly Ash Composites, Journal of Reinforced Plastics And Composites, Vol. 24, No. 12/2005, DOI: 10.1177/0731684405049862.

  5. H. V. Ramakrishna, S. Padma Priya and S. K. Rai (2005), Studies on Tensile and Flexural Properties of Epoxy Toughened with PMMA/Granite Powder and Epoxy Toughened with PMMA/Fly Ash Composites, Journal of Reinforced Plastics And Composites, Vol. 24, No. 12/2005, DOI: 10.1177/0731684405049863.

  6. H. V. Ramakrishna, S. Padma Priya and S. K. Rai (2007),

    Tensile strength value increases up to addition of 10 % fillerFlexural, Compression, Chemical Resistance, and material for BG and SP, Further addition of filler decreases theirMorphology Studies on Granite Powder-Filled Epoxy and strength whereas in WG composite, maximum strength isAcrylonitrile Butadiene Styrene-Toughened Epoxy Matrices, observed at 5% of filler and further addition of filler materialJournal of Applied Polymer Science, Vol. 104, 171177 decreases and remains constant. The Maximum tensile strength is(2007), DOI 10.1002/app.25115.

    obtained at filler composition of 10% of SP i.e.123 MPa.

  7. J. Cho, J.Y. Chen and I.M. Daniel (2007), Mechanical

Flexural strength increases as the filler composition increasesenhancement of carbon fibre/epoxy composites by graphite in BG and WG from 5% to 15% whereas it is gradually decreasednanoplatelet reinforcement, Elsevier Ltd, Scripta Materialia by addition of filler composition in SP from 15% to 5%.The56 (2007) 685688, doi:10.1016/j.scriptamat.2006.12.038.

Maximum flexural strength is obtained at filler composition of11) Jorge Antônio Vieira Gonçalvesa, Diego Adalberto Teles

5% of SPi.e.34.5MPa.


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D.K.Jawad, Completed Diploma in Automobile Engineering

in 1995 at Govt. polytechnic, Anantapur, B.Tech. Mechanical Engineering in 2000 from Kakatiya Institute of Technology and Science, affliated To Kakatiya University, Warangal and M.Tech. in Advanced Manufacturing System in 2015 from Kasireddy Narayan Reddy College of Engineering Affliated To JNTUH, Hyderabad.

Dr. A. Ramesh, comp-leted Diploma in Mechanical Engineering in 1985,

B.E. in Mechanical Engineering in 1989 under Bangalore University,

M.E. in Metal Casting Engineering, 1995, from Bangalore University, Ph.D. in Mechanical Engineering in the year 2004 from Mysore University and Sir having the 30 years of Teaching Experince in Engineering Colleges.

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