Mechanical Properties of Tensile, Flexural, Impact, Hardness and Water Absorption Tests on Epoxy Composite with Glass Fibre, Black Granite Powder, White Granite Powder and Stone Powder

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Mechanical Properties of Tensile, Flexural, Impact, Hardness and Water Absorption Tests on Epoxy Composite with Glass Fibre, Black Granite Powder, White Granite Powder and Stone Powder

1D. K. Jawad, 2Dr. A. Ramesh

1,2Department of Mechanical Engineering, JJTU, Jhunjhunu, Rajasthan-333001.

Abstract: Improving the Mechanical properties of Composite consisting Epoxy Resin and glass fibre with additives of 5, 10 and 15 by weight percentage of nano particles of White Granite powder, Black Granite powder and Stone powder by considering three test samples. Samples were prepared based on ASTM standards and then finding the Tensile, Flexural, Impact, Hardness and Water Absorption test results. It was observed Tensile, Flexural and Impact, hardness was improved and water absorption capability reduced as compare with the test results of glass Epoxy samples.

Key words: Epoxy, Glass Fibre, Black Granite powder (BGP), White Granite powder (WGP), Stone powder (SP).

  1. INTRODUCTION:

    Composite is a material formed by the combination of two or more materials with distinct chemical properties and obtained material also having distinct chemical properties from its parent material. Epoxy is a versatile polymer consisting one oxygen atom bonded with two carbon atoms and these carbon atom already bonded by some other means. Glass fibre consisting of extremely fine layer of glass. Granite powder and stone powder are the granite polishing industrial wastage.

    Tensile, Flexural, Impact, Hardness and Water absorption tests carried on work samples prepared by varying percentage of granite and stone powder fillers based on ASTM standards to improve the mechanical properties.

  2. METHODOLOGY:

    2.1. Work Sample Preparation:

    Based on the dimensions of the Teflon mould cavity 26×13×0.3 cm3, cut the glass fibre and prepare the Glass Epoxy composites with and without fillers of granite and stone powder by adding 5, 10, 15 weight percentage of fillers and apply first layer of Epoxy in the cavity of Teflon mould.

    Place the first layer of glass fibre on the applied Epoxy and then stick it firmly with Epoxy layer, apply the second layer of Epoxy, Place the second layer of glass fibre on the applied and then stick it firmly on applied Epoxy layer, apply the third layer of Epoxy and Cure the prepared Epoxy sample at room temperature up to the 48 hours.

      1. Tensile Test:

        Prepare the Tensile test sample based on ASTM standards D3039/D3039M. Universal Testing Machine is used for tensile test. Locate the sample in between the jaws one is the fixed jaw and other is movable jaw and then firmly fix sample. Start the machine that applies the pulling load on work sample, observe load is gradually increasing at required load the work sample get broken. Process is continued with all work samples and machine gives the tensile strength results of all samples.

      2. Flexural Test:

    Prepare the Flexural test sample based on ASTM standards D7264. Again using the same Universal Testing Machine, place the sample in a fixer of the table and a flexural tool fixed with in the movable ram and this ram applies the load on the sample, obseve the load is gradually iuncreasing at one extent the work sample get broken. Repeat this procedure with all samples and machine generates the flexural strength results.

      1. Impact Test:

        Prepare the Impact test sample based on ASTM standards D6110-08, Charpy Impact testing machine used to determined the toughness of the sample, it consists of a pendulum hammer, head dial and fixer. First firmly fix the work sample in a fixer, set the dial reading to its staring position and apply the load by releasing pendulum hammer that cuts the sample and reading shows the toughness of the work sample.

      2. Rockwell Hardness Test:

        Prepare the hardness test sample based on ASTM standards D785, Rockwell hardness testing machine is used to find out the hardness of the sample work piece, the main parts of machine are head dial, flat plate, indenter, load lever and hand wheel. Head dial having three scales HRA, HRB and HRC and a small dial that indicates the primary load should be less than 10kgf. Lower support holds the flat plate and operated by hand wheel to move up and down and locate the work piece in between the indenter and the flat plate and

        then apply the primary load. Then apply the secondary load by using load lever after 30 seconds unload the load by using load lever, reading on main dial scale shows the hardness of the sample work piece.

      3. Water Absorption Test:

    Prepare the water absorption test sample based on ASTM standards G99. Water absorption test is used to know the amount of water absorbed by the sample work piece. To do this experiment measure the weight of the work piece and then immersed it into distilled water in a beaker. After 48 hours take out the sample work piece from the water beaker and then measure its weight. The difference in weight shows the amount of water absorbed by the work sample.

  3. RESULTS AND DISCUSSION:

3.1 Notations:

Notations of Experiment Results are shown in the Table.1.

Table 1. Notations of the prepared samples

WF

Without Filler

BG

Black Granite

WG

White Granite

SP

Stone Powder

WF

100% of Glass Epoxy

5BG

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

5WG

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

5SP

5% of Stone Powder and 95% of Glass Epoxy

    1. Tensile Test Results:

      The Ultimate Tensile Strengths of black granite powder, white granite and stone powder of work samples are shown in Table.2 and Fig.1.

      The ultimate tensile strength of glass epoxy is 924MPa and with additive shows comparatively good results at 10% filler materials of black granite powder will improve the strengths 3167MPa, at 5% filler material of white stone granite powder strength improves to 3288MPa as well as at 10% filler material of stone powder the strength improves to 2055MPa.

      Table 2. Standard Ultimate Tesile strengths

      Filler (%)

      Avg. Load (N)

      Avg. Tensile Stress (MPa)

      Avg. Strain (mm/mm)

      Tensile Modulus (MPa)

      0WF

      8459.18

      112.79

      0.122

      924

      5BG

      6495.28

      161.97

      0.0662

      2446

      10BG

      8502.17

      174.55

      0.0551

      3167

      15BG

      7950.31

      106.00

      0.0683

      1552

      5WG

      7386.83

      198.34

      0.0603

      3288

      10WG

      7172.71

      108.93

      0.0568

      1917

      15WG

      7178.67

      139.68

      0.0507

      2754

      5SP

      7956.40

      106.08

      0.0688

      1541

      10SP

      9220.07

      122.93

      0.0598

      2055

      15SP

      6278.54

      83.71

      0.0482

      1738

      Fig.1. Ultimate Tesile Stengths

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

    2. Flexural Test Results:

      The Ultimate Flexural Strengths of black granite powder, white granite and stone powder reinforced epoxy composites are shown in Table.3 and Fig.2.

      Table 3. Standard Ultimate Flexural strengths

      Filler

      %

      Avg. Load (KN)

      Avg. Stress (MPa)

      Flex Modulus (MPa)

      0WF

      0.056

      14.065

      1185

      05BG

      0.076

      17.21

      1741

      10BG

      0.113

      27.34

      2157

      15BG

      0.120

      28.91

      2728

      05WG

      0.100

      24.058

      2038

      10WG

      0.110

      26.31

      2111

      15WG

      0.113

      26.633

      2261

      05SP

      0.146

      34.55

      3088

      10SP

      0.100

      23.79

      2937

      15SP

      0.1300

      31.08

      3066

      The ultimate Flexural strength of glass epoxy with additive shows comparatively good results at 15% by the weights of filler material black granite powder and white granite powder and also 5% by the weights of stone powder.

      Fig.2. Ultimate Flexural strengths

      The ultimate flexural strength of glass epoxy is 1185MPa, the improvements of strength level of the glass fibre Epoxy composite by the additive of Black Granite powder is 27280MPa, white Granite powder is 2261MPa and with stone powder the flexural strength improved to 3088MPa.

    3. Impact Test Results:

      The Ultimate Tensile Strengths of black granite powder, white granite and stone powder work samples are shown in Table.4 and Fig.3.

      Table 4. Ultimate Impact strengths of three test samples

      Filler (%)

      Sample 1

      Sample 2

      Sample 3

      Average Impact Test

      0WF

      1.8

      1.8

      3

      2.2

      5BG

      3.6

      3.1

      3

      3.2

      10BG

      2.3

      2.4

      1.8

      2.2

      15BG

      2.8

      3.8

      1.8

      2.8

      5WG

      2.2

      2.8

      2.1

      2.4

      10WG

      2.6

      2

      3.2

      2.6

      15WG

      2

      2.4

      2.4

      2.3

      5SP

      3.6

      3.4

      3.2

      3.4

      10SP

      4

      4.8

      3

      3.9

      15SP

      4.2

      2.6

      3.4

      3.4

      Fig.3. Ultimate Impact strenths

      The impact strength is good at 10% of filler material White Granite and Stone Powder and at 5% of Black Granite. The maximum impact strength is observed at 10% of filler composition of stone powder.

      The ultimate impact strength of glass epoxy is 2.2J/cm2, the improvements of strength level of the glass fibre Epoxy composite by the additive of Black Granite powder is 3.2J/cm2, white Granite powder is 2.6J/cm2 and with stone powder the flexural strength improved to 3.9J/cm2.

    4. Rockwell Hardness Test Results:

      The Rockwell hardness of three test samples of black granite powder, white granite and stone powder reinforced epoxy composites are shown in Table.5 and Fig.4.

      Table 5. Rockwell hardness of three test samples

      Filler%

      Sample 1

      Sample 2

      Sample 3

      Average Rockwell Hardness number

      0WF

      37

      23

      32

      31

      5BG

      25

      48

      35

      36

      10BG

      45

      37

      40

      41

      15BG

      40

      32

      34

      35

      5WG

      33

      36

      34

      34

      10WG

      34

      52

      40

      42

      15WG

      41

      35

      33

      36

      5SP

      38

      44

      40

      41

      10SP

      32

      53

      40

      42

      15SP

      42

      32

      37

      37

      Fig.4. Rockwell hardness test results

      The Rockwell Hardness Number increases gradually from 5% to 10% filler composition in Black Granite, White Granite and Stone Powder whereas it decreases by addition of filler composition to 15%.

      The improvement of Rockwell Hardness Number with the additive of Black Granite is 41, White Granite powder and stone powder is 42.

    5. Water Absorption Test:

The Water absorption test samples of black granite powder, white granite and stone powder work samples are shown in Fig.5 and Table.6.

Fig.5. Water absorption test amples result

Table 6. Water absorption test samples result

Filler (%)

Before immersed in

water Specimen weight (gm)

After immersed in

water Specimen Weight (gm)

Mass of water

absorbed in

grams

0WF

6.12

6.17

0.05

5BG

5.82

5.86

0.04

10BG

5.15

5.19

0.04

15BG

5.58

5.62

0.04

5WG

5.51

5.53

0.02

10WG

5.67

5.69

0.02

15WG

5.54

5.56

0.02

5SP

6.39

6.41

0.02

10SP

6.89

6.91

0.02

15SP

7.11

7.13

0.02

It was observed White Granite and Stone Powder filler compositions absorbed less water than compared with Black Granite filler compositions.

The Water absorption is constant for all the filler composition of Black Granite, White Granite and Stone Powder.

The Water absorption is 0.04gms with the additive of Black Granite, 0.02gms with the additives of White Granite powder and stone powder.

CONCLUSION:

Tensile strength improved to 3167MPa with Black Granite powder by the weight percentage additive is 10%, 3288MPa of strength improved with the 5% of white Granite and 2055MPa strength improved with the 10% of Stone powder.

Flexural strength improved to 2728MPa with Black Granite powder by the weight percentage additive is 15%, 2261MPa of strength improved with the 15% of white Granite and 3088MPa strength improved with the 5% of Stone powder.

The ultimate impact strength of glass epoxy is 2.2J/cm2, the improvements of strength level of the glass fibre Epoxy composite by the additive of Black Granite powder is 3.2J/cm2, white Granite powder is 2.6 J/cm2 and with stone powder the flexural strength improved to 3.9 J/cm2.

Rockwell Hardness Number improved to 41 with Black Granite powder by the weight percentage additive is 10%, 42 of improved with the 10% of white Granite and Stone powder.

Water absorption is constant to 0.04gms with Black Granite powder. 0.02gms white Granite and Stone powder.

The Maximum tensile strength is obtained at filler composition of 5% of WG i.e. 3288MPa. The Maximum flexural strength is obtained at filler composition of 5% of SP

    1. 3088MPa. The Maximum Impact strength is obtained at filler composition of 10% of SP i.e. 3.9J/cm2. The Maximum Rockwell Hardness Number is 42 for the filler composition of 10% of WG and SP and the less Water absorption is 0.02gms for the filler composition of WG and SP.

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AUTHORS PROFILE:

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, completed 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 Experience in Engineering Colleges.

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