Tensile Strength Lab Report

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4. Result and discussions-
4.1. Tensile strength

Sr.no. % Vol. fraction of Fiber Jute/Epoxy Composite Tensile Strength (MPA) Coir/Epoxy Composite Tensile Strength (MPA)
01 8.3 26.44 28.07
02 10 28.55 27.72
03 12.5 17.73 26.28
Table 2: Tensile strength of composites Figure 6: Tensile strength of jute/coir epoxy composite
The test results for tensile strengths are shown in table 2. It is seen that the tensile strength of the jute/epoxy composite increases with increase in fiber volume fraction up to 10 vol. % and then decreases at 12.5 vol. %. While Coir/epoxy composites tensile strength continuously decreases with increases fiber percentage. Tensile strength of coir/epoxy composite at 8.3, 10 and 12.5 % volume fraction were 28.07, 27.72 and 26.28 MPA respectively. The highest tensile strength was found in 10 vol% fiber of jute/epoxy as 28.55 MPA. 4.2. …show more content…
Compressive strength-
Sr no. % Vol. fraction of Fiber Jute/Epoxy Composite compressive Strength (MPA) Coir/Epoxy Composite compressive Strength (MPA)
01 8.3 52.4 58.9
02 10 60.1 55.8 03 12.5 41.3 53.5
Table 3: Compressive strength of composites Figure 7: Compressive strength of jute/coir epoxy composite For estimating compressive strength of jute/epoxy and coir/epoxy composites were varied from 8.3, 10 and 12.5 volume fraction of fiber. The composite thickness was taken 3mm for both materials. The related compressive strength readings are in MPA as shown in figure 7. The statistical analysis shows that there is significant decrease in Compressive strength of coir/epoxy composites compared to jute/epoxy composite. The compressive strength of jute/epoxy of 12.5 % vol is lowest (41.3 MPA) while 10 % vol. shows higher values (60.1 MPA).
4.3 Flexural strength-
Sr no. Volume fraction of Fiber Jute/Epoxy Composite Flexural Strength (MPA) Coir/Epoxy Composite Flexural Strength (MPA)
01 8.3 40.91 38.30
02 10 46.84 35.83
03 12.5 34.95 26.93
Table 4: Flexural strength of composites Figure 8: Flexural strength of jute/coir epoxy composite The flexural strength of jute/epoxy composites were found 40.91MPA, 46.84 MPA and 34.95 MPA of three different volume fraction. In general the flexural strength of jute/epoxy composite is high compared to coir/epoxy composites. 4.4 Impact strength- Sr no. % Volume fraction of Fiber Jute/Epoxy Composite Izod Impact Strength (KJ/M²) Coir/Epoxy Composite Izod Impact Strength (KJ/M²) 01 8.3 2.84 9.71 02 10 2.98 8.37 03 12.5 6.23 5.44 Table 5: Impact strength of composites The impact test shows that, coir/epoxy composite has better result than jute/epoxy composite. The highest values were observed 9.71KJ/M2 of coir/epoxy composite at 8.3 % volume fraction. While lowest value were 2.84 KJ/M2 of jute/epoxy composite at 8.3 % volume fraction of fiber. 4.5 Water absorption test- Sr no. Volume fraction of Fiber % Jute/Epoxy Composite Water Absorption rate % Coir/Epoxy Composite Water Absorption rate % 01 8.3 2.15 5.05 02 10 3.02 4.08 03 12.5 3.13 2.80 Table 6: Water absorption rate of composites The statistical analysis reveals that there is significant increase in water absorption for all cases of jute/epoxy composites and decreases in coir/epoxy Composites. The higher values of water absorption in case coir reinforced composites are mainly related . 4.6 Density- Sr no. Volume fraction of Fiber % Jute/Epoxy Composite density in g/cm³ Coir/Epoxy Composite density in g/cm³ 01 8.3 1.02 0.97 02 10 1.01 0.962 03 12.5 0.87 0.948 Table 7: Density of composites The above result shows that, the average value of jute/epoxy and coir/epoxy is 0.96 gm/cm3. It is seen that the density of composite

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