Optimization of process parameters and mechanical properties of hybrid fibre reinforced by epoxy resin by response surface methodology (RSM)

Natural fibers and synthetic fibers have several advantages that have made them particularly attractive to the automobile industry. These include relatively good mechanical strength, low density better thermal and acoustic insulation and low cost. According to the need the different type of fibers composites (Natural, synthetic and composite of natural and synthetic) can be reinforced. In this work, there are 20 experiments are conducted to fabricate the hybrid (glass fiber and coir fiber) composite fiber with the help of design expert software and these fabricated composite fiber were tested according to ASTM standards and found the optimum and maximum tensile strength and strain of the composite fiber. Two quadratic model were given to correlate the process variables to the responses. The glass fiber is most significant factor for both the responses. The optimized input process parameters were found of glass fiber, coir fiber and filler are 100 gram of glass fiber, 40 gram of coir fiber and 80 gram of filler (Epoxy + Hardener) respectively. The optimized output responses value of tensile strength and strain were found 49.27 MPa and 14.43% respectively.
The developed models was tested using ANOVA method with the help of design expert software. The ANOVA results for tensile strength and strain for hybrid composite fiber are shown in table 2-3. All models gives the highly significant fisher’s F value which shows that the model adequately representing the relationship between input process parameters and response. The fisher’s F value of the tensile strength for hybrid composite fiber was found 5.32, whereas the fisher’s F value for the strain was 9.87. The P value is very small for tensile strength P (0.0076) which represented that the generated models have only 0.76% chance that a model Fisher’s value could occur due to noise, whereas developed model for strain have only 0.07% chance that a model Fisher’s F value could occur due to noise. For tensile strength model, the residual error value (205.08) should be the sum of lack of fit (173.58) and pure error (31.5). By this column of fit summary recommended quadratic model is statically significant for analyzing the tensile strength of hybrid composite fiber.
The contour plot and 3D response surface graph are made based on the model developed by considering the optimum process parameters. The optimum tensile strength and strain value of hybrid composite fiber is exhibited by the peak of response surface as shown in fig. 6-7. The effect of straight behavior of glass fiber on hybrid composite fiber is to increase the tensile strength whereas curly behavior of coir fiber is decrease the tensile strength as shown in fig. 8-9. When the glass fiber is increases than the tensile strength also increases whereas tensile strength is decreases when coir fiber increases. The maximum tensile strength (57 MPa) was found at 80 gram glass fiber, 40 gm coir fiber and 100 gram (epoxy+hardener) as shown in fig. 4.

This article is published in peer review journal and open access journal, International journal of research in engineering and innovation (IJREI) which have a high impact factor journal for more details regarding this article, please go through our journal website.

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