Value in the parenthesis is the experimental results. Here all the values follow the same trend as experimental data. The difference between experimental values and predicted values of flexural strength is less than 5.00 % and its correlation co-efficient is estimated as 0.999. 21.4 Conclusion From the experimental results obtained (see Table 21.1), it can be observed that untreated coir fiber reinforced polyester matrix composite specimens of 5 mm thickness have given highest flexural strength at its 20 % fiber volume fraction. In general it can also be observed that the flexural strength of coir fiber reinforced polyester matrix composite specimens is found to increase with increase in thicknesses. Further it can be observed from the Table 21.2 and Fig. 21.5, when the fiber volume fraction increases above 21 % a decrease in flexural strength is observed. From the above observations it can be 0 10-6 10-5 10-4 10-3 10-2 10-1 5 10 15 20 44 Epochs 25 30 35 40 Performance is 9.93558e-006, Goal is 1e-005 Training-Blue Goal-Black Fig. 21.3 ANN convergence curve 0 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 5 10 15 20 Epoch 25 30 35 40 45 Mean Square Error (MSE) Optimal Training Parameters 1 Epoch = 10 Cycles Learning Rate = 0.4 Error Goal = 1e-5 MSE Fig. 21.4 Variation of mean square error with epoch 21 Prediction of Flexural Properties of Coir Polyester Composites by ANN 177
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