Flexural test specimens.<br>To find the optimum span length, best fit curve approach is used. Apart from the span lengths 32 mm, 48 mm, 64 mm and 80 mm, the numerical analysis is done for two extra span lengths 24 mm and 96 mm. It is concluded that the polynomial of degree 3 provides best fit for the data points with minimum percentage error between numerical results and experimental results, due to which the data is extrapolated for other two materials using the equation of curve. The values of flexural modulus are then calculated for various span lengths below 32 mm and above 80 mm. Analysis depicts that the flexural modulus initially increases and then decreases gradually with the increase in the span length for all four materials. The behavior of the flexural modulus shows the optimum span length is at the point where the maxima of flexural modulus vs span length curve occurs. The values of optimum span length obtained from the graphs on the modulus basis are the following. For CFRP-G801 was 80 mm, GFRP-7781 was 67 mm, CFRP-HTA7 was 48 mm and GFRP-EC 9756 was 42 mm.
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