For homogenous material or where modulus in tension & compression is same, theoretically both
moduli should match.
But when tensile & compressive moduli are different then ratio of flexural modulus by tensile
modulus can be derived as 4/(1+sqrt(a))2 where a is ratio of modulus in tension by modulus in
compression.
Flexural modulus should be used for comparison of stiffness of materials as it may be average as
stated by Karol & also that it has dependency upon factors such as test sample thickness.
Nevertheless, It may be used for FEA of parts which have flexural mode of deformation to estimate
closer values of deformation.
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