In-plane and flexural engineering constants of a laminate

For symmetric laminates it is possible to define effective in-plane moduli in terms of the in-plane stiffness or extensional compliance matrix, since there is no coupling between in-plane and bending response. The effective 

Similarly, the flexural elastic moduli of symmetric laminates are readily obtained from the bending compliance matrix. 

Examples of angle-ply and quasi-isotropic laminated T300/5208 (carbon/ epoxy) are analysed in terms of in-plane and flexural engineering constants. The lamina engineering constants were given in Table 11.1. Table 11.2 shows the longitudinal modulus and Poisson s ratio for different laminates experimentally measured [14]. The measured data compare quite well with calculated values from CLT. 

Using the two quasi-isotropic laminates from Table 11.2, the flexural engineering constants, functions of orientation, were calculated and compared 

41 Polar variation for the [ 102ls laminate of (a) longitudinal modulus, (b) shear modulus and (c) Poisson s ratio. 

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