Page 313 - Mechanics Analysis Composite Materials

298 Mechanics and umalysi.7 of composite mcrrerials

(2)
For p 3 pu , we should put E2 = 0,GI?= 0 and VI? = 0 in the circumferential
layer whose stiffness coefficients become

Membrane stiffnesses of the structure now correspond to the monotropic model of a
composite unidirectional ply (see Section (3.3)) and can be calculated as

P,MPa
-
IO

8-

6-

4-

0 0.4 0.8 1.2 1.6 2 2.4 2.8
(a)
P,MPa

0 0.4 0.8 1.2 1.6 2 2.4 2.8
(b)
Fig. 6.22. Dependence of the axial (a) and the circumferential (b) strains on internal pressure. (-)
analysis; (0)experimental data.