Page 155 - Mechanics Analysis Composite Materials

140 Mechanics and analysis of composite materials

4.2. Unidirectional orthotropic layer

A composite layer with the simplest structure consists of unidirectional plies
whose material coordinates, I, 2, 3, coincide with coordinates of the layer, x, y, z, as
in Fig. 4.13. An example of such a layer is presented in Fig. 4.14 -principal material
axes of an outside circumferential unidirectional layer of a pressure vessel coincide
with global (axial and circumferential) coordinates of the vessel.

4.2.1. Linear elastic model

For the layer under study, constitutive equations, Eqs. (2.48) and (2.53), yield

(4.53)

z,3
t

Fig. 4.13. An orthotropic layer.

Fig. 4.14. Filament wound composite pressure vessel.