Page 228 - Mechanics Analysis Composite Materials

Chapter 4. Mechanics of a composite layer 213

Fig. 4.86. Winding of a lattice layer. Courtesy of CRISM.

F

t-

Fig. 4.87. Carbon-epoxy lattice spacecraft fitting in the assemble fixture. Courtesy of CRISM.

parameters shown in Fig. 4.90. Particularly, the lattice layer presented in this figure
has k = 2, q51 = 4, and 42 = 90".
Because the lattice structure is formed with dense and regular systems of ribs, the
ribs can be smeared over the layer surface, which is thus simulated with a con-
tinuous layer having some effective (apparent) stiffnesses. Taking into account that
the ribs work in their axial directions only, neglecting the ribs torsion and bending
in the plane of the lattice layer, and using Eqs. (4.72) we get