This paper presents a finite element method for predicting the effective elastic properties of composite materials based on the least square method.

The equivalent modulus of elasticity of CFRP with super great spans cables is much higher than that of steel cables and the cables are longer,the difference of them is bigger.

2-D homogenization method was applied to study the effects of the micro-structure(cell shape and size)on the equivalent elastic constants of porous structures so as to simplified the problem.

To verify the correction of these equivalent elastic constants,linear static analysis of an aluminum sandwich plate under pressure out of panel was performed with NASTRAN program.

For the purpose of the structural application of fiber-reinforced plasterboard filled with concrete(composite wall-board)in tall building,one wallboard type was selected and the method of materials mechanics was used to simplify it to orthotropic board and equivalent elastic constants were obtained.

Application of difference ratio of equivalent elastic modulus in identifying low resistivity hydrocarbon layers;

The equivalent elastic modulus and the nominal axial stress of non-regular holey laminated plates are assumed.

Applying classical wave theory,a concept of equivalent elastic modulus on propagation speed modification of guided wave through“variable cross-section”of metal bar embeded layer was put forward.

Then a homogenization finite element method (Homo FEM) is developed for the 2-D periodic structures and applied to the calculation of the equivalent elastic constants Es and?_(s) of a regular honeycomb structure with various relative densities.

A homogenization FEM is derived for the 2-D periodic structures and applied to the calculation of theequivalent elastic constants of a square honeycomb structure with various relative densities.