The equivalent shear-wall structure model can not consider effective elastic modulus and in-plane effective shear modulus of the multi-ribbed composite wall simultaneously,so it causes some deformation errors between the equivalent model and the actual structure.

Applying the equivalent structure method,the equivalent structure is got,then the finite ele- ment modal of the antenna structure is built.

Two kinds of primitive parameters inverse seeking method—the inverse seeking method of equivalent loading of mechanical structure and the inverse seeking method of equivalent structure—were studied and analyzed.

The result of the effective strain and the effective stresss in cavity die circular section is caculated by simulating the cup drawing in different states cosidering strain, stress and thickness changes.

Through FEM numerical simulation of flanging process which was carried out with ABAQUS software,the cognition that flanging process can be divided into 4 stages,the dynamic process of flanging,the method of computing for the prepared hole-diameter,the material thickness transformation of deformation area and the characteristic of effective stress distribution,etc.

The effective strain and effective stress are introduced under the condition of axial symmetry.

Simulation on equivalent stress in soldered joints of QFP devices with different leads;

Expression on equivalent stress and equivalent strain of wall rock state of tunnel;

Simplified calculation on equivalent stress of vortex dedendum under the effect of uniform internal pressure;