From the silicon carbide or epoxy composite materials,using maximum stress criteria,corresponding to be examples of composite structure template that the intensity of checking theory,and points out that structure formwork pattem made by other kinds of composite materials can make strength check.

To achieve easily and rapidly the key data of the yield shear stress and ultimate shear stress,the double-hole micro-shear,transistors and microchip machine MSP430F149 are used in the testing system.

FEM analysis of the distributions of maximum shear stress in coating system with TiN/Si 3 N 4 double coating layers indicated that the distribution of maximum shear stress is better if the material with relatively low Young's modulus used as the surface layer.

Based on the shear stress analysis on the different locations of the asphalt pavement structure,the paper obtains the distribution characteristics and rules of maximum shear stress under different depths of the pavement.

The analysis shows that maximum shear stress which come into surface-initiated under wheel load is beyond shear strength of asphalt binder.

Through the experimental results and study on the reason of fracture,we considered that mean stress and maximum shearing stress were different in tension and compression,condition of fracture was proposed.

3, the distribution of maximum shearing stress under coating surface is rather beneficial for enhancing the fatigue life of bearings, whereas ratio t/a equ.