Early diagnosis for the stress concentration zone of borehole casing pipe by metal magnetic memory and wavelet transform;

Three-dimensional stress concentration and its influence on the fatigue strength at an elliptic hole;

Model test of mine tunnel in stress concentration areas with digital photography-based deformation measurement technique;

The results indicate that magnetic memory testing method can determine the welding line nature and synthesis,evaluate it with magnetic leakage field parameters,and find disfigurement in welding with magnetic leakage field grads and intensity coefficient of concentration of stress.

Practice showed that in this way the forward creep was reduced effectively, and concentration of stress was prevented, and mechanical properties of products were improved, the cold bending cracking was decreased significantly.

The article mainly discusses the effects which various elements on the project will have on the protracted limit,such as concentration of stress.

In order to analysis the performance of the compound four-bar parallel micromanipulator, its concentrated stress model is analyzed and dynamic characteristic is modeled by using of Lagrange equation.

The effection of thickness of welding parts on the stress intensity factors were researched.

The affection of tilting angle of welding parts to stress intensity factors were researched.

Using ANSYS software have static analysis for connecting rod bolt,gaining location of stress intensity,depended on Weibull distribution probability function calculated equivalent stress amplitude.

It is shown that the stress concentrate is the main failure cause, a new way is presented.

The fatigue invalidation made by the kind of microcosmic and macroscopical mechanical stress concentrate 80% resulted in equipment part and metal components damage.