Geometric Parameters and Numerical Simulation of Drawing Process for Odd Number Side Drill Hollow Steel Stem;

Forming Process Design of Pipe Drawing Based on Multi-objective Optimization;

3D FEM simulation of cross tube drawing process;

5% single pass draught to draw,taking all these measures can get the product with high strength,high toughness and definite bending property.

Some methods of forcing lubrication under drawing were introduced,and their characteristics were analyzed.

It is considered by examination and analysis that the main causes of brittle fracture in drawing and lower specific elongation of finished wire are local martensite existence for alloy elements’segregation, carbon segregation leading net cementite and the continuity of metal being destroyed by high nonmetal inclusion; the transverse crackles of steel wire surface are due to the deep.

Working mechanism of fully grouted bolt in pull-out working state;

The analysis of mechanical interacting between fiber and matrix was presented in this paper,the whole process of fiber pull-out load and pull-out displacement was carried out by using numerical method.

As an important means for evaluating the surface modification of reinforcing fibers and the quality of composite interface,single fiber pull-out test has been highly regarded.

According to the status of the laggard reason of the woman marathon sport level in china,author analyzed the laggard reason from view of pedagogy,the subject of select material and training,present reasonable advices for 29th Olympic game.