To solve the optimization problem of edge distance in titanium alloy sheet during a new aircraft development stage,a three dimensional FE model was built on ABAQUS platfom.The effect of edge distance on residual stress distribution was analysised with TC4 titanium alloy by interference-fit strengthening technique under cylic loading.The study indicates that a considerble reduction of fatigue life is found with a lower egde distance ratio (L/D),also,the location of fatigue damage is moving against the hole.Fatigue damage happens in the margin part with edge distance ratio(L/D) less than 2.

Interference-fit technology can significantly improve the fatigue life of bolted joints.In this study, based on the stress-wave driving technology, the high-speed driving process of titanium hi-lock bolts was analyzed theoretically, and the process parameters of driving were studied.The results show that the driving resistance of M8 titanium hi-lock bolts for the stress-wave driving is significantly lower than that of static driving under the same condition.The maximum values of the driving resistance under the interference sizes of 1%, 1.5% and 2% are respectively 3.92KN, 5.64KN, and 6.11KN.The installation resistance increases with interference sizes and driving times, while increases against with driving speeds.However, hole crash can be found under several times installation and the damage of bolt head can occur under the higher installation speeds.The maximum height of protuberance increases with interference sizes, driving speeds, driving times and friction coefficients.

The field emission properties of carbon nanotubes are excellent, therefore they are a promising source of electron emission. The emission mechanism of nano-materials are explored in this paper, the electromagnetic software CST is used for building simulation models, and appropriate simulation environment is developed according to the specific structural characteristics of the carbon nanotubes. The simulation results are of great importance to the study of using carbon nanotube array as field emission cathode microwave tube.

复杂目标的激光雷达散射截面（LRCS）一直以来是激光探测和隐身中很重要的一个参数。对于LRCS计算的理论方法已经比较成熟,但是在将目标建模、目标表面材料涂覆、且标整体LRCS计算相结合的一体化设计方面,还存在一些有待解决的问题。针对该问题,介绍了一种基于Unigraphics造型软件,结合图形电磁计算（GRECO）以及双向反射分布函数（BRDF）模型的复杂目标（涂覆）LRCS计算软件的一体化开发方法。计算实例表明,使用这种方法,程序的一体化设计效果良好,而且具有较高的计算精度和准确性。