According to the theory of rigid kinematics,the differential equation of motion of the warhead during oblique penetration progress was built,and based on the study,the calculation method and procedure of the ricochet angle of the warhead oblique penetrating into the concrete target were designed.

Using elastic solution of thick wall cylinder, it is analyzed that the optimum design on three-layers assembled cavity die of cold extrusion under the elastic limit stress.

Based on the analysis of the vertical sealing mechanism of fault and its influncing factors, this paper puts forward the conception of favounable depth forming the vertical sealing of fault, establishes the method determining upper and lower limit depth by the equalization of the vertical pressure of faulted zone to elastic limit and intensive limit of mudstone.

The side-rolling resistant torsion bar made of this steel exhibits high fatigue life span and elastic limit.

Ballistic limit parameter tests of the Whipple shield;

Numerical simulation combined with experiment validation was adopted to investigate the ballistic limit of aluminum 5A06 single wall plate,5 mm in thickness,subjected to normal impac.

On the basis of two-phase engineering model for ideal elastic-plastic material,the analytical formula of the critical semi-angle of the projectile nose and the corresponding ballistic limit velocity for the train-hardening material target were gained.

Influence of total bending deformation of the ship on the limiting swinging angle and the least transmission angle of the rocker in longitudinal crank rocker mechanism;

When it approaches the triangular limit,the non-diagonal reflection matrix of triangular statistical model is obtained.