Design And Research Of One-dimension Projectile Trajectory Corrector In Projectile Base

The metal shell which has a character of light weight and large loading capacity is widely usede in industrial and especially in military.Howeverjust because of its special structure.the metal shell is extremely prone to failture in the process of impact,seriously affect the performance itself,so as to reach the expected result.Therefore it is necessary to do experimental research on the stress process of different conditions of metal sheel,to be the argument of numerical simulation,and get the influencing factors of the yield failture.Thus can ensure the stability of a metal shell in the greastest degree,and to play its best performance.In this paper,the yield failture mechanism of the metal shell which has a large filling is analysized by a method of the combination of theoretical analysis, numerical simulation and experimental study, the main influencing factors of the yield failture of the metal shell is given,which provides the theoretical basis and technical support for the design of the large filling shell.Main contents of this paper include:Firstly, Two failture modes of the yield failture and the buckling failture are compared and the characteristics of each of the two failture are studied, the metal shell occures yield failture rather than buckling failture,espescially the Tresca yield criterion and the Von-Mises yield failture is studied which is used to judge whether the object occurs yield failture.Secondly, The experiment takes the following conditions:the colliding body with diffent speeds,qualities;the shell with diffent materials,different head shapes,different medial shapes,different length-diameter ratio.Numerical simulation of the yield failture process of the metal shell under different conditions is done by using the finite element software ANSYS-DYNA; also the deformation of the metal shell can be seen by using the LS-PREPOST processing software.Thirdly, The trational SHPB experiment device is improved. The experimental results and numerical simulation are compared, the following conclusiomthe metal shell of a large filling which is in axial symmetry stress state is prone to yield failture; The speed, quality of the colliding body, the material of the shell, the head shape of the shell.the head shape of the shell, the inside shape of the shell, the aspect ratio of the shell and the filling material of the shell are the influencing factors of yield destruction.