Study On The Structure Analysis And Optimization Of Composite Material Barrel

The application of composite materials in the barrel is to reduce its weight and prolongs its service life, and thus improves the tactical and technical performance of artillery system. According to the research findings of composites, the systematic and detailed analysis for the composite material barrel is conducted by using the advanced computing techniques, analytical procedures and experiment means. The present dissertation aims at the strength property, thermo-elastic property, dynamic property, structure optimization, approximate modeling and experiment study for the composite material barrel, exploring a suit of structure analysis and optimization method, and obtaining some useful conclusions, thus providing reliable theoretical foundation for the application of composite material to artillery barrels.On the basis of mechanics of anisotropic composite material, the mechanical model for the composite material barrel is established, the composite α element stress-strain relation equation is derived and computing method for composite interface stress and strain is explored. Combined the theoretical model with real designed structure of composite material barrel, the finite element model is established. The stress and strain results are obtained. And the strength verification is performed by using second order Tsai-Wu failure criterion.As to the thermo-elastic problem of composite material barrel, the nonlinear thermo-elastic analysis and three-dimension transient thermo-structure coupling analysis are carried out by using finite element method in the present dissertation. The results, obtained for nonlinear thermo-elastic analysis for the simulated composite barrel, show the influence regularity between the physical property parameters variation with temperature and the temperature distribution, thermal stress as well as natural frequency of the barrel. The coupling analysis for a real composite barrel is performed during firing. And the transient temperature field and dynamic stress field are obtained.The dynamic property of composite material barrel is studied at the following three aspects, normal mode, damping and forced response analysis. The natural frequencies and mode shape of the barrel are obtained by modal analysis. In order to study the regularity between the natural frequency of barrel and winding angle of composite, the parameters study of composite material barrel is carried out. The detailed analysis is conducted for the composite damping effect, and the composite energy dissipation formula is derived. Then, the modal damping coefficient is calculated by using modal strain energy method for both free mode and constraint mode. Finally, the forced response analysis is conducted by using...