| This paper mainly analyzed the natural frequency of a gun and the emission stress in the key parts of a gun when it is in lunch process. The paper used ABAQUS/standard module to simulate the natural frequency of a gun; used ABAQUS/explicit module to simulate lunch process. The paper focused on the establishment of a FEM model which is suitable for engineering application to calculate emission stress in the key parts of the gun on assembly level.To analyze gun's natural frequency, the paper calculated and discussed the different simplifying methods of muzzle brake on how to affect the computed value of the model and get the best model for this analysis. Further more, the paper analyzed the material of tube in different density and temperature on how to affect the natural frequency of a gun.To analyze the emission stress, the paper discussed the effect of different density of mesh, symmetry, and simplifying to the interfaces. After comparing the results of different models, the best model for this analysis was built in the paper.The analysis is on the assembly level instead of on the basis of single part in the traditional analysis. The increments are very small by using explicit method, so the result is more rational. The recoiling displacement from the numerical simulation showed good agreement with it from simulation tests. So using the model to analyze emission stress of the gun is feasible and effective.The result of simulation indicated that the maximum of Mises stress in all the key parts is less than the yield stress of the gun steel. For all the key parts, the interior ballistic process is dangerous stage in the lunch process of the gun.To the designers of the gun, the building of FEM model is very useful in structural optimization design by shortening the period of design and reducing work intension. This method has reference values in analyzing the dynamic stress in some structures under transient loads such as blast and impact. |
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