火炮关键零部件发射应力分析

【作者】 贾坤荣；

【导师】 卫丰；

【作者基本信息】 西北工业大学 ， 固体力学， 2004， 硕士

【摘要】 本文主要分析火炮发射过程关键零部件的发射应力。分析采用ABAQUS有限元计算软件的显式积分模块，动态模拟火炮发射这一复杂力学过程。研究工作的重点是对火炮关键零部件装配体发射应力有限元计算提出了适合工程设计应用的有限元计算模型。 论文对静力载荷作用下火炮的强度和刚度，特别是火炮炮口的下垂问题进行了计算和讨论。 针对火炮关键零部件的发射应力分析，论文分别讨论了有限元计算模型的网格疏密程度、对称性模型和接触面简化等因素对计算结果的影响。通过对于各个计算模型的综合分析和比较，建立了计算火炮关键零部件发射应力的最佳有限元计算模型。 本文提出了火炮关键零部件的有限元计算模型，该方法以整个装配体为研究对象，克服了单件建模的缺点，并且采用了步长极小的显式积分法，因此其计算结果更符合真实情况。模拟得到的后坐位移与实验测定值基本符合，因此，提出的火炮发射应力计算模型是可行和有效的。 计算结果表明，各关键部件的发射动应力均小于炮钢材料的屈服极限。对于火炮的各个关键零部件，膛内过程是火炮发射的危险阶段。 有限元计算模型的建立，对于火炮结构优化设计、缩短研制周期和降低火炮设计人员的劳动强度都具有重要意义。本文对于承受爆炸、冲击等瞬态载荷作用下的结构动应力计算也有参考价值。更多还原

【Abstract】 This paper mainly analyzed the emission stress in the key parts of a gun in lunch process. According to the characteristic of the process, this paper used explicit method in ABAQUS/explicit module to simulate this transient mechanical process. This paper laid stress on establishing a FEM model, which is suitable for engineering application to calculate emission stress in the key parts of a gun on assembly level.This paper calculated and discussed the strength and stiffness of the gun especially the gun muzzle drop under the gravity.To analyze the emission stress, the paper discussed the effect of different density of mesh, symmetry, and simplifying to the interfaces to the results. After comparing with the results of different model, the best model was built.The analysis is on the assembly level instead of on the basis of single part in the traditional analysis and in explicit method the increments are very small. Therefore, the results are more rational. The recoiling displacement from the numerical simulation showed good agreement with it from simulation tests. So using the method 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. To 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 structure under transient loads such as blast and impact.更多还原