中文摘要：

针对杠杆式抽筒子工作时出现的断裂失效问题,以动力学和有限元理论为基础,分别进行抽筒子的动态特性研究和拓扑优化设计。得出其在抽筒过程中的动应力分布和危险区域,定性地确定出介质力学参数和工作参数的影响,获得了抽筒子的最佳材料布局和优化改进结构。优化前后抽筒子结构的对比仿真结果表明,改进结构能够使得应力集中危险区域仅为最大动应力降低10.6%的强撞击位置,其余部分均可转换为安全区域且结构刚度提升49%左右。所用方法有效可靠,为解决杠杆式抽筒子的断裂问题提供理论依据和技术手段。

英文摘要：

To the dynamic fracture failure of the level-type cartridge extractor in the extraction process,the dynamic characteristics analysis and topology optimization design are both carried out based on the dynamics and finite element theory. The distribution of dynamic stress and risk areas are obtained during the short period extraction process,the influences of mechanical parameters and the working parameters are analyzed qualitatively. Moreover,the optimal material layout and improvement structure of the cartridge extractor are implemented. Through the physical simulations of the original and optimal structure model,the comparison results show that only the impact position in the improvement structure belongs to risk area,of which maximum dynamic stress reduces 10.6 % and the structural stiffness improves 49 %. The analysis method and technological process is effective and reasonable, which provides theoretical basis and feasible solution for the fracture failure problems of the level-type cartridge extractor.