D assembly FE modeling and dynamic elastoplastic analysis are carried out for the obturator structure of a floating gun breech mechanism by using nonlinear finite element code MSC MARC.

• 利用大型非线性有限元MARC,对某自动迫击炮浮动炮闩闭气结构,进行了三维装配体有限元建模和动态弹塑性分析,获得了关键闭气构件的应力、塑性应变和变形的动态响应。