多级推杆缓冲仿真与试验研究  

Simulation and experimental study on buffer of multistage cylinder

作　　者：刘旺 郭锦炎[1] 张筱[1] 周峤 张国栋[1] 邢春鹏 贾延奎[1] LIU Wang;GUO Jinyan;ZHANG Xiao;ZHOU Qiao;ZHANG Guodong;XING Chunpeng;JIA Yankui(Beijing Institute of Space Launch Technology,Beijing 100076,China)

机构地区：[1]北京航天发射技术研究所,北京100076

出　　处：《西北工业大学学报》2021年第S01期17-21,共5页Journal of Northwestern Polytechnical University

摘　　要：针对多级推杆运动过程中推杆级间缓冲问题,提出了一种基于有限元动力学仿真的推杆级间缓冲仿真方法。该方法将外径6 mm,壁厚为1 mm的304不锈钢作为级间缓冲材料,通过调整304不锈钢的本构模型并结合试验验证,获得304不锈钢在冲击力作用下的最优本构模型。通过该方法并结合试验验证,研究了304不锈钢的本构模型对级间缓冲效果的影响规律。结果表明,304不锈钢的MTS(Mechanical Threshold Stress)本构模型与试验吻合情况较好,将其应用于多级推杆级间缓冲中,可极大地降低级间缓冲载荷。In order to reduce the impact force of multistage cylinders,a simulation method of the buffer between multistage cylinders based on finite dynamic simulation is proposed.In this method,304 stainless steel is used as buffer material,and the optimal constitutive model of buffer material is obtained by various kinds of constitutive models.Then the obtained constitutive model is imported to the simulation method,and effect of the constitutive model of 304 stainless steel on buffer is studied by means of simulation and experiment.Results show that the elastic-plastic constitutive model of stainless steel is in good agreement with the experimental results.This model may provide some guidance for reducing the impact force of multistage cylinder,and the application of stainless steel to multistage cylinder can greatly reduce the buffer load.

关 键 词：多级推杆 缓冲 本构模型 304不锈钢 

分 类 号：V553.1[航空宇航科学与技术—人机与环境工程]