In this paper,the influences of bore damage on the bullet-barrel interaction process and the mechanism of how bore damage results in the end of a machine gun barrel’s service life were studied,which had seldom been p...In this paper,the influences of bore damage on the bullet-barrel interaction process and the mechanism of how bore damage results in the end of a machine gun barrel’s service life were studied,which had seldom been paid attention to in the past several decades.A novel finite element mesh generation method for the damaged barrel and a new transient coupled thermo-mechanical finite element(FE)model,which were based on the damage data obtained through barrel life tests,were developed to simulate the interior ballistics process of a coupled bullet-barrel system.Additionally,user subroutine VUAMP was developed in the FE model in order to take the bullet base pressure brought by propellant gas into account.Good consistency between the simulation results and the experimental results verified the preciseness of the proposed mesh generation method and the FE model.The simulation results show that the increase of bullet’s initial disturbance at the muzzle and the variation of its surface morphology caused by bore damage are primarily responsible for the life end of this 12.7 mm machine gun barrel.展开更多
对某型筒装导弹的贮存薄弱环节进行分析,并建立影响导弹贮存可靠性的故障树。利用现有的加速寿命试验模型对导弹关键部件进行加速寿命试验,其基本任务就是通过试验对模型参数进行辨识,加速模型包括:Arrhenius模型、逆幂律(Inverse Power...对某型筒装导弹的贮存薄弱环节进行分析,并建立影响导弹贮存可靠性的故障树。利用现有的加速寿命试验模型对导弹关键部件进行加速寿命试验,其基本任务就是通过试验对模型参数进行辨识,加速模型包括:Arrhenius模型、逆幂律(Inverse Power Law,IPL)模型、单应力Eyring模型,以及广义Eyring模型。展开更多
基金supported by the National Natural Science Foundation of China(grant number 11802138)the China Postdoctoral Science Foundation(grant number 2018T110503)the Fundamental Research Funds for the Central Universities(grant number 30918011302)
文摘In this paper,the influences of bore damage on the bullet-barrel interaction process and the mechanism of how bore damage results in the end of a machine gun barrel’s service life were studied,which had seldom been paid attention to in the past several decades.A novel finite element mesh generation method for the damaged barrel and a new transient coupled thermo-mechanical finite element(FE)model,which were based on the damage data obtained through barrel life tests,were developed to simulate the interior ballistics process of a coupled bullet-barrel system.Additionally,user subroutine VUAMP was developed in the FE model in order to take the bullet base pressure brought by propellant gas into account.Good consistency between the simulation results and the experimental results verified the preciseness of the proposed mesh generation method and the FE model.The simulation results show that the increase of bullet’s initial disturbance at the muzzle and the variation of its surface morphology caused by bore damage are primarily responsible for the life end of this 12.7 mm machine gun barrel.
文摘对某型筒装导弹的贮存薄弱环节进行分析,并建立影响导弹贮存可靠性的故障树。利用现有的加速寿命试验模型对导弹关键部件进行加速寿命试验,其基本任务就是通过试验对模型参数进行辨识,加速模型包括:Arrhenius模型、逆幂律(Inverse Power Law,IPL)模型、单应力Eyring模型,以及广义Eyring模型。
