为了研究低温发射药粒在冲击载荷作用下的力学性能,用一种建立在非连续介质基础上的离散单元法为工具,建立了发射药粒的破碎模型,采用Mohr Coulomb型的破坏准则,数值仿真了发射药粒以不同初速冲击刚性界面的破碎过程.定性研究了低温发射药粒在冲击载荷作用下的力学性能.分析结果表明,冲击速度越大,发射药粒的破坏情况越严重,该结果与试验相符.该文方法为发射药粒破碎过程研究提供了一种新途径.
Abstract
In order to obtain the mechanical property of propellant grain under low temperature and impact load, discrete element method was applied, and based on non continuum medium, the fracture model of propellant grain was established. Fracture rule of propellant grain was the rule of Mohr Coulomb. The fracture process of propellant grain impacting rigid wall with different velocities was simulated. The mechanical property of propellant grain under low temperature and impact load was qualitatively analyzed. The analysis result shows that the higher the impact velocity, the more serious the fracture of propellant grain is, and the result agrees with experiment. The method offers a new way for studying the fracture process of propellant grain.
关键词
发射药 /
离散单元法 /
冲击破碎 /
动力学仿真
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Key words
propellant /
discrete element method /
impact and fracture /
dynamic simulation
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