【摘要】 发射药床的碰撞、挤压引起药粒破碎是导致膛炸的根本因素。首先用Monte Carlo模拟密实发射药床初始堆积结构,然后引入一种建立在非连续介质基础上,又区别于一般多体动力学方法的离散元法,来模拟密实的发射药床在膛内高压条件下的碰撞、挤压的动力学过程。详细介绍了离散元法计算程序核心——接触寻找算法,以及药粒的三维接触模型和计算参数的确定。首次解决了复杂条件下的单个药粒受力和运动无法描述的问题,为药粒的破碎数值模拟奠定重要基础。更多还原

【Abstract】 The propellant failure caused by collision and press of propellant bed is the fundamental reason of breech-blow.The initiating stacking structure of dense propellant bed was simulated by Monte Carlo method.The collision and press process of dense propellant bed was simulated by discrete element method,which is different from common multi-body dynamics on the basis of introduced non-continuum. Propellant’s contact detection,3-D contact model and determination of computational parameters were explained exactly.This scheme firstly solves the problem of force and motion acting on single grain under complex conditions and plays an important role in simulating propellant failure.更多还原