摘要
为深入研究柔性导爆索在爆炸分离装置中的作用过程和机理,提出一种改进的光滑粒子流体动力学方法(smoothed particle hydrodynamics,SPH)与有限单元法(finite element method,FEM)耦合算法。新方法中不仅包含导爆索模拟的SPH方法与分离装置模拟的FEM方法之间的接触算法,同时将完全损伤失效后的单元采用转化算法动态转化成SPH粒子继续参与计算,转化后的粒子与未转化的有限单元之间采用接触算法计算。采用该方法对环型和平板型两种爆炸分离结构的分离过程进行了数值模拟,验证了新方法的准确性与问题适用性;分析了分离板的变形断裂及损伤碎片的飞溅过程,得到了分离装置表面不同时刻的应力分布、损伤因子的变化趋势、von Mises应力的变化趋势;探讨了炸药在不同比内能情况下单元的屈服损伤速度、碎片的飞溅位移速度。
Mild detonating fuse(MDF)explosive separation device is a widely used explosive separation device because of its relatively easy processing,simple structure,low cost and high reliability.In order to further study the action process and mechanism of flexible detonating cord in explosive separation device,an improved coupling algorithm of smooth particle hydrodynamics(SPH)and finite element method(FEM)is proposed in this paper.The new method is not limited to the contact algorithm between SPH method for MDF simulation and FEM method for separation device simulation;the element after complete damage failure is dynamically transformed into SPH particle by the transformation algorithm to continue its participation in the calculation,and the contact algorithm is used to calculate the relationship between the transformed particle and the untransformed finite element.By using this method,the separation process of two kinds of explosive separation structures with ring and plate shape is numerically simulated,and the accuracy and validity of the new method are verified.Then,the deformation and fracture of the separation plate and the spatter process of damage fragments are analyzed,while the stress distribution of the surface of the separation device at different time,the change trend of damage factor and the change trend of von Mises stress are obtained.Moreover,the yield damage velocity of the element and the spatter displacement velocity of fragments under various pecific internal energy of explosives are discussed.The results show that the stress at the weakening groove on the surface of the separation device is the largest,and the elements near the surface yield first;the von Mises stress shows an oscillating upward trend with time;with the increase of the initial specific internal energy of explosive,the yield damage speed of the element and the splash displacement speed of the fragments increase significantly.
作者
史腾达
陈福振
严红
刘虎
SHI Tengda;CHEN Fuzhen;YAN Hong;LIU Hu(Taicang Yangtze River Delta Research Institute of Northwest Polytechnic University,Suzhou 215400,Jiangsu,China;School of Power and Energy,Northwest Polytechnic University,Xi’an 710025,Shaanxi,China;Beijing Institute of Aerospace Systems Engineering,Beijing 100076,China)
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2022年第11期37-50,共14页
Explosion and Shock Waves
基金
国防基础科研计划(JCKY2019607B001)
国家自然科学基金(11902267)
江苏省自然科学基金(BK20201203)。
