【摘要】 为研究壳体结构对燃料近区抛撒速率的影响,利用LS-DYNA程序,分别对无加强杆结构和有加强杆结构的中心抛撒药驱动燃料抛撒和壳体破坏过程进行数值模拟,并与试验结果进行了对比,得到了燃料边界初始膨胀状态、壳体破裂过程和刻槽应力随时间变化的规律,以及不同结构对燃料抛撒最大速率的影响。研究结果表明:在满足结构强度的要求且径向强度相同的情况下,加强壳体的轴向拉力,能够有效提高燃料抛撒速率;在相同的中心药量/燃料量的情况下进行抛撒,当轴向拉力提高0.7×106N时,有加强杆结构较无加强杆结构有利于获得较大的抛撒速率,有加强杆结构的燃料最大抛撒速率可达316.3 m/s,无加强杆结构的燃料最大抛撒速率为285.3 m/s,燃料抛撒最大速率提高了10.8%.更多还原

【Abstract】 In order to study the dispersal characteristics for different shell structures,the processes of fuel dispersion and shell breakage driven by central explosive are simulated by LS-DYNA code,and the simulated and experimental results are compared. The boundary expansionstate of fuel and the process of shell breakage are obtained. The variation of cutting force with time and the maximum dispersing velocity of different shell structures are analyzed. Results show that the dispersing velocity of fuel could be effectively increased by enhancing the axial tension while satisfying the structural strength and the same radial strength. When axial tension is up to 0. 7 × 106 N,the greater dispersing velocity could be produced by stiffener structure. The maximum dispersing velocity of non-stiffener structure is 285. 3 m/s.The maximum dispersing velocity of stiffener structure is 316. 3 m/s,that could be increased by 10. 8 %with the same dose for non-stiffener structure.更多还原