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中文摘要：
为描述多层球形预制破片战斗部破片的初速分布,针对典型的柱形装药的多层球形破片结构,用AUTODYN软件对其爆炸驱动过程进行数值模拟,发现每层破片的初速周向规律性波动;每层破片的平均初速外层大于内层,其差异随破片层数的增多和周向破片数的减少而增大;基于Gurney假设和冲量定理进行理论推导,结合数值模拟结果,建立了破片初速场的计算模型。该模型通过给出各层破片的平均初速及初速场的速度极值来表征初速场,其计算值与实验结果吻合较好。
英文摘要：
In order to predict the initial velocity of multilayered spherical fragments warhead in detail,AUTODYN was utilized to simulate the process of explosively drive aimed at the typical warheads,filled with cylindrical charge and multilayered spherical fragments. It＇s found that velocities of fragments varied regularly in circumference on each layer and the mean velocity of inner fragments is bigger than that of outer fragments,especially in the case of more layers and less circumferential fragments. Then,a model was established by theoretical derivation based on momentum theorem and Gurney＇s hypothesis as well as the data from simulation. The model gives three types of velocity to characterize the initial velocity field. The three types of velocity is as follows： average initial velocity of fragment in any layer,maximum and minimum initial velocity of fragments. The results predicted by the model go well with test results.
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