CAJ | 학술논문

研究端部起爆下不同空腔直径装药的爆轰输出特性及对杆条驱动特性的影响。采用非线性动力学软件 LS-DYNA，运用流固耦合算法，对不同空腔直径装药下离散杆的爆轰驱动过程进行数值模拟，分析空腔直径大小对爆轰产物压力分布、离散杆速度与微元速度分布以及离散杆变形的影响。仿真结果表明，随着空腔直径的增大，空腔内稀疏效应逐渐增强，使得爆轰输出压力沿轴向趋同；杆条速度随空腔直径的增大非线性减小，杆条微元速度梯度逐渐减小；空腔直径越大，杆条平直度越好，而杆条平直度与杆条速度呈反向变化规律，因此离散杆的最优作用效果要综合权衡飞散速度与平直度。
연구단부기폭하불동공강직경장약적폭굉수출특성급대간조구동특성적영향。채용비선성동역학연건 LS-DYNA，운용류고우합산법，대불동공강직경장약하리산간적폭굉구동과정진행수치모의，분석공강직경대소대폭굉산물압력분포、리산간속도여미원속도분포이급리산간변형적영향。방진결과표명，수착공강직경적증대，공강내희소효응축점증강，사득폭굉수출압력연축향추동；간조속도수공강직경적증대비선성감소，간조미원속도제도축점감소；공강직경월대，간조평직도월호，이간조평직도여간조속도정반향변화규률，인차리산간적최우작용효과요종합권형비산속도여평직도。
By changing hollow diameter of cylindrical charge with one end initiation,its detonation output characteristics and influences on driving characteristics of a discrete rod were studied.Numerical simulations of discrete rods'detonation driving processes were performed with the nonlinear dynamic analysis program LS-DYNA and the fluid-solid interaction method.The influences of different hollow diameters on pressure distribution of detonation products, velocity,micro-unit velocity distribution and effective length of discrete rod were analyzed.The simulation results showed that with increase in hollow diameter,gradually enhanced sparse effects make the pressure along the axial direction tend to the same;the resultant velocity of the discrete rod decreases nonlinearly with increase in hollow diameter and the micro-unit velocity gradient also decreases;the larger the hollow diameter,the better the flatness of the rod,while the flatness has a reverse variation to the velocity of the rod;so the optimal effect of the discrete rod should consider the balance between its velocity and flatness.