点火增长反应速率方程在LS-DYNA软件中嵌入及应用

为了得到能够正确描述炸药的冲击起爆过程且易于标定的反应速率方程，将一种点火增长反应速率方程嵌入LS-DYNA软件，并模拟DNAN基熔注炸药的冲击起爆过程。通过对比计算压力曲线和实验压力曲线标定这种点火增长反应速率方程参数，进一步分析在LS-DYNA软件中嵌入点火增长反应速率方程的优点。结果表明：这种点火增长反应速率方程参数较少、易于标定；计算得到的4个传感器位置处冲击波到达时间与实验值相差不超过0.2 μs，该反应速率方程能够正确描述炸药的冲击起爆过程；反应速率方程嵌入LS-DYNA软件所采用的算法效率高，计算中每个网格的迭代次数不超过3次。

Implantation and Application of Ignition and Growth Reaction Rate Equation in LS-DYNA Software

An ignition and growth reaction rate equation with 10 parameters is implanted into LS-DYNA software to precisely describe the shock initiation of explosives and simplify the calibration of reaction rate equation. The reaction rate equation is used to simulate the shock initiation of a DNAN-based melt-cast explosive. The parameters of the reaction rate equation are calibrated by comparing the pressure-time curves in experiment and simulation, and the advantages of the reaction rate equation are analyzed. The results indicate that the reaction rate equation can be easily calibrated due to a few number of parameters. The difference between the simulated and experimental arrival times of shock wave does not exceed 0.2 μs, and thus the reaction rate equation can be used to precisely describe the shock initiation of explosives. The algorithm for implanting the reaction rate equation in LS-DYNA software is efficient because the iterations for every grid does not exceed 3 times.