基于ANSYS/LS-DYNA的工业炸药材料参数标定方法

Parameter Calibration Method of Industrial Explosive Material based on ANSYS/LS-DYNA

在岩石爆破数值模拟研究中,需要准确描述爆轰产物膨胀做功过程,快速准确地确定JWL状态方程参数十分重要。采用了理论计算与数值模拟相结合的方法,提出一种基于ANSYS/LS-DYNA有限元软件的工业炸药材料参数标定方法。以工程中常见的2#岩石乳化炸药为例,根据炸药产品说明书上的密度及爆速,应用一种简便算法计算得到JWL状态方程未知参数。在此基础上,对铅柱压缩实验、铅铸扩孔实验进行数值模拟,通过两种不同的实验检验计算参数的准确性。采用正交试验的方法研究了JWL状态方程中的4个重要参数A、B、R_(1)、R_(2)变化对于数值模拟结果的影响,确定了以爆力、猛度指标为标准的计算参数修正方法。参数修正后,数值模拟结果与现场实验结果误差不超过5%,说明标定方法可行。

In the numerical simulation of rock blasting,it is very important to accurately describe the work process of expanding detonation products and to determine the parameters of JWL equation of state(Eos)quickly and accurately.A parameter calibration method of industrial explosive material is proposed which is based on ANSYS/LS-DYNA finite element software by combining theoretical calculation with numerical simulation.Taking 2#rock emulsion explosive as an example,which is common in engineering,the unknown parameters of the JWL Equation of State(Eos)were calculated by a simple algorithm according to the density and detonation velocity explosive product manual.On this basis,the numerical simulation of lead column compression experiment and lead casting reaming experiment was carried out,and the accuracy of the calculation parameters was verified by two different experiments.The influence of the changes of four important parameters A,B,R_(1) and R_(2) in JWL equation of state(EOS)on the results of numerical simulation was studied by means of orthogonal tests.After the parameter correction,the error between numerical simulation results and field experiment results was less than 5%,indicating that the calibration method was feasible.