Numerical Simulation for Explosion Shock Waves and Correction of Calculation Formula of Overpressure

The finite element model of TNT explosion was carried out by LS-DYNA,then the numerical results of air explosion were obtained.Comparing to the empirical formulae,the credibility of the calculation model and parameter selection was verified.On the basis of analysis results,the modified calculation method of the shock wave overpressure was proposed,in reference to the weighted average of the empirical formulae,the results of numerical simulation were modified.The research results show that:the common empirical formulae used before and the numerical simulation are in the lower median value and the lower limit value of the blast shock wave overpressure respectively,the risk of the blast shock wave overpressure are likely to be underestimated,but the modified shock wave overpressure based on the modified calculation method could be used as the median value of the blast shock wave overpressure.