# UPON ANALITICAL AND NUMERICAL CALCULUS OF THE MAIN PARAMETERS OF THE DETONATION PROCESS

**Autor/autori**: Vasile NĂSTĂSESCU1,Ghiţă BÂRSAN

**Abstract**: This paper presents some results of scientific research undertaken by the authors, regarding the numerical modeling of the detonation process, both the Finite Element Method (FEM) and the method of free particles, in version of Smoothed Particle Hydrodynamics (SPH) method. After a synthetic presentation of detonation, as part of explosive process, whose parameters and effects must be known, the authors describe the fundamentals of the analytical calculus and approaching ways of the numerical analysis. So, Rankine-Hugoniot relations, Chapman-Jouguet and Zeldovich-von Neumann-Doering theories and equations of state of explosives during the energy conversion process, are successively presented. The paper continues with numerical modeling using MEF in several variants of the mesh, using several equations of state and varying a number of parameters in the initial data characteristics of explosives. Concrete examples are considering two explosives: TNT and PETN. The main parameters analyzed are the pressure and the detonation speed together with their variation in time and in space. The analysis of the above parameters is made in the context of the key input process, a particular concern of the influence of the pressure and velocity at the Chapman-Jouguet point of balance and the internal specific energy of explosive upon the pressure and detonation velocity

**Keywords**: explosive, modeling, finite elements, detonation velocity, detonation pressure