Fem Techniques in Shaped Charge Simulation

 

Marinko Ugrčić

Dušan Ugrčić

 

The method of shaped charge simulation based on the FEM techniques is presented. The earlier phases of shaped charge functioning include the initiation of detonation and detonation wave propagating along the explosive charge. After shaped charge jet and slag forming the phases of jet stretching and jet penetration follow.

The coupled FEM based on Eulerian-Lagrangian meshing was used to describe the phases of detonation wave propagating as well as the jet forming and jet stretching. But the Lagrangian meshing was used to describe the jet penetration, as the last phase of shaped charge functioning. During penetration very intensive erosion of jet material appears so that the eroded Lagrangian cells must be removed from the calculation. To correctly calculate the jet penetration, the coefficient of erosion was introduced in the FEM solver. The results of the experimental determination of jet erosion during penetration through a steel obstacle were presented. The examples of FEM simulation and the relevant results of the experimental testing of the 64 mm shaped charge jet forming and penetrating are shown as well.

Key words: shaped charge, shaped charge jet, jet forming, process simulation, numerical simulation, finite element method.