Comparison between analytical shock mechanic solutions and numerical solutions from the autodyn hydro code

Abstract

Numerival codes, i.e. Autodyn are widely used for simulations purpose during impact and penetration of prosjectiles into targets. To check the validity of the simulations during shock compression we first study the axiomatic structure of the analytical shock mechanics mor slosely. Thereafter the analytical results are compared with results from the simulations furing a onedimensional planar situation. By comparing the analytical shock solutions with the Autodyn solutions, we find that the density, pressure and shock velocity are in good agreement with the results from the analytical theory. But, we find that the energy at the reat of the shock show deviations from the analutivla rwatults. The reasjon for this is probably related to the use of artificial viscosity inherent in the Autodyn codes. The use of the Autodyn hydro code for shock impact problems where the temperature or the energy is important can therefore be questioned.