AN ANALYSIS BY DIRECT NUMERICAL-SIMULATION OF THE EFFECTS OF PARTICLEMORPHOLOGY ON THE SHOCK COMPACTION OF COPPER-POWDER

Shock processing consolidates powders at high dynamic pressures over a very short time span. In contrast to conventional sintering, the temp erature distribution in the particles is not uniform. The temperature increase at a material point is caused by the mechanical work associat ed with the compression and plastic flow of the material. A numerical study of the effects of the particle morphology on the plastic flow, a nd, hence, the final temperature distribution in a powder, is presente d. The accuracy of the numerical calculations is validated by comparin g the calculated shock velocity-particle velocity relationship to a le ast-squares fit of experimental data.