Equation Of State And Strength Properties Of Selected

This article outlines the EOS and strength properties of selected materials to highlight the distinct mechanisms of compaction and plasticity.

The isothermal EOS is often described by the (finite strain theory): equation of state and strength properties of selected

Aluminum is a standard lightweight structural material with high ductility. This article outlines the EOS and strength properties

The interplay between these two is most visible in shock compression. When a shock wave hits a solid, the total stress is the sum of the hydrostatic pressure (from the EOS) and the deviatoric stress (from the strength model). At low pressures, the material's strength is significant; the "Hugoniot Elastic Limit" (HEL) marks the highest stress a solid can withstand before it begins to flow like a liquid. Beyond the HEL, the material enters a plastic state, and as the shock pressure increases into the megabar range, the strength becomes negligible compared to the pressure, and the material's behavior converges toward the EOS prediction. When a shock wave hits a solid, the

$$\sqrt\frac32 S_ijS_ij \leq Y$$