Plasticity computation in hydrocodes compared with analytical theory

Associated analytical plasticity theory is reviewed and compared with the approach to plasticity used in hydrocodes such as Autodyn and Dyna. In general, the two methods are seen to be quite different, but for certain special cases they agree. It is shown that analytical Prandtl–Reuss plasticity is equivalent to the plasticity model in Autodyn if a Mises strength model is combined with a linear equation of state, while the Autodyn Mohr– Coulomb strength model is very different from the analytical Mohr–Coulomb plasticity model.