*Source*:- Owen and Hinton, (1986),
*Finite Elements in Plasticity*, Pineridge Press. *Description*:- Subroutines and driver programs for non-linear elastic, elasto-plastic and elasto-viscoplastic problems, both static and dynamic.
*Availability*:- The Fortran source code is also available on diskette from the publisher (£500).
*Notes*:- In one dimension the following problem types can be solved (a) non-linear quasi-harmonic problems (solution either by direct iteration or by Newton-Raphson iteration); (b) non-linear elastic, elasto-plastic and elasto-viscoplastic problems; (c) non-layered or layered elasto-plastic analysis of Timoshenko beams. In two dimensions the static problem types are (a) elasto-plastic and elasto-viscoplastic analysis of plane and axi-symmetric solids; (b) non-layered/layered elasto-plastic analysis of Mindlin plates. The two dimensional dynamic problem types involve two-dimensional plane stress/strain and axi-symmetric non-linear dynamic transient analysis (a) DYNPAK small/large elastic deformation or small elasto-viscoplastic deformation with explicit central-difference time integration; (b) MIXDYN small/large deformation elastic or small deformation elastic-plastic (Tresca, Von Mises, Drucker-Prager, Mohr-Coulomb) and a choice of time integration algorithm (explicit, implicit, combined implicit-explicit). Flow diagrams and solution algorithms are included in the text.

Roger Young and Ian MacPhedran