***save_energies

Description

This command indicates stores the elastic energy for output. The command is a bit simplistic, but extracts from the material the variable eel and returns

(218)\[{\tt sse} = \frac{1}{2}\ten \sigma:\ten \varepsilon_{el}\]

if \(\ten \varepsilon_{el}\) does not exist in the material (not normally the case for standard materials, but possible) an error will occur, and the option should be removed.