nodal stresses/strains are not calculated for solid elements

[SteveDoyle2]

This should be a pretty straightforward recovery given the stresses should be calculated at the integration points exactly. Stresses should then be extrapolated to the nodes. Not having this makes the stresses artificially low.

I don't know what the order of the polynomials is for the different elements (CTETRA, CPENTA, CHEXA) or if it changes based on the number of nodes/integration method, but hopefully wherever the centroidal stress is calculated, there's a pretty straightforward recovery step that can be easily extended.