As far as I am aware LS-DYNA only supports 8 node hex elements (as of version 970 anyway). The constant stress hex element is an 8 node under-integrated element. Looking at the *SECTION_SOLID entry in the manual there is a quadratic element, the higher order is achieved through including nodal...
I agree with Thomas,
Length unit: mm
Mass unit: tonne
Time unit: s
1 force unit = tonne x mm / s^2 = 1N
1 work unit = N x mm = 1E-3 J
1 stress unit = N / mm^2 = 1E6 Pa
1 density unit = tonne/mm^3 = 1E-12 kg/m^3
etc.
Now I have to hope I'm corrrect.
Eser, I assume that this is a set of units...