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When creating a plsolid property using simple material constant entry,
the volumetric distortion constant (D1) has units of force/area.
When creating a general hyperelastic material the D constants have area/force
units. Which is correct and why is there an inconsistency?
Solution
For NX Nastran you enter the volumetric constants for both material methods
directly in units of force/area, ignoring the units specified on the simple
material constant form.
Other solvers such as Abaqus require the inverse value in units of area/force.
The NX CAE development staff is still deciding how to make the user interface
more consistent, given the inconsistency in various solver requirements.
Notes