Moment of inertia different from CAE and .dat file

[faraz_hussain]

I have a really simple rectangular beam with hex elements. The moment of inertia reported in the .dat file is off by 0.1-0.5% compared to the CAE calculations. The CAE calculations match the hand calculations exactly. Could it be roundoff error? Or is Abaqus standard calculating inertias differently than CAE?

[Dave Lindeman]

Most likely, ABAQUS/CAE is calculating the mass properties directly from
the solid model, whereas Standard is calculating the value using the
finite elements.

Regards,

Dave

-------------------------
Dave Lindeman
Lead Research Specialist
3M Company
3M Center 235-3F-08
St. Paul, MN 55144
651-733-6383


faraz_hussain wrote:
>  
>
> I have a really simple rectangular beam with hex elements. The moment of
> inertia reported in the .dat file is off by 0.1-0.5% compared to the CAE
> calculations. The CAE calculations match the hand calculations exactly.
> Could it be roundoff error? Or is Abaqus standard calculating inertias
> differently than CAE?
>
>

[faraz_hussain]

I am actually using a model with no geometry in CAE. So CAE only has the finite elements to base it's calculations off of.

--- In Abaqus@..., Dave Lindeman <ddlindeman@...> wrote:

>
> Most likely, ABAQUS/CAE is calculating the mass properties directly from
> the solid model, whereas Standard is calculating the value using the
> finite elements.
>
> Regards,
>
> Dave
>
> -------------------------
> Dave Lindeman
> Lead Research Specialist
> 3M Company
> 3M Center 235-3F-08
> St. Paul, MN 55144
> 651-733-6383
>