Engineering & Analysis Methods > Miscellaneous Analysis & Methods

Design-to-Loads and Object Loads

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James:
The FBD tab and the design-to loads tab should stay in-sync. Something that may cause these two forms to report different moments is if you change the reference plane and don't immediately reanalyze. Can you try to reanalyze the component? Do the FBD tab and Design-to loads tab still show different moments? If so, can you send the database?

-James

Ruben:
James,

Rather than email you the database and results, I've attached a text file of an example panel and tell you how I analysed the data.

Perform a NASTRAN analysis on the file.
Create a new HyperSizer 6.4 database.
Preferences / Analysis Defaults: Limit 0.667, Ultimate 1.0, FEA Stat Method = 2 sigma.
Change Units to SI, so Weight in kg, Length in mm, Force in N.
Import FEM.
In the Sizing Form, create a new group in the Unstiffened Family.
Add the Component to the Group Membership.
In the Concepts tab, deselect Honeycomb and Foam.
In the Variables tab, for the Top Face, set Min=2, Max=25, Perm=47.
Select the "Al 2024" material.
Perform the analysis.
The component result should be 16.5.

The FBD data is for BUCKLING and is equal to the Buckling Load Set Controlling Unfactored on the Design-to Loads tab. Object Loads are equal to the STRENGTH case.

Now change the Reference Plane in the Options tab to 'Top' and Analyze.

The FBD momemt terms are at the same as before, so not transformed to the reference plane.
The moment terms on the Design-to Loads tab for the Buckling Load Set Controlling Unfactored are different.
The moments on the Object Loads are also different as these are now at the centre of the Reference Plane, and these are correct.

Regards,
Ruben

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