The Output Forces portion of the Cut Section menu calculates the forces and moments acting on the current
current plane.
The
Write to File button will write the
forces and moments to a CSV file.
The Forces... button brings up a comprehensive table of cut section forces data, with options to write to Text, CSV, or XLSX file format.
A summary of the cut section centre coordinates and the current forces for the current direction tab can be shown in the panel if the check box there is ticked.
The values will update automatically as the section is dragged.
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Please read the following section on force and moment
extraction before using this facility. There are some less than obvious
pitfalls that you need to consider. In particular:
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Only
unblanked
elements are included
in cut section force calculation.
-
Any element types or parts
excluded from the cut section are not included in the force and moment calculation.
-
Rigid elements may be transmitting force, but they
will always report zero output to the database. Therefore their contribution
to cut forces and moments will always be zero.
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Forces and moments are only computed from Solids,
Beams, Shells and Thick shells. Other element types either do not report
forces (eg springs, seatbelts), or are not sensible in this context
(eg SPH elements).
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There are inconsistencies in the way Ansys LS-DYNA writes
beam force and moment output prior to LS971, requiring user intervention
if the correct answers are to be calculated.
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Local bending moments in thick shells are not included,
and may also be omitted for thin shells if force & moment resultant
data components are not present in the database.
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Ansys LS-DYNA processes cut-sections in "basic"
space, generating forces and moments in the global system. If you switch
to "basic" space in D3PLOT you will get a similar calculation,
but "deformed" space results in D3PLOT are expressed in the
plane's local system.
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