ISOGRID-SST™
Typical Results
ISOGRID-SST™ outputs include numerous graphical and alpha numeric
results. Typical inputs are geometry, clearance envelopes, material properties, knockdown factors,
margins of safety, design criteria, minimum gauges and
manufacturing tolerances.
Some ISOGRID-SST™ generated results are reviewed here.
Cross section properties
Elastic skin buckling, which reduces effective skin in the rib cross section,
is an allowable ISOGRID-SST™ design criteria, albeit that structural
performance is reduced due to the reduction in effective rib cross section
properties.
In converging on a final design, ISOGRID-SST™ selectively evaluates minimum, average and maximum
manufacturing tolerances. The minimum gauges (due to maximum tolerances)
are not always the most critical. In some cases the
maximum gages (due to minimum tolerances) attract undesirably high internal loads.
ISOGRID-SST™ evaluates such conditions in developing optimum structural
design definition parameters.
ISOGRID-SST™ selects optimum design parameters by maximizing the margin floors for
such failure modes as rib, skin and flange buckling. This process is repeated for
all loading conditions to generate an optimum
design definition.
Outputs can be in either English or SI units.
Summary of element numerical data.
The following is an example of ISOGRID-SST™ alpha numeric results.
Applicable margins are summarized at the bottom of the chart.
ISOGRID-SST™ also produces such results for un-flanged isogrid,
flanged and un-flanged waffle, honeycomb, skin stringer, monocoque and other
structures. In all cases multiple loading conditions may be applied and
typically several failure margins are evaluated to synthesize optimum design
definitions.
