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National Advisory Committee for Aeronautics, Technical Notes - Plate Compressive Strength of FS-1h Magnesium Alloy Sheet and a Maximum Strength Formula for Magnesium Alloy and Aluminum Alloy Formed Sections

The plate compressive strength of FSalh magnesium-alloy sheet was
determined from local—instability tests of formed Z-section columns.
The critical compressive stress was found to correlate well with the.
compressive stress-strain curve for the material. The curves of average
stress at maximum load plotted against calculated elastic critical strain
resulted in a family of curves similar to previous results for aluminum-
alloy sheet.

An empirical female. was developed for calculating the average stress
at maximum load for formed Z-sectiorns and. channel sections of FS-lh
magnesium-alloy sheet and 2hS-T and_lTS-T aluminum-alloy sheet.

Recent investigations by the National Advisory Committee for
Aeronautics have provided-information on the plate compressive strength of
various aluminium andmagnesium alloys. From these investigations, the
buckling stress and average stress at maximum load have been quite well—
established for extruded alminum and. magnesium alloys. (See reference 1.)
For sheet materials, however, the plate compressive strength has not been
so general]: established. The only information available was obtained fmn
tests of formed Z.sections and channel sections of 178-53 and 2hS-T
aluminum-alloy sheet (references 2 and 3, respectively) and no data are
available for magnesium-alley sheet. Inasmch as the test results for
the aluminum-alloy sheet materials were essentially different from those
obtained for the extruded materials, particularly with regard to the
average stress at maximum load, additional information on the plate
compressive strength of sheet materials is 'required.

Because data on magnesium sheet were not available, experimental data
were obtained on the plate compressive strength of FS-lh magnesium-alloy
sheet. Results are presented for the buckling stress and the average
stress at maximum load for FS-lh magnesim—alloy formed Z-sections. The
results for the average stress at maximum load are also analyzed and
conmared with those obtained for almninJm—alloy sheet (references 2 and 3).