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National Advisory Committee for Aeronautics, Technical Notes - Bearing Tests of Magnesium Alloy Sheet

Bearing tests of AM—SS, AM—SZS, and AM—C57S magnesiune_
alloy sheet in various_thicknesses and tempers were made.
Bearing yield and.ultimate strengths were determined and
compared for various edge distances and for various ratios
of loading—pin diameter to sheet thickness. Tensile
strengths were determined and ratios of average bearing
yield and ultimate strength to tensile strength are given;

The results of the tests indicated that ultimate 1,
bearing strengths increased with edge distances up to 1.5 “
to 2 times the diameter of the loading pin; that ultimate
bearing strengths are a function of ratio of pin diameter
to sheet thickness: that hearing yield.strengths generally
are not sensitive to ratios of pin diameter to sheet
thickness; and that these properties are effected only
slightly by increases in edge_ distance greater than 1. 5
diaLeters.

The increasing use of magnesium alloys in aircraft
construction has enphasized the need for more complete in—
formation regarding the mechanical properties of these
materials. The object of this investigation was to deter—
mine the bearing yield'and ultimate strengths of several ”' 7':
of the more common magnesium alloys and to establish, as '”"
far as possible, ratios of bearing values to tensile V _ _
strengths which may be used as a basis for design? This "“T
report includes_, in addition to data on bearing strengths,
the tensile .properties of the alloys investigated and_ some 1 “
data on compressive and shear strengths. __ _ “" -;?1“

Tests were made.of three magnesium alloys in the form
of sheet; AH—SS, AH—5BS, and AM—Q57S. All alloys were fur—
nished in —O and ~H.tempers in a nominal thickness of 0.064
inch, and in —R tempers-(between:—O and —H) in thicknesses
of O.l25 inch and 0.250 inch.

Table I gives the mechanical properties of the mate-
rials used. (See references I and 2.) Although not in—
cluded here, stress~strsin data were obtained in tonsiOn
for all the 0.064—inch sheet’fifid'in compression for all
three thicknesses of.sheet used. =These measurements indi—
cated an initisl linear stress~strain relationship in all
cases. Under some conditions of cold work On magnesium
alloys,-this type of stress—strain relation_is not obtained.
(See roferencc's.)