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NATIO03NAL ADVISORY COMMITTEE 10 A3fRONAUT I0S
RUSTRIOTD BULLT IN            -
T3ST DATA 0 NTH  SHBEAR STRNGTI 07' JOINTS ASSEMBLD
WITH ROUND-41AD AND BRA324I-HEAD RI ITS
-By Herven N. Mandel and  van H. Schuette
A series of load-displacement curves obtained. from
tests in shear of joints riveted with round-head (AN430)
and brazier-head (AN455) rivets is presented. a set of
curves is also presented comparing the tightness of the
two types of rivet for one value of rivet diameter. The
specimens used in these tests consisted of two sheets of
24S--T aluminum alloy riveted together in the form of a
lap joint with two A 17S-T aluminum alloy rivets, as shown
in figure 1. The round or brazier head of the rivet was
driven with a vibrating gun while the shank end was bucked
with a bar.
Loads were applied to the specimens through Templin
grips with a hydraulic testing machine accurate within
one-half of 1 percent. Displacements of one sheet with
respect to the other were measured on the edges of the
sheets opposite the center of the riveted joint by means
of two 18-power microscopes with filar micrometers. Both
the displacement under load and the permanent displace-
ment after removal of the load were measured for succes-
sively increasing loads until failure occurred.
RESULTS
The load-displacement curves were plotted for all
specimens tested.. (See figs. 8 to 6.) The shear loads
per rivet corresponding to permanent displacements of O.01&,
0.02d, O.03d, O.04d, and 0.05d, where  d   is rivet diam-
eter, were determined from these curves and are listed in
table I.
figure 7 shows a comparison of the load at various
values of permanent displacement for 1/8-inch-diameter
roud-head and brasier-head rivets, The value of load at
a given value of permanent displacement provide a measure
of the tightness of the joint. Figure 7 therefore indicates