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Test Data on the Shear Strength of Joints Assembled with Round Head and Brazier Head Rivets

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~ha1f 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 lB—power microscopes with filar micrometers. Both_-
the displacement under load and the permanent displace—
ment after removal of the load were measured for succesi
sively increasing loads until failure occurred.

RESULTS

The load—displacement curves were plotted for all
specimens tested. (See figs. 2 to 6.) The shear leads
per rivet corresponding to permanent displacements of 0.01d.
0.02d, 0.03d, 0.04d, 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 l/B—inch—diamster
round-head and brazier—head rivets. The value of load at
a given value of permanent displacement provides a measure
of the tightness of the Joint. Figure 7 therefore indicates
2

that, for sheet thicknesses of 0.064 and 0.081 inch. the
use of 1/8—inoh brasier—head rivets produces a tighter
Joint in shear than does the use of l/B—inoh round—head
rivets. For a sheet thickness of 0.025 inch,“the round—
head rivets are tighter than the brasier—head rivetsg
For sheet-thicknesses.of 0.032 and 0.040 inch, the two
types of rivet are of about equal quality with regard to
tightness.- No comparative tests.iere made with sheet
thicknesses less than 0.025 inch or greater than 0,081
inch, or with rivets of diameters other than 1/8 inch.