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National Advisory Committee for Aeronautics, Technical Notes - Tensile Tests of Round-Head, Flat-Head, and Brazier-Head Rivets

An investigation gas conducted to determine the
tensile strength of round—head CAN430){'flat—head
(AH442), and brazier—head (AN455 and AN456) aluminum—
alloy rivets because of the scarcity of information on
the tensile strength of rivets. The results of the
investigation are presented as curves that show the
variation of the ratio of the tensile strength of the
rivet to the tensile strength of the rivet shank wi-th
the ratio of the sheet thickness to the rivet diameter
for the different types of rivet
Information on the tensile strength of rivets is
scarce, although it is known that, in many applications,
rivets are under tensile load, An investigation was
therefore conducted to determine the comparative tensile.
strengths of round-head (AN430), flat—head (AN442), and
brazier—head (AN455 and AN456) rivets. The tests were-
made with special fixtures designed to simplify the test—
ing procedure.
The specimens-used'in the tests each_cohsisted of
two sheets of 24S—T aluminum ailoy ofequalthickness,
riveted together with-a single_ AlVS—T aluminum—_alloy
rivet as shown'in figure 1' Round-hlead(AN430) flat—
head .zAN448'), a-nd brazier—head (AN455 and AN456) rivets
were used, In the'driving operation, a- vibrating gun ‘
was applied to the manufactured.head of the rivet while
the shank end was bucked with a bar.
The specimens were mounted for test in the fixtures
shown in figure 2. The small_rods on each of the fix—
tures pass through the holes in one of the sheets_of
the specimen and bear against the other sheet. When
load is applied; the rods push the sheets of the speci—
men apart. Loads were applied to the'specimens in a
hydraulic testing machine accurate within onenhalf of
1 percent. Maximum load and type of failure were re-
corded for each test.