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A limited series of tests has been carried out on
single and double shear riveted joints using 1469 (D.T.D.327)
snap head rivets and L.72 (D.T.D.610) and L.73 (D.T.D. 546)
sheets. The specimens were similar to those used by the
Royal Aeronautical Establishment (ref.1), the double shear
specimens being essentially two single shear specimens placed
back to back.
In each case the 1 per cent, 2 per cent and ultimate
strengths were found, the single shear values being in agreement
with the equivalent R.A.E. tests (ref. 2).
It was found that at high bearing stresses the
permissible shear stress in the double shear joint falls
below that of the single shear joint having the same nominal
bearing stress, This reduction of permissible shear stress
was found to increase with joint extension and to be
independent of the sheet materials tested. Design curves
are given. |
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