|CONVAIR-RP-8926-128 Material - Nickel Base Alloy - Monel Metal; Countersunk Rivet Shear Strengths.pdf||Download|
Material - Nickel Base Alloy - Monel Metal; Countersunk Rivet Shear Strengths
Abstract : ultimte and yield strength of Mlb27 Monel metal 5/32 and 3/16 inch diaæter rivete driven 'into various thickneeeee of 6Al-lV alloy sheet were determined. NVet installations In sheet thicker than 0.060 Inch failed by rivet Bhear. hoee åclnts which contained sheet •term of lees than 0.060 Inch thickneee failed by tear—out or under the rivet. me ultiute and yield of those rivete which failed in shear vere: 3/16 Inch dlaæter, 1781 and lbs. respectively; and 5/32 Inch diaæter, 1590 and 1985 lbs. respectively. Reference: Neary, J. K. , H. A. , Wise, W. E. Rivet - "chine %untergunk in Titanium Sheet - UltiNte Shear n Dynam1cB/Conva1r Report 57-651, Diego, California, 10 June 1958 attached).
The higher performance characteristics of modern aircraft necessitates aerodynamically clean skin surfaces. In the past , countersunk rivet Installations in thin sheet thicknesses were made by dimpling, a method which produced uneven skin surfaces. In an attempt to produce smoother skin surfaces dimpled rivet installations are being replaced with countersunk instafr at ions. Since the thin skin thicknesses now being countersunk are less than the minimum allowable per present installation specifications , allowable rivet loads are not available for structural desigi. QUEE: The object of this test is to determine the design allowable load Of AN 427 mmel rivets in machine countersunk titanium sheet. CONCLUSIms: Desigl ultimate shear loads for AN 427 monel rivets in machine cmmtersunk titanium sheet, are as follmgs:
TEST SPECIWIEN: Test specimens were riveted lap joints, two rivets at each joint, using AN 427 MC monel rivets in machine countersunk, mill annealed, 6 Al — LV titanium sheet. Specimen dimensions and rivet spacing are in Table I and Figure 1 respectively. Specimens having skin thichess legs than the .06C minimum, per Q 2001, were countersunk to the depth necessary to maintain the specified countersink diameter. This resulted in the countersink projecting through the top and into the bottom sheet, greatly reducing the bearing area.