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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
WAlwwm luwolr’rORIGINALLY ISSUED
June 1943 asRestricted Bulletin 3F21
TEST DATA ON THE SHEAR STRENGTH OF JOIIITSASSEMBLED
WITH ROUND-HEAD AND BRAZIER-HEAD RIV%I?S
By Merven W. Ma.ndeland Evan H. Schuette
Langley Memorial Aeronautical LaboratoryLangley Field, Va.
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WASHINGTON
NACA WARTIME REPORTS are reprints of papers originally issued to provide rapid distribution ofadvance research results to an authorized group requiring them for the war effort. They were pre-viously held under a security status but are now unclassified. Some of these reports were not tech-nically edited. All have been reproduced without change in order to expedite general distribution.
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https://ntrs.nasa.gov/search.jsp?R=19930093095 2019-12-30T18:25:12+00:00Z
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EATIOIT&T ADVISORY COMMITTEE 10R AERO19AUTICS
RESl!RIOl?lUlBUIIL~TIE ~--.,...,,,. . . . -. ... .... .... . - . .. .-
TEST D&l!A ON THE SHEAR S9!RE19GTH 03’JOINTS ASS~MBti
“WITH ROUND-HUD AED BIl~IEE-HEAD RIVETS
By Herven M. liandel and llvan H. Scihuette.
A series of load-displacement curves ohtalned fromtests In shear of “jointe riveted with round-head (AM430)and brazier-head (A19455) rivets te presented. A eet ofourvos Is also presented oomparing the tightness of thetwo t~pee of rivet for one value of rivet diameter. Thespecimens used in these tests consisted of two sheets of24S-9 alumlnum alloy riveted together in the form of alap joint with two A 175-T aluminum alloy rivets, as shownin figure 1. The round or brazier head of the rivet wasdriven with a vibrating gun while the shank end was buckedwith a bar.
Loads were applied to the specimens through !l!empllngrips with a hydraulic testing machine accurate withinone-half of 1 percent. Displacements of one sheet withreopoct to the other were measured oa the edges of thesheets oTposite the center of the riveted joint by meansof two lE)-power microscopes with filar micrometers. Both :the displacement under load anfi the permanent displace-ment aftev removal of the load }Jere measured for succes-sively increasing loads until failure occurred.
The load-d18placement curves were plotted for allspecimens tested. (See figs. 2 to 6.) The shear loadeper rivet corresponding to permanent displacements of O.Old,0.02d, 0.03d, 0.04d, and 0.05d, where d is rivet diam-eter, were determined from these curves and are listed Intable I.
B’igure 7 chows a comparison of the load at variousvalues of permanent d.laplaoement for l/8-inch-diameterround-head and brazier-head rivets. The value of load ata given value of permanent dleplacement provldee a measureof the tightness of the joint. Eigure 7 therefore indicates
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that, for sheet thickndsees of 0.064 and 0.081 inoh$ theuse of l/8-lnoh bra~~er-head rivets produces a tighterjoint in shear than does the useJ of l/8-inoh round-headr.ivetso For & sheet thlcknesa of 0.025 ~tioh,--the round-head rivets are tighter than the brasier-head rivets.Yor she”et”thicknesses .of 0.032 and 0.040 inch, the twotypes of rivet are of about equal quality with regard toti~htness.- “No oomparatlve tests .were made with sheetthicknesses less than 0.025 inch or greater than 0..081inch, or with rivets of diameters other than 1/8 inch.
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Hardneds teste of representative samples of each ofthe two tyFes of ri-ret showed thht;they were ol’ about
“ equal hardness, and therefore that the other materialproperties for the two types were probably also about equs3~
Langley Lernorial Aeronautical Laboratory,National Advisory Committee for Aeronautics,
Langley Field, Va. “
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TABLEI g
ID’”EXPERIMENTALDATA FROMTESTSOF JOINTSRIVETEDWITHROUND-AND BRAZIER-HEADRIVETS
*Type of Rivet Sheet Load ver rivet Maximum
peclmen rivet diameter, Drill thickness, Ratio load TypeNumber head no. d/t Permanent Permanent
(1:. ) (i:. )Permanent Permanent Permanent per rivet of
displacement displacement displacement displacement displacement ( lb.) Fai lur(of O.Old Of 0.02d of 0.03d of @.04d of O.O’jd
;;:tRound 3/32 41 0.025 3*75 20G 215 220 225 20
1?246 a
~o 2 2.9t i
210 225
-z
21+o 245 25 250 a.0 0 2. 210
;;-2.20
.0 1z $
235 % k245 252
1$)-725 $;
h .?270 24
.0 4 230 25 255 260 --- 1 :Zf+
19-9 Round l/8 ~o .025 5.00 310 340 355t
65 7019-10 .0 2
i3.90 35
z370 395 00 ‘? iit :
19-11 .0 0 30 #19-12 .0 1
z;:$
370330
390Sk) 375 .y5 & :
19-1.?
.0 4 .z
330 360 375 418 a19-1
395.081
;;::2 ‘“md 5/32 21
1.5 300 335 350 ;$ 375 L04 a
.025 . 415;;~ q t
430 40 ---; 535 %
19-17 ;: o %; ?!I ??2 69~5 i19-19 %5 ?
75680 690 695
19-20 .081 1:93 580 6;? 655 670 675 i;? :
19-22 Round 3/16 11:%$ $:!! $ ~ $’70 5 G K :
675 67819-219-2z
:?.0 1
is-25 z725
“3Lo 8;; !
5%:
925.0 4 2. 3 740 :
19-27 !6~917
.102 1. 3 730 790 830 880 917 b
19-30 Brazier 1/819-31
30 .025 5.00 g 303?0
340 ~~‘? i
~oz
91 cb.0 2
19-32$
3.90 3984:2 4?
b.0 0
19-31+:.~
;%375
.?405 z
.0 4a
19-351
5?390 g & g
.08~ 1: &5 *a
350 370 400 a
a. Pure shear of rivets.
b. Shear of rivets and bearing of sheet.
o. Tensile failure of sheet adjacent to rivet.
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Figure l.- Test epecimen.
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rig. 2
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300
100
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t–l’-+-+ ~-:;::t-:y~-pl–-f-”p’-l---l1. -.
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:1 I ---- Disylacament.— -i-
f Under load# ~ -— ~—” 1L9xKnzl_lof)..d
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●004 .ooe .012 0 .004 .008 .012 .016Displacement, in.
Figure 2.- ?.oad-displacementcurves. Roun&heai rivets 3/3>lnch in.diameter.
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rig. 3
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0’ ● 004 . 9Q8 .0120 #004 , W18
Displacomcnt, in.
— Pormamat M splacmdnt-— ----- -- Dieplacemnt unihr load—— — tilmum loa.i
Ylg&e 3.- L-d=displacomcnt ourvem. .30und=hw3 rlvots 1/8 inch hdiamter. .
.-. —. —--- .- -- -.-— .————.. ---—— .—— — .—
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7
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&’jo “, , ;, -’l=, -,” , ,,-,I I I I ! ! t
.--t-l-?-t: ‘,”0?5:n”t+F-H-++!=! - ‘- -T5001- 1
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0 1
800 —t
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200 -’/
1
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0
11’iguro4.-
.004 .008 .012 .016 0 .004 .008 .012 .016Displacw’rwnt,in,
Loa&displacerflcntcurves. Roand-head riv~ts 5/32 inch indiameter.
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J?ig. 5
8000,r-lU’1‘t1.4
400
0
\r
g 800l-l
400
I I I / I .04017
t = 0.032 in. j — —.
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w:
1’/’ —.-i
Iii I——.051+-+-—-+- .064 !. -
*
_ q- “ ‘e _–-j,z“ -4 \ I -i- –7=–3-==+’-
.,/ i / / M?lill
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1 I ~
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_.u_L_++-—- P&rman&.lt
o’
I?igure 5.-
y--j--j++1+y+---y+.008 ● O(M o .008 .016
Displacema;t, in.
Load-cii splacernent curves. Round-heacl rivets 3/16-inch in.diameter.
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400
200
0
~ 200m
400
200
Z’igurc6.-
Fig. 6
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under load- —-Maximum load —.——
0 .004 .008 .:012()● 004 .008 .*O12
Displacom.?nt, in.
Load-displacement curves. Brazier-hcaci rivets l/8-inch indiameter.
● 02 .04 .06 .08 .02 .04 .06 ,08
Figure 7.- Compariscr.of load at various values of permanent dis@kceziemtfor l/8-inch diaw~ter round-head 5.nd brazier-head iivets.