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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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3 117601 ~9761

EATIOIT&T ADVISORY COMMITTEE 10R AERO19AUTICS

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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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. . . . . . . . . .2

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.

.

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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1

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I.)

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+-L15” 15—32 i 3—2

— La” _16

——T

3/4”

(

(\

—

.,

— .t

1

1

*— t

Figure l.- Test epecimen.

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rig. 2

3oo~ I I I Y

in. .032

--1- i“ =1-

----0

200 7M 0.’‘– tf

f~! — —

100 ;- +_ -.+ ‘

I

1- 1I —

0~l! I

1 i 1. 1!

300

100

0

t–l’-+-+ ~-:;::t-:y~-pl–-f-”p’-l---l1. -.

L1-‘“‘“4’-:—----I—-

;~~-l;p-‘j ‘i-~e~l.t-L-i --+ (ii Splikem’lt -—

:1 I ---- Disylacament.— -i-

f Under load# ~ -— ~—” 1L9xKnzl_lof)..d

..

●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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iucA

. . . .

rig. 3

. ..- ,.4. ,, -,4 .- w.-,. . .

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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lfACA Fig. 4

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\

,,

!3

7

..@2v-i$.4

&’jo “, , ;, -’l=, -,” , ,,-,I I I I ! ! t

.--t-l-?-t: ‘,”0?5:n”t+F-H-++!=! - ‘- -T5001- 1

/

0 1

800 —t

..-

200 -’/

1

I

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 — —.

w’ “ -: ‘-

——

T-..- .— /“ ‘“--*-/, —+- ‘- ‘[ f“//

i ‘. . -—-—I/

w:

1’/’ —.-i

Iii I——.051+-+-—-+- .064 !. -

*

_ q- “ ‘e _–-j,z“ -4 \ I -i- –7=–3-==+’-

.,/ i / / M?lill

—., — !-----=~l..=--l--l

+--j--- -–-++-*-+’+ ~

1 I ~

-4..—_._—

-i-- ,i’ I

;, t

i-.-1-.--1-{/ , }-~–1--- i

i–+.-t-+ -:-- --–-.-..—+———_______ i--I 8 I

I

i ,/j]-.“ ‘—-’.102 , “1M---‘-- ‘—”l–-”--l”— ‘--– ‘– 1

k

---- .—

:>; *- ~---- =. I..r--. +‘1’I - ‘*II

_.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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I

L

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.

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