WAlwwm luwolr’r - ntrs.nasa.gov · NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS WAlwwm luwolr’r ORIGINALLY ISSUED June 1943 as RestrictedBulletin 3F21 TESTDATA ON THE SHEAR STRENGTHOF

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

,.

\

,,

!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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