Introduction to Aircraft Structural Analysis (Elsevier Aerospace Engineering)

11.4 Connections 365

Plate Failure in Tension

Theareaofplateintensionalongthelineofrivetsisreducedduetothepresenceofrivetholes.Therefore,
iftheultimatetensilestressintheplateisσult,failurewilloccurwhen

Pb

t(b−d)

=σult

fromwhich

P=

σultt(b−d)

b

(11.3)

Shear Failure in a Plate

Shearingoftheplatesmayoccurontheplanesccresultingintherivetsbeingdraggedoutoftheplate.
Ifthemaximumshearstressatfailureofthematerialoftheplatesisτ 2 ,thenafailureofthistypewill
occurwhen

Pb= 2 atτ 2

whichgives

P=

2 atτ 2

b

(11.4)

Example 11.1
Ajointinafuselageskinisconstructedbyrivetingtheabuttingskinsbetweentwostrapsasshownin
Fig.11.12.Thefuselageskinsare2.5mmthickandthestrapsareeach1.2mmthick;therivetshavea
diameterof4mm.Ifthetensilestressinthefuselageskinmustnotexceed125N/mm^2 andtheshear
stressintherivetsislimitedto120N/mm^2 ,determinethemaximumallowablerivetspacingsuchthat
thejointisequallystronginshearandtension.

Fig.11.12

Joint of Example 11.1.