Introduction to Aircraft Structural Analysis (Elsevier Aerospace Engineering)

364 CHAPTER 11 Structural Components of Aircraft

Fig.11.11

Simple riveted lap joint.

Suppose that the plates carry edge loads ofP/unit width that the rivets are of diameterdand are
spacedatadistancebapartandthatthedistancefromthelineofrivetstotheedgeofeachplateisa.
Therearefourpossiblemodesoffailurewhichmustbeconsideredasfollows.

Rivet Shear

Therivetsmayfailbyshearacrosstheirdiameterattheinterfaceoftheplates.Then,ifthemaximum
shearstresstherivetswillwithstandisτ 1 ,failurewilloccurwhen

Pb=τ 1

(

πd^2

4

)

whichgives

P=

πd^2 τ 1

4 b

(11.1)

Bearing Pressure

Eithertherivetorplatemayfailduetobearingpressure.Supposethatpbisthispressurethenfailure
willoccurwhen

Pb

td

=pb

sothat

P=

pbtd

b

(11.2)