Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

p.d.σt
(p - d) t.σt
p.t.σt

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Machine Design
In oilness bearings

Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
Grease required to be applied after some intervals
The oil film pressure is generated only by the rotation of the journal

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