Machine Design
In cyclic loading, stress concentration is more serious in

Brittle as well as ductile materials
Elastic materials
Ductile materials
Brittle materials

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Machine Design
In oilness bearings

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

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