Machine Design
Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

Completely reversed loading
Static loading
Dynamic loading
Combined static and dynamic loading

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

New and old belts will cause vibrations
Belts are available in sets
Only one belt cannot be fitted with other used belts
The new belt will carry more than its share and result in short life

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