Machine Design
Failure of a material is called fatigue when it fails

At the yield point
Below the yield point
Below the elastic limit
At the elastic limit

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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

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

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