Machine Design
The connecting rod bolts are tightened up with initial tension greater than the external load so that

Bolts will not loosen during service
The resultant load on the bolt would not be affected by the external cyclic load
Bolts are weakest elements
Joint may not open up

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Machine Design
The creep in the belt is due to

Material of belt
Effect of temperature on belt
Stresses beyond elastic limit of belt material
Unequal extensions in the belt due to tight and slack side tensions

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