Machine Design
When the bolt is very yielding as compared to the connected members, then the resultant load on the bolt will be equal to the

External load applied
Initial tension or external load, whichever is greater
Initial tension
Sum of the initial tension and external load applied

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Machine Design
The creep in the belt is due to

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

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