Machine Design
The connecting rod bolts are tightened up so that tightening stress

Is 50% of yield point
Is just sufficient to hold parts together
Approaches yield point
Is about yield point divided by safety factor

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Machine Design
The creep in the belt is due to

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

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