Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

70 to 83%
63 to 70%
45 to 60%
80 to 90%

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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
Effect of temperature on belt
Material of belt

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