Machine Design
For unequal width of butt straps, the thicknesses of butt straps are

0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
0.75 t for both the straps on the inside and outside
0.625 t for both the straps on the inside and outside

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Machine Design
The creep in the belt is due to

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

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