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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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Obtain variable moment of inertia (I) in each leaf
Make M/I constant throughout the length of the leaf
Permit each leaf to act as an overhanging beam
Have variable bending moment (M) in each leaf

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