Uneven extensions and contractions of belt due to varying tension
In Belt drives when the belt passes from the slack side to the tight side a certain portion of the belt extends. Similarly when the belt passes from the tight side to slack side it contracts. Hence creep in belt drive is due to uneven extensions and contractions of the belt when it passes from tight side to slack side.
This phenomenon of alternative stretching and contraction of the belt results in relative motion between the belt and the pulley surface. This relative motion is called creep.
Stress
If a force acts on a body, it sets up some resistance to the deformation. This resistance is known as Stress.
directly proportional to
Whenever a material is loaded within elastic limit, stress is directly proportional to strain.
0.25 to 0.33
Poisson's ratio is defined as the ratio of Lateral strain and longitudinal strain.
