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Plastics Design Resources
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Geometry Factor:
Where:
Ep =
Modulus of elasticity of considered plastic hub or boss
vp =
Poissons ratio of plastic
 = Allowable design stress for plastic
i = ds
- di = Diametral interference
ia =
Allowable interference
Case #1
Shaft and Hub have identicleor very simular materials.
Hoop stress given i is:
and the interference is:
Case #2
Shaft is metal and hub is plastic, Hoop stress is
given i is:
and the interference is:
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