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Geometry Factor:

Where:

  E_p  = Modulus of elasticity of considered plastic hub or boss

  v_p   = Poissons ratio of plastic

= Allowable design stress for plastic

  i    = d_s - d_i = Diametral interference

  i_a  = 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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