Step 
Parameter/Condition 
Symbol 
Equation 
Dimensional Parameters 
1 
Differential radial interference due to Poisson’s effect of axial force 
u_{poisson} 

2 
Differential thermal radial interference due to different operation and assembly temperatures for different materials 
u_{thermal} 

3 
Hub radial displacement due to rotation 
u_{h,cfg} 

4 
Shaft radial displacement due to rotation 
u_{s,cfg} 

5 
Maximum diametrical interference 
∆ 

Pressure Parameter 
6 
Interference pressure as a result of diametrical interference 
P 

Pressure & Stress Parameters (Hub) 
7 
Radial stress on hub due to interference pressure 
σ_{r,pressure} 

8 
Circumferential stress on hub due to interference pressure 
σ_{θ,pressure} 

9 
Axial stress on hub due to axial force 
σ_{z} 

10 
Shear stress on hub caused by torque 
τ 

11 
Circumferential stress on hub due to centrifugal effect 
σ_{θ,cfg} 

12 
Von Mises stress at the hub surface 
σ_{VM} 

Pressure & Stress Parameters (Shaft) 
13 
Radial stress on shaft due to interference pressure 
σ_{r,pressure} 

14 
Circumferential stress on shaft due to interference pressure 
σ_{θ,pressure} 

15 
Axial stress on shaft due to axial force 
σ_{z} 

16 
Shear stress on shaft caused by torque 
τ 

17 
Circumferential stress on shaft due to centrifugal effect 
σ_{θ,cfg} 

18 
Von Mises stress at the shaft surface 
σ_{VM} 
