Interference fit — pressure, force, torque and assembly temperature
Contact pressure, friction force/torque and stresses for an interference fit (Lame equations), plus the cooling/heating temperature needed for expansion/shrink-fit assembly.
Interference pressure, p6.53667127205144 MPa
Friction force, F1.4169535328573695 kN
Transmission torque, T16.29496562785975 Nm
Stresses
σt inner ring @ dᵢ-53.61083880488703 MPa
σt inner ring @ d-47.074167532835595 MPa
σt outer ring @ d7.714630428214006 MPa
σt outer ring @ dₒ1.1779591561625655 MPa
σe inner ring @ dᵢ53.61083880488703 MPa
σe inner ring @ d44.17009125710193 MPa
σe outer ring @ d12.356034843645773 MPa
σe outer ring @ dₒ1.1779591561625655 MPa
Assembly temperature
Cooling temperature (inner part), dTᵢ-75.00000000000001 K
Heating temperature (outer part), dTₒ125 K
Unlike the sibling press-fit calculator (e3_8), this page takes the diametral interference ratio δ/d directly as an input rather than deriving it from δ and d, and adds an independent assembly-temperature calculation for cooling the inner part / heating the outer part to reach a target mounting interference.
Method & references
- Lame’s equations for thick-walled cylinders (elastic regime).
- Default values represent a polymer bushing, steel hub.
The computation is a literal port of the original client-side JavaScript from /calculators/e6_2.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.