Simplified contact-pressure screen
Interference / press fit
Inputs
Actual or nominal external diameter at the press-fit interface.
Actual or nominal interface bore; it must be smaller than the shaft for this press-fit screen.
Outer hub diameter in the reference geometry factor; it must exceed the bore.
Uniform cylindrical interface engagement length.
Single user-entered modulus used by the simplified reference relation; no shaft/hub compliance split is modeled.
User-entered interface coefficient from 0 through 1; this workspace does not select it.
Results
Diametral interference
0.025
Reference hub geometry factor
0.6
—Reference contact pressure
60
Friction holding / assembly-force estimate
70.686
Friction holding-torque estimate
1,767.1
δ = Ds−Di; p = (δ/Di)E[(Do²−Di²)/(Do²+Di²)]; Fμ = πDiLpμ; Tμ = FμDi/2
A first-pass number, not a code check, certification, or approval. Read the method and its limits below. What this is and is not.
Nearby: Axial response · Beam deflection & reactions · Elastic stability · Solid-shaft torsion
Method
Formula, when it applies, and when it does not
Estimate interference, reference contact pressure, friction holding force, and holding torque for a user-defined shaft-to-hub press fit.
δ = Ds−Di; p = (δ/Di)E[(Do²−Di²)/(Do²+Di²)]; Fμ = πDiLpμ; Tμ = FμDi/2
When
- Single elastic hub factor
- Uniform interface pressure
- User-entered friction
- No yield assessment
Don’t
- This follows a simplified single-modulus, Lame-style hub geometry-factor relation with uniform interface pressure and user-entered friction. It does not split shaft and hub compliance, select a tolerance, assess yield or fit class, model temperature/assembly method/surface texture, include centrifugal unloading or dynamic/fatigue behavior, rate equipment, or approve a joint.
Shigley's Mechanical Engineering Design — interference fits, Lamé thick-wall relations