Interference Fit Analysis in Mechanical Systems
Summary
Interference fits form a fundamental method of joining cylindrical components by exploiting a controlled dimensional overlap. By engineering a slight oversize on the shaft relative to the hub bore, contact pressures develop that transmit torque, constrain motion and ensure structural integrity without the need for fasteners or welds. Analyses of interference fits address the elastic and plastic stress distributions around the junction, the effects of thermal assembly methods such as shrink- or heat-fitting, and the evolution of residual stresses over the service life. Advances in analytical modelling have enabled rapid preliminary design of multi-layer assemblies, while high-fidelity finite element simulations capture nonlinear contact behaviour, stress concentration and fretting phenomena. Complementary experimental techniques, including acoustic wave propagation, provide non-destructive estimation of in situ stress states. Together, these tools underpin the global deployment of interference fit connections in sectors from aerospace spigots to railway wheelsets, offering compact, high-rigidity solutions with predictable fatigue performance and ease of disassembly for maintenance.
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Researchers have applied acoustoelastic theory combined with finite element modelling to ultrasonic wave propagation in shrink-fit assemblies. By correlating stress-dependent velocity shifts of elastic waves with analytical thick-walled cylinder solutions, they demonstrated a non-destructive route to map interference-induced stress distributions, offering a tool for service-life prediction and maintenance scheduling.
Investigation of surface treatments has revealed that nickel plating on medium-carbon steel shafts assembled into copper-zinc alloy hubs increases extraction forces by around 20 per cent. Microscopic analysis confirmed reduced adhesion and enhanced reusability of plated components, indicating an economically advantageous route to augment load capacity and extend component life in mixed-material interference fits.
Foundational analytical work on multi-layer thick-walled cylinders has delivered closed-form solutions for contact pressure and stress in assemblies subject to thermal loading. Validated against nonlinear finite element results, these formulae enable rapid estimation of interference values for engine crankshaft bearings and similar applications, reducing computational cost and guiding early-stage parameter studies.
Interference Fit Analysis in Mechanical Systems publication trend
The graph below shows the total number of articles in interference fit analysis in mechanical systems across all publications each year (not limited to Nature Index journals).
Technical terms
Interference fit: A joint formed by inserting a slightly oversized shaft into a slightly undersized hub, generating contact pressure to transmit loads.
Contact pressure: The radial pressure at the interface of two assembled components arising from elastic or plastic deformation.
Finite element analysis: A numerical method subdividing a structure into elements to solve complex stress, strain and contact problems.
Acoustoelastic theory: A principle describing how stress alters the propagation velocity of elastic waves, enabling non-destructive stress measurement.
References
- Analytical Solution for Interference Fit for Multi-Layer Thick-Walled Cylinders and the Application in Crankshaft Bearing Design. Applied Sciences (2016).
- Effects of Nickel Plating on Interference Fit between Medium Carbon Steel and Copper–Zinc Alloy Parts. Metals (2023).
- Ultrasonic wave simulation in shrink-fit assembly for the estimation of stress at the contact interference. Advances in Mechanical Engineering (2024).
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