Effects of homogeneous and inhomogeneous heating on rotating shrink fits with annular inclusion and functionally graded hub

Apatay, Tunç; Arslan, Eray; Mack, Werner

doi:10.1080/01495739.2019.1638856

Cited by 6 publications

(4 citation statements)

References 46 publications

(70 reference statements)

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“…In order to reduce the difficulty of disassembly, the means of thermal expansion [15][16][17], cold contraction [18] or the injection of high-pressure oil into the fitting surface [19] are often used in engineering practice to realize the separation of fitting parts. The key point of these methods is to reduce the contact pressure of fitting surface to separate the parts easily.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Reduction Effect of Pit Texture on Disassembly Damage for Interference Fit

Zhou

Gao

et al. 2023

Chin. J. Mech. Eng.

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After remanufacturing disassembly, several kinds of friction damages can be found on the mating surface of interference fit. These damages should be repaired and the cost is closely related to the severity of damages. Inspired by the excellent performance of surface texture in wear reduction, 5 shapes of pit array textures are added to the specimens’ surface to study their reduction effect of disassembly damage for interference fit. The results of disassembly experiments show that the order of influence of texture parameters on disassembly damage is as follows: equivalent circle diameter of single texture, texture shape and texture surface density. The influence of equivalent circle diameter of single texture and texture shape are obviously more significant than that of texture surface density. The circular texture with a surface density of 30% and a diameter of 100 μm shows an excellent disassembly damage reduction effect because of its perfect ability of abrasive particle collection. And the probability of disassembly damage formation and evolution is also relatively small on this kind of textured surface. Besides, the load-carrying capacity of interference fit with the excellent texture is confirmed by load-carrying capacity experiments. The results show that the load-carrying capacity of the excellent texture surface is increased about 40% compared with that of without texture. This research provides a potential approach to reduce disassembly damage for interference fit.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Reduction Effect of Pit Texture on Disassembly Damage for Interference Fit

Zhou

Gao

et al. 2023

Chin. J. Mech. Eng.

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“…This way, the assembly process causes a non-uniform contact pressure at the interface shaft-hub that is quite different to the uniform contact pressure given via the theory of pressure cylinder used for designing the press fits. There are different methods used for reducing such stress concentrations that consists of modifying the geometry of the hub [24][25][26][27][28][29]: the use of round grooved hubs [24,25], the chamfer hubs [26,27], or the use of contact pressure rings [28]. More complex hub geometries are considered in [16] where a hub with an exponential variated thickness in the radial direction was considered.…”

Section: Introductionmentioning

confidence: 99%

“…More complex hub geometries are considered in [16] where a hub with an exponential variated thickness in the radial direction was considered. Furthermore, other studies are focused on the analysis of hubs with a variable radial interference [27] or functionally graded materials [14,29]. The experimental determination of contact pressure at the hub-shaft interface exhibits serious difficulties.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Friction Coefficient on the Stress Distributions and Contact Pressure in Press-Fits via Finite Element Analysis

Izard,

Garcia-Martín,

Rodríguez-Martín

et al. 2023

Lubricants

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Press fits are a simple and effective method for assembling a shaft into a hub for different applications in the mechanical engineering field. This method consists of forcing to pass a shaft into a hub via axial insertion. As a result of the difference in the diameters of both components of the shaft and hub, a radial interference is generated, causing a contact pressure at the interface shaft–hub. Contact pressure and the friction coefficient are key factors influencing the maximum transmitted torque. So, in this study, different scenarios for the assembly of a press fit were simulated using finite elements (FE) in order to reveal the influence of this key parameter on the manufacturing-induced stresses in the hub. This way, different friction conditions were considered in terms of the friction coefficient from the frictionless case to a case of high dry friction. In addition, different hub geometries were analyzed including conventional hubs and chamfer hubs with optimal geometry that allows lowering the localized stress concentrations at the hub edges. This way, a more realistic estimation of the final stress state of a press fit is obtained. According to the obtained results, the friction coefficient is revealed as a key parameter in the resulting stress field, causing a non-uniform distribution of stress that can affect the mechanical performance of the press-fit assembly.

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“…The aim is to transmit torque between the shaft and the hub, a generic name used for representing diverse mechanical components such as gears, bearings, pulleys, etc. An interference fit can be assembled by two different methods: (i) axial, by inserting the shaft into the hub applying an axial force (press fit) [1,2], or radial, by a thermal cycle either heating the hub or cooling the shaft (shrink fit) [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of the Reduction in Stress Concentration Factors in Shrink Fits by Using Contact Rings

et al. 2022

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As it is well known, shrink fits exhibit a stress concentration at the hub edges that can cause the failure of such mechanical components. A method for reducing such a stress concentration is placing a contact ring between the hub and the shaft. To achieve the desired effect, the Young Modulus of the material used for the contact ring must be lower than the one used in the hub and the shaft. Unfortunately, there are no design methods for estimating the optimal dimensions or materials of the contact ring. To fill this gap, in this study, diverse numerical simulations by the finite elements method (FEM) were carried out considering different geometries and materials in order to obtain recommendations that allow mechanical designers to significantly reduce the stress concentrations in these components. According to the obtained results, a contact ring of 25% of the hub thickness allows to significantly reduce up to 40% of the stress concentration. In addition, a linear influence of the stress reduction with the Young modulus was found thereby, and the most recommendable material for the contact ring is the one with the lowest Young modulus. On the other hand, according to the obtained results, the influence of the Poisson coefficient can be considered negligible.

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Effects of homogeneous and inhomogeneous heating on rotating shrink fits with annular inclusion and functionally graded hub

Cited by 6 publications

References 46 publications

Experimental Study on the Reduction Effect of Pit Texture on Disassembly Damage for Interference Fit

Experimental Study on the Reduction Effect of Pit Texture on Disassembly Damage for Interference Fit

Influence of the Friction Coefficient on the Stress Distributions and Contact Pressure in Press-Fits via Finite Element Analysis

Finite Element Analysis of the Reduction in Stress Concentration Factors in Shrink Fits by Using Contact Rings

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