The analysis of shrink-fit connection – the methods of heating and the factors influencing the distribution of residual stresses

Król, Roman; Siemiątkowski, Zbigniew

doi:10.1016/j.heliyon.2019.e02839

Cited by 9 publications

(3 citation statements)

References 10 publications

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“…Utilization of the symmetry boundary conditions makes it possible to obtain more accurate analysis because of the higher number of finite elements in the half-model mesh. 21 As illustrated in Figure 5(a) , the grid density decreases from the outmost surface to the center, and finer mesh can be seen around the crankweb hole. For electromagnetic field analysis, the induction coil, crankthrow and air can be meshed with SOLID117 element.…”

Section: Finite Element Modelmentioning

confidence: 95%

Simulation study on modified coil configuration used for shrink fitting of semi-built-up crankshaft and parameters influencing the thermal distribution

Duan

Zhang

Long³

et al. 2020

Science Progress

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Semi-built-up crankshafts are universally manufactured by shrink-fitting process with induction heating device. The configurations of induction coil have a great impact on the distributions of eddy current and temperature of crankthrows. Most induction devices are apt to cause some undesirable phenomena such as uneven temperature distribution and irregular deformation after induction heating. This article proposes a modified configuration of induction heating coil according to the crankthrow geometry. By combining the heat conduction equation and the heat boundary conditions, a three-dimensional finite element model, which takes into account the nonlinearity of the material’s electromagnetic and thermal physical properties in the heating process, was developed. The influence of several parameters, such as position and curvature of the arc coil, the current frequency and density, coaxiality of crankweb hole and coil, influencing the temperature distribution inside the crankthrow was also analyzed. The comparison with the numerical simulation results of the original configuration indicates that the modified configuration has better adaptability to the crankthrow. Also, it can help to improve the temperature distribution, and reduce the deformation of the shrink-fitting hole. This exploration provide an effective way for the enterprise to further enhance the shrink-fitting quality of crankshaft.

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Section: Finite Element Modelmentioning

confidence: 95%

Simulation study on modified coil configuration used for shrink fitting of semi-built-up crankshaft and parameters influencing the thermal distribution

Duan

Zhang

Long³

et al. 2020

Science Progress

View full text Add to dashboard Cite

show abstract

“…The study did not analyze the shaft restraint in the bearings. In some studies, only a fragment of the shaft was analyzed [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

An Analysis of Reaction Forces in Crankshaft Support Systems

et al. 2022

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During measurements, the crankshafts of marine engines are usually supported on a set of rigid prisms. Such prisms maintain a constant height position, cause different values of reaction forces and, consequently, may cause elastic deformations of the crankshafts. Thus, the measurements of the dimensions and geometry of the crankshaft may be distorted. This article proposes a measuring system developed to support the crankshaft with a set of flexible supports. These supports implemented the given reaction forces, which ensured the elimination of the crankshaft deformations, regardless of the possible deviations, i.e., in the coaxiality of the main crankshaft journals. The values of these forces were calculated using the finite element method (FEM). These calculations showed that in order to eliminate the crankshaft deformations, the values of the reaction forces must change not only on individual supports, but also with the change of the shaft rotation angle during the measurement. The numerical experiments showed that the application of flexible supports results in uniform contact reaction forces on adjacent main journal supports. This uniformity occurs regardless of the quality of the crankshaft geometry. Thus, the necessity to use a set of flexible supports for measuring marine engine crankshafts was confirmed. The research also showed that the values of the reaction forces ensuring the elimination of shaft deflections under the assumption of nodal support can be treated as corresponding to the resultant reaction forces realized by the prismatic heads.

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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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The analysis of shrink-fit connection – the methods of heating and the factors influencing the distribution of residual stresses

Cited by 9 publications

References 10 publications

Simulation study on modified coil configuration used for shrink fitting of semi-built-up crankshaft and parameters influencing the thermal distribution

Simulation study on modified coil configuration used for shrink fitting of semi-built-up crankshaft and parameters influencing the thermal distribution

An Analysis of Reaction Forces in Crankshaft Support Systems

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

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