Distribution of conformal contact pressure in spherical plain bearings considering friction and free-edge effects

Li, Yuan; Han, Baoming; Yao, Xuefeng; Jiang, Liting; Liu, Jie

doi:10.1177/1350650120975519

Cited by 4 publications

(4 citation statements)

References 30 publications

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“…When the capsizing moment is less than the critical moment, the contact interface is in complete contact, and the undetermined coefficients a 0 and a 1 are calculated through equations ( 9) and ( 10); when the capsizing moment is greater than the critical moment, the contact interface is in receding contact, and the contact length is determined by equation (15) or FE model, and then the undetermined coefficients are calculated by equation ( 16).…”

Section: Numerical Implementation Flow Of the Analytic Modelmentioning

confidence: 99%

“…Receding contact occurs on the Int-1 and Int-6 whose contact length decreases apparently as compared to the complete contact due to the capsizing moment and bending deformation, and another significant feature is that the contact pressure is vanishing at the corner points of the cone root, while the concentrated stress near the cone tip increases obviously. However, since the increase of axial load will increase the concentrated force and capsizing moment together, the contact length will not change significantly with the axial load, as shown in equation (15).…”

Section: Influence Of Axial Loadmentioning

confidence: 99%

“…Belhocine and Abdullah 14 used the FE analysis to study the contact phenomenon between the brake disk and pads. Yuan et al 15 studied the conformal contact pressure distribution of spherical plain bearing by adopting FE simulations. For the experimental method, Dreher et al 16 investigated the interfacial pressure distribution and contact area internal to a lap joint through the use of an electronic pressure film.…”

Section: Introductionmentioning

confidence: 99%

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Contact pressure distribution of Multi-cone friction pair considering capsizing moment and stress singularity at the interface end

Wang

Dou

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Contact characteristics of friction pair play a crucial role in the torque transmission capacity and temperature rise prediction of automotive clutches. In this study, a Multi-cone friction pair used in wet clutches has been proposed. Each pair of conical contact is considered as the contact between a finite stiffness punch and an elastic half-plane, and 2D finite element (FE) models are developed to calculate the contact load assignments. Considering the capsizing moment and stress singularity at the end of the contact interface, an analytic model is established to obtain the contact pressure distribution on each conical contact interface based on the results of contact load assignments. Finally, the numerical examples are given, and the influences of axial load, mating material characteristics, friction coefficient, and cone angle on contact pressure distribution have been discussed in detail, which supplies the guidance of parameters design for Multi-cone friction pair.

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Section: Numerical Implementation Flow Of the Analytic Modelmentioning

confidence: 99%

Section: Influence Of Axial Loadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Contact pressure distribution of Multi-cone friction pair considering capsizing moment and stress singularity at the interface end

Wang

Dou

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…A new universal approximate model for frictionless conformal and nonconformal spherical contacts, obtained by combining analytical and numerical methods, is proposed in [7] and adopted in [8], focusing on the free-edge effect in spherical plain bearings, and in [9] to investigate the effects of external load, radius clearance values, and material parameter on the contact mechanics of spherical fixed ring roller cone drill bits journal bearings. The effects of normal loads and friction coefficients on the distribution of both axial and circumferential contact stress in spherical plain bearings are studied, adopting both theoretical methods and FE simulations, in [10]. A generic contact mechanics analytical approach for the determination of sub-surface stresses, which is applicable to both highly conforming as well as concentrated counter-forming contacts, is presented in [11].…”

Section: Introductionmentioning

confidence: 99%

Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness

et al. 2022

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Tilting pad journal bearings (TPJB) are used in turbomachinery for their stability at high speeds. For design purposes, it is necessary to preliminarily investigate the turbomachine rotor dynamic behavior by simulation. The dynamic characteristics of all components must be known as precisely as possible and experimental validation of each single model is required. While a lot of work has been carried out on bearings, the ball-and-socket stiffness is still estimated by means of Hertzian formulas. Recently, some authors have used the finite element method, but it seems that nothing has been done experimentally to date. This paper describes the test rig designed to determine the stiffness of a TPJB ball-and-socket pivot by equipping the grippers of a tensile universal testing machine with specifically designed interfaces. A methodology for evaluating the stiffness from the experimental results is reported. Preliminary compression results are presented and compared with the analytical ones obtained using Hertz’s formula showing significant differences for the ball-and-socket conformal contact.

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Dynamic analysis and wear calculation of space deployable mechanism considering spherical joints with clearance and coating

Jing

Liu

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the space deployable mechanism considering spherical joints with clearance, the kinematic stability and working life of will be seriously affected. To address this problem, this paper proposes a nonlinear stiffness coefficient expression and an improved viscous damping coefficient expression considering the wear reduction properties of coatings, so as to obtain a conformal contact force model based on the analysis and comparison of the existing common normal contact force models. The new contact force model is qualitatively analyzed from three aspects, namely clearance size, recovery coefficient, and material properties, so as to demonstrate the correctness and applicability of the model. In the prefabricated space deployable mechanism (RSSP) with spherical joint clearance, the acceleration variation of the actuator is analyzed and compared by using the new contact force model, and the wear quantity of the spherical joints with clearance and coating is predicted. The dynamic results show that spherical joints with clearance have a significant effect on the acceleration of the actuator, and the long working time will inevitably lead to increased vibration and reduce the motion accuracy and life of the mechanism. By comparing with the calculation results of wear, it is found that the wear of spherical joint clearance with coating decreases significantly in all vector directions, and the wear area of the Euler Angle increases slightly compared with that without coating because of the increase of contact collision frequency. Therefore, the wear calculation method and coating strategy proposed in our work can provide a theoretical basis for improving the kinematic accuracy and working life of space deployable mechanism system considering spherical joints with clearance.

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Distribution of conformal contact pressure in spherical plain bearings considering friction and free-edge effects

Cited by 4 publications

References 30 publications

Contact pressure distribution of Multi-cone friction pair considering capsizing moment and stress singularity at the interface end

Contact pressure distribution of Multi-cone friction pair considering capsizing moment and stress singularity at the interface end

Tilting Pad Journal Bearing Ball and Socket Pivots: Experimental Determination of Stiffness

Dynamic analysis and wear calculation of space deployable mechanism considering spherical joints with clearance and coating

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