Contact mechanics

Briscoe, B.J.

doi:10.1016/0301-679x(86)90085-x

Cited by 27 publications

(12 citation statements)

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“…Note that the traditional Hertz contact theory is no longer applicable to subsurface stress analysis. Johnson [19] calculated the principal stress at any depth under contact surface theoretically, and then used the Mohr circle to calculate shear stress. The subsurface shear stress reaches its maximum and minimum values at a certain depth, and changes alternately along the direction paralleling to bearing raceway.…”

Section: Subsurface Shear Stressmentioning

confidence: 99%

A new explanation of Rolling Contact Fatigue in bearing steels based on multiscale models

Sun

Cao

2022

J. Phys.: Conf. Ser.

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Rolling Contact Fatigue (RCF) is harmful and inevitable to bearings and usually results in the initiation of subsurface damage. The root cause for this damage is the cumulative plastic deformation accentuated by carbides. This paper gives a new explanation of RCF based on multiscale models. The distribution and change law of subsurface shear stress in bearing steels was previously investigated by a finite element model. A two-phase atomic model of bcc-Fe and cementite was built. Ten alternating shear load cycles were designed to explore the mechanisms of the cyclic plastic accumulation when the atomic model was initially in the elastic, elastic- plastic and plastic stages, respectively. The results show that cyclic softening diversely occurs in all three types of stress responses. Severe cyclic shear deformation eventually leads to earlier cyclic softening and stress yield, which might be the micromechanism of plastic accumulation and RCF in bearing steels.

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Section: Subsurface Shear Stressmentioning

confidence: 99%

A new explanation of Rolling Contact Fatigue in bearing steels based on multiscale models

Sun

Cao

2022

J. Phys.: Conf. Ser.

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“…When applying boundary element method to solve the LSD of mating surfaces represented by Non-Gaussian skin model shapes, it is necessary to replace the contact between two nonideal surfaces by the contact between ideal rigid surface and equivalent nonideal nonrigid surface and then discretize the equivalent nonideal nonrigid surface. Furthermore, the relationship between contact pressure and LSD at discrete points is established based on Green's function and Boussinesq theory (Briscoe, 1985). For the rectangular contact surface, assuming that the number of sampling points in the x - and y - directions is M and N , respectively, which is consistent with the number of sampling points of Non-Gaussian skin model shapes, then the LSD at the sampling points ( i , j ) (represented as u i,j ) under contact pressure distribution p is given in equation (13): where p k,l is the contact pressure at the sampling point ( k , l ), D i−k,j−l is the deformation influence coefficient between the sampling point ( i , j ) and ( k , l ).…”

Section: Analysis and Calculation Of Local Surface Deformation Of Mat...mentioning

confidence: 99%

Tolerance analysis of planar parts with skin modeling considering spatial distribution characteristics of surface morphology and local surface deformations

Shen

Lu²

2022

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Purpose This paper aims to develop a method to improve the accuracy of tolerance analysis considering the spatial distribution characteristics of part surface morphology (SDCPSM) and local surface deformations (LSD) of planar mating surfaces during the assembly process. Design/methodology/approach First, this paper proposes a skin modeling method considering SDCPSM based on Non-Gaussian random field. Second, based on the skin model shapes, an improved boundary element method is adopted to solve LSD of nonideal planar mating surfaces, and the progressive contact method is adopted to obtain relative positioning deviation of mating surfaces. Finally, the case study is given to verify the proposed approach. Findings Through the case study, the results show that different SDCPSM have different influences on tolerance analysis, and LSD have nonnegligible and different influence on tolerance analysis considering different SDCPSM. In addition, the LSD have a greater influence on translational deviation along the z-axis than rotational deviation around the x- and y-axes. Originality/value The surface morphology with different spatial distribution characteristics leads to different contact behavior of planar mating surfaces, especially when considering the LSD of mating surfaces during the assembly process, which will have further influence on tolerance analysis. To address the above problem, this paper proposes a tolerance analysis method with skin modeling considering SDCPSM and LSD of mating surfaces, which can help to improve the accuracy of tolerance analysis.

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“…Before the experiment, the samples were cleaned with alcohol. Dry sliding wear tests were carried out under reciprocating sliding conditions at 50 • C and 125 • C. The contact load was 15 N corresponding to the initial Hertzian contact pressure [32] of 1.10 GPa, the frequency was 10 Hz, the stroke was 3 mm, and the wear time of each sample was 30 min. An optimal SRV-4 high temperature tribotester (Optimol, Munich, Germany) was used for the wear test.…”

Section: Tribological Testmentioning

confidence: 99%

High Temperature Dry Tribological Behavior of Nb-Microalloyed Bearing Steel 100Cr6

Zhu

Zhang

et al. 2021

Materials

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100Cr6 steel is one of the most widely used bearing steels and a representative of first-generation bearing steel. Many engineering applications require rolling bearings to run at a high temperature. Therefore, it is necessary to improve the high temperature properties of 100Cr6 steel. In this paper, the effect of Nb on high temperature dry tribological behavior, including worn surface and friction coefficient, was analyzed by a wear test when Nb content was 0.018% and 0.040%. The results show that the microstructure is refined gradually, the hardness is improved, and wear volume decreases by 31.8% at most with the increase of Nb content. At 50 °C, the friction coefficient of 100Cr6 steel can be reduced by adding a small amount of Nb, but this effect will be weakened if the content of Nb is too high. In addition, excess Nb increases the hard precipitation of NbC, which aggravates the abrasive wear and leads to the increase in the depth of the worn surface. At 125 °C, the effect of Nb on tribological properties is weaker. With the increase of temperature, the steel substrate softens, and the oxide particles increase, which aggravates the abrasive wear and oxidation wear and makes the wear volume increase significantly.

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Contact mechanics

Cited by 27 publications

References 0 publications

A new explanation of Rolling Contact Fatigue in bearing steels based on multiscale models

A new explanation of Rolling Contact Fatigue in bearing steels based on multiscale models

Tolerance analysis of planar parts with skin modeling considering spatial distribution characteristics of surface morphology and local surface deformations

High Temperature Dry Tribological Behavior of Nb-Microalloyed Bearing Steel 100Cr6

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