Estimation for normal contact stiffness of joint surfaces by considering the variation of critical deformation

Sun, Qingchao; Liu, Xin; Mu, Xiaokai; Gao, Yawei

doi:10.1108/aa-03-2019-0059

“…On the basis of KE model, the influence of interaction between asperities on the normal contact stiffness is considered by introducing the fractal dimension D( 12 D  ) of rough surface profiles [28]. Based on the fractal model, the normal contact stiffness K0 of joint surfaces can be expressed as follows [29]:…”

Section: Normal Contact Stiffness Of the Remaining Zonementioning

confidence: 99%

Theoretical and Experimental Study on Normal Contact Stiffness of Plane Joint Surfaces With Surface Texturing

Yin

¹

,

Huang

²

,

Zhou

³

et al. 2023

Tribology Transactions

3

0

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Effects of surface texturing on the normal contact stiffness of joint surfaces had been investigated by experiments in many previous researches; however, there are relatively few theoretical models in this regard. The rough surface with surface texturing can be divided into two parts: the textured zone and the remaining zone, and their theoretical models are established respectively in this research considering surface morphology and material properties. For the textured zone, micro textures are modeled theoretically based on the three-dimensional topographic data obtained via a VK-X250 type laser profilometer from KEYENCE. For the remaining zone, the model of normal contact stiffness is established based on the fractal theory for the surface topography description and elastoplastic deformation of surface asperities, and the structure function method is used to calculate the fractal dimension of rough surface profiles. In the experiment, the normal contact stiffness of specimens is obtained under different normal loads, and the test results are compared with the theoretical predictions. The result shows that the predictions of proposed theoretical model are in good agreement with the experimental data. For the joint surfaces with Sa > 2.69 μm, the normal contact stiffness can be effectively increased through proper surface texturing.

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“…of rough surface profiles [28]. Based on the fractal model, the normal contact stiffness K0 of joint surfaces can be expressed as follows [29]:…”

Section: Normal Contact Stiffness Of the Remaining Zonementioning

confidence: 99%

Theoretical and Experimental Study on Normal Contact Stiffness of Plane Joint Surfaces with Surface Texturing

Yin¹,

Huang²,

Zhou³

et al. 2021

Preprint

0

View full text Add to dashboard Cite

Effects of surface texturing on the normal contact stiffness of joint surfaces had been investigated by experiments in many previous researches; however, there are relatively few theoretical models in this regard. The rough surface with surface texturing can be divided into two parts: the textured zone and the remaining zone, and their theoretical models are established respectively in this research considering surface morphology and material properties. For the textured zone, micro textures are modeled theoretically based on the three-dimensional topographic data obtained via a VK-X250 type laser profilometer from KEYENCE. For the remaining zone, the model of normal contact stiffness is established based on the fractal theory for the surface topography description and elastoplastic deformation of surface asperities, and the structure function method is used to calculate the fractal dimension of rough surface profiles. In the experiment, the normal contact stiffness of specimens is obtained under different normal loads, and the test results are compared with the theoretical predictions. The result shows that the predictions of proposed theoretical model are in good agreement with the experimental data. For the joint surfaces with Sa > 2.69 μm, the normal contact stiffness can be effectively increased through proper surface texturing.

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“…Furthermore, the contact stiffness calculation model of single asperity was brought forward by considering critical deformation change. Owing to the possibility of plastic deformation during the loading process, the experimental curve was nonlinear, resulting in an error between the experimental results and the theoretical calculation results [9]. Liu et al aimed to improve the computational accuracy of the fractal dimension of the profile curve, and a two-stage method based on the power spectrum method and the structure-function method was proposed [10].…”

Section: Introductionmentioning

confidence: 99%

Time-Varying Wear Calculation Method for Fractal Rough Surfaces of Friction Pairs

Hao

¹

,

Yin

²

,

Liu

³

et al. 2023

Coatings

3

0

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For the wear problem of the real rough surface during sliding friction, based on fractal theory and Hertz contact theory, a 3-D fractal rough surface with random characteristics is constructed, and the relationship between the wear deformation depth of the rough peak and its real contact area during the wear process is derived. Furthermore, considering the peak wear and pit scratch phenomena of rough surfaces in different contact states, the time-varying wear calculation model of the worn surface and the compensation wear calculation model of the unworn surface are established, respectively, and the relationship between the instantaneous wear amount and the dynamic change in the rough surface topography is comprehensively characterized. Combined with image digitization technology, the 3-D rough surface is converted into a 2-D discrete plane with 3-D information. According to the dynamic real-time update of the graph data, the iterative calculation of the wear cycle is completed, the time-varying wear calculation method for fractal rough surfaces of friction pairs is proposed, and the dynamic change in the wear amount and surface topography of the rough surface is simulated. The simulation results are experimentally verified and the influence of friction parameters on the surface topography is analyzed. The results show that after the wear simulation, the profile height of the rough surface is reduced, and the average wear depth is 0.02 mm. Increases in rotational speeds and external loads can exacerbate surface wear, surface topography tends to be flattened, and surface carrying capacity increases. This provides theoretical guidance for the development and manufacture of friction pairs.

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Estimation for normal contact stiffness of joint surfaces by considering the variation of critical deformation

Cited by 20 publications

References 15 publications

Theoretical and Experimental Study on Normal Contact Stiffness of Plane Joint Surfaces With Surface Texturing

Theoretical and Experimental Study on Normal Contact Stiffness of Plane Joint Surfaces With Surface Texturing

Theoretical and Experimental Study on Normal Contact Stiffness of Plane Joint Surfaces with Surface Texturing

Time-Varying Wear Calculation Method for Fractal Rough Surfaces of Friction Pairs

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