New Fractal Contact Model Considered Multi-scale Levels

Yun, Ruide

doi:10.3901/jme.2019.09.080

Cited by 3 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The rough surface is formed by the accumulation of many micro-asperities. As shown in Figure 2, the contact between two rough surfaces is simplified to a rough surface in contact with a smooth surface [38]. The increase in the normal deformation of the joint will intensify the relative interaction between the asperities.…”

Section: Micro-asperity Deformationmentioning

confidence: 99%

A Joint Surface Contact Stiffness Model Considering Micro-Asperity Interaction

Xia,

Qu,

Liu

2024

Aerospace

View full text Add to dashboard Cite

Mechanical joint interfaces are widely found in mechanical equipment, and their contact stiffness directly affects the overall performance of the mechanical system. Based on the fractal and elastoplastic contact mechanics theories, the K-E elastoplastic contact model is introduced to establish the contact stiffness model for mechanical joint interfaces. This model considers the interaction effects between micro-asperities in the fully deformed state, including elasticity, first elastoplasticity, second elastoplasticity, and complete plastic deformation state. Based on this model, the effects of fractal parameters on normal contact stiffness and contact load are analyzed. It can be found that the larger fractal dimension D or smaller characteristic scale coefficient G will weaken the interaction between micro-asperities. The smoother processing surfaces lead to higher contact stiffness in mechanical joint interfaces. The applicability and effectiveness of the proposed model are verified by comparing it with the traditional contact model calculation results. Under the same load, the interaction between micro-rough surfaces leads to an increase in both overall deformation and contact stiffness. The accuracy of the predicted contact stiffness model is also validated by comparing it with experimental results.

show abstract

Section: Micro-asperity Deformationmentioning

confidence: 99%

A Joint Surface Contact Stiffness Model Considering Micro-Asperity Interaction

Xia,

Qu,

Liu

2024

Aerospace

View full text Add to dashboard Cite

show abstract

“…At this time, friction occurs sharply, so the friction coefficient changes greatly. With the end of the running and wear stages, the top of the micro peaks on the surface of the material is ground off, the roughness decreases, the actual contact area increases, the number of contact points increases, and the friction becomes stable [47], so the friction coefficient is stable at about 0.62. Compared with the friction coefficient of grade 45 steel, the friction coefficient of 20% Ni/MoS 2 cladding is smaller in both running and wear stages and stable wear stages, which is due to the formation of NiS, Cr 2 S 3 , MoS 2 and CrMo 3 S 4 metal sulfides in the cladding layer caused by the addition of nickel coated MoS 2 .…”

Section: Wear Resistancementioning

confidence: 99%

Study on Microstructure and Properties of Nickel-Based Self-Lubricating Coating by Laser Cladding

Chen

Yang

et al. 2022

Coatings

View full text Add to dashboard Cite

Ni35 + 20% SiC + 20% Ni/MoS2 self-lubricating coatings were fabricated on a grade 45 steel surface by laser cladding to obtain better comprehensive performance of wear resistance and corrosion resistance. The macroscopic morphology, microstructure, microhardness, phase composition, corrosion resistance and wear resistance of the coatings were investigated. The results show that the microstructure of the cladding layer is dense, mainly composed of cellular crystal and equiaxed crystal; The average microhardness of the coating is about 700 HV; The phase composition of the coating mainly includes Ni-Cr-Fe solid solution and metal sulfide, such as MoS2, NiS, Cr2S3, and CrMo3S4; Under the simulated seawater environment of 3.5% NaCl, the self-corrosion potential is 0.052 V and the self-corrosion current density is 1.69 × 10−5 A∙cm2. Compared with grade 45 steel, the corrosion resistance is greatly improved; After 20 min of wear, the weight loss of the cladding layer is about 0.17 times that of the grade 45 steel, the friction coefficient is small, and the wear resistance is significantly improved.

show abstract

Wear Prediction Model Based on the Fractal Contact Characteristics

Yun

Ding

2020

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

A new fractal wear model is proposed. The new model is based on the multi-scale fractal contact model. Studying the elastoplastic and plastic state of contact asperities, the new wear model is established. The relationship between the amount of contact surface wear and the fractal dimension D, the characteristic coefficient G and the material property constant C is studied. Besides, wear coefficient of the rough contact surface is predicted. It can be seen from the results that the influence of the scale effect on contact surface must be considered, because of the asperities with the same deformation ?? will be in different contact state. The relationship between amount of wear in the new model and amount of wear in existing model has the same trend. When D = 1.45, the amount of wear is the lowest. With the increasing of G reflecting the roughness of contact surface, the wear amount is increasing. The material constant also has a certain influence on the wear amount, and the material with high hardness has low wear. The contributions of the amount of asperity wear (elastoplastic and plastic) have the same effect to the total wear amount. Besides, the result of new fractal wear coefficient and the result of classical have the same trend, however, the new wear model is more precise than the classical wear model and closer to the actual state.

show abstract

New Fractal Contact Model Considered Multi-scale Levels

Cited by 3 publications

References 1 publication

A Joint Surface Contact Stiffness Model Considering Micro-Asperity Interaction

A Joint Surface Contact Stiffness Model Considering Micro-Asperity Interaction

Study on Microstructure and Properties of Nickel-Based Self-Lubricating Coating by Laser Cladding

Wear Prediction Model Based on the Fractal Contact Characteristics

Contact Info

Product

Resources

About