A Numerical Simulation of Fretting Wear considering the Dynamic Evolution of Debris for the Coated Contact Surface

2021 ◽  
pp. 1-49
Author(s):  
Li Xiao ◽  
Yingqiang Xu ◽  
Zhiyong Chen
Keyword(s):  
Fretting Wear ◽  
Contact Pair ◽  
Dynamic Evolution ◽  
Wear Depth ◽  
Wear Coefficient ◽  
Wear Model ◽  
Wear Process ◽  
Dlc Coating ◽  
Wear Life ◽  
Wear Calculation

Abstract In this paper, a multi-layer body model in which material properties and wear coefficient change with node coordinates is proposed, so that the wear profile is not restricted by the singularity of the interface of the coated contact pairs. The conversion rate of the adhered particles was obtained to describe the growth and expansion of the debris at the fretting interface based on experiments, and the wear model of coated contact pair considering the dynamic evolution of the debris layer was established. By comparing the previous experimental and computational results, the wear calculation method proposed in this paper is more reasonable to predict the wear profile of the coated contact pair. In addition, the influence of the debris layer on the wear depth, friction width, and contact pressure in the fretting process is analyzed, indicating that the existence of the debris layer can delay the wear process. Finally, the fretting wear life of the SCMV steel contact pair deposited with the W-DLC coating is estimated.

Coupling fractal model for fretting wear on rough contact surfaces

2020 ◽  
pp. 1-32
Author(s):  
Yi Wang ◽  
Gang Liang ◽  
Shuo LIU ◽  
Yi Cui
Keyword(s):  
Contact Surface ◽  
Fractal Theory ◽  
Three Dimensional ◽  
Parameter Analysis ◽  
Fretting Wear ◽  
Wear Depth ◽  
Contact Parameter ◽  
Wear Process ◽  
Actual Surface ◽  
Fractal Parameters

Abstract In this paper, a fretting damage model based on fractal theory is proposed. The Weierstrass-Mandelbrot function of fractal theory is used to represent the rough contact surface, and a corresponding contact parameter analysis method is also established. Based on neural network algorithm, the values of fractal parameters are fitted, and the fitting accuracy has been greatly improved compared with traditional methods. According to the fractal parameters of the actual surface, the fretting wear process of the rough contact surface is analyzed based on theory of adhesive and three body abrasive wear. A generic program for the analysis of three-dimensional fretting wear problems is also proposed. Compared with material tests, the prediction error of fretting wear simulation model is 13.4% for wear depth and 16.7% and 3.9% for width and length of wear scar in stable wear stage. The prediction results show that the model can be applied to the prediction of the actual three-dimensional fretting wear model.

Numerical Study on Fretting Wear of Mating Surface Between Piston Crown and Skirt in Heavy Duty Diesel Engine

2019 ◽  
Vol 141 (8) ◽  
Author(s):  
Yi Wang ◽  
Limin Wu ◽  
Shuo Liu ◽  
Mei Li ◽  
Xianghui Meng ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Fretting Wear ◽  
Wear Depth ◽  
Heavy Duty ◽  
Wear Model ◽  
Piston Skirt ◽  
Piston Crown ◽  
Mating Surface ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

Composite pistons are often used in heavy duty diesel engines due to its good reliability and durability. Owing to the alternating loads, fretting wear usually happens on the mating surfaces between piston crown and skirt. In this paper, a fretting wear finite element model is developed to analyze the mating surface wear of composite piston of heavy-duty diesel engine. The fretting wear model predicts the wear depth evolution for each working cycle based on Archard model and mesh updating technique, which is validated by previous pin and disk contact experiments. The wear evolution of the top contact surface of piston skirt is simulated according to engine operating condition, and fretting wear life is estimated by the decreasing process of crown-skirt connecting bolt preload. Effects of the shape of piston skirt top surface are also evaluated. In the end, the rationality of fretting wear model is validated by durability tests of diesel engine.

Flank Wear Model of Cutting Tools Using Control Theory

1978 ◽  
Vol 100 (1) ◽  
pp. 103-109 ◽  
Author(s):  
Y. Koren
Keyword(s):  
Control Theory ◽  
Tool Life ◽  
Flank Wear ◽  
Cutting Tools ◽  
Mathematical Expression ◽  
Wear Coefficient ◽  
Wear Model ◽  
Wear Process ◽  
Thermally Activated ◽  
Linear Control Theory

A model of the flank wear of cutting tools is developed by using linear control theory. The flank wear is assumed to consist of a mechanically activated and a thermally activated component. The wear process is mathematically treated as a feedback process, whereby the progressive wear raises the cutting forces and temperature thereby increasing the thermally activated wear-rate, and contributes to the mechanically activated wear. A mathematical expression for the flank wear growth is derived and shown to be consistent with experimental results. The experimental data is fitted to the wear model for calculating the mechanical wear coefficient and activation energy for the thermally activated wear. The model yielded a new tool-life equation which is valid over a wider range of speed than Taylor tool-life equation.

Some Results on the Random Wear Coefficient of the Archard Model

2012 ◽  
Vol 79 (5) ◽  
Author(s):  
Fabio Antonio Dorini ◽  
Rubens Sampaio
Keyword(s):  
Probability Density Function ◽  
Probability Density ◽  
Density Function ◽  
Maximum Entropy Principle ◽  
Linear Wear ◽  
Wear Depth ◽  
Wear Coefficient ◽  
Wear Process ◽  
Entropy Principle ◽  
Wear Law

The most used model for predicting wear is the linear wear law proposed by Archard. A common generalization of Archard’s wear law is based on the assumption that the wear rate at any point on the contact surface is proportional to the local contact pressure and the relative sliding velocity. This work focuses on a stochastic modeling of the wear process to take into account the experimental uncertainties in the identification process of the contact-state dependent wear coefficient. The description of the dispersion of the wear coefficient is described by a probability density function, which is performed using the maximum entropy principle using only the information available. Closed-form results for the probability density function of the wear depth for several situations that commonly occur in practice are provided.

Numerical Study on Fretting Wear of Mating Surface Between Piston Crown and Skirt in Heavy Duty Diesel Engine

2018 ◽  
Author(s):  
Yi Wang ◽  
Limin Wu ◽  
Shuo Liu ◽  
Mei Li ◽  
Xianghui Meng ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Fretting Wear ◽  
Wear Depth ◽  
Heavy Duty ◽  
Wear Model ◽  
Piston Skirt ◽  
Piston Crown ◽  
Mating Surface ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

Composite pistons are often used in heavy duty diesel engines due to its good reliability and durability. Owing to the alternating loads, fretting wear usually happens on the mating surfaces between piston crown and skirt. In this paper, a fretting wear finite element model is developed to analyze the mating surface wear of composite piston of heavy duty diesel engine. The fretting wear model predicts the wear depth evolution for each working cycle based on Archard model and mesh updating technique, which is validated by previous pin and disk contact experiments. The wear evolution of the top contact surface of piston skirt is simulated according to engine operating condition, and fretting wear life is estimated by the decreasing process of crown-skirt connecting bolt preload. Effects of the shape of piston skirt top surface is also evaluated. In the end, the rationality of fretting wear model is validated by durability tests of diesel engine.

The Wear Model Parameters Research of Cone Ring Sliding Plate on Tire Segmented Mould

2012 ◽  
Vol 501 ◽  
pp. 427-430
Author(s):  
Hai Ming Hu ◽  
Xiao Bin Li ◽  
Zhong Ke Tian
Keyword(s):  
Model Parameters ◽  
Wear Depth ◽  
Wear Coefficient ◽  
Wear Model ◽  
The Future ◽  
Solid Foundation ◽  
Sliding Plate

This paper researched the mating surfaces between sliding plates on cone ring and segment holders and discussed vertical clearance between segments caused by wear. Relationships between wear depth and parameter a, b, c and wear coefficient K of Archard wear model were analyzed. This work laid a solid foundation for confirming these coefficients accurately in the future.

Numerical Simulation of Fretting Wear in Press-Fitted Shaft Considering the Running-In Period

2009 ◽  
Vol 417-418 ◽  
pp. 717-720 ◽  
Author(s):  
Dong Hyung Lee ◽  
Seok Jin Kwon ◽  
Won Hee You
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Approach ◽  
Simulation Technique ◽  
Experimental Results ◽  
Fretting Wear ◽  
Wear Simulation ◽  
Wear Coefficient ◽  
Element Analysis ◽  
Wear Process

In this paper the fretting wear simulation technique with the press-fitted specimens have been developed, which can consider the running-in period of total wear process by adopting nonlinear wear coefficient. The amount of microslip and contact variable at press-fitted and at bending loaded condition of press-fitted shaft was analysed by applying finite element method. With the finite element analysis result, a numerical approach was applied to predict fretting wear based on modified Archard's equation and updating the change of contact pressure caused by local wear with influence function method. The predicted wear profiles of press-fitted specimens at the contact edge were compared with the experimental results obtained by rotating bending fatigue tests. It is shown that the predicted wear profiles considering the running-in period with nonlinear wear coefficent is consistent with experimental results than that with constant wear coefficient. Therefore, the fretting wear simulation technique proposed is feasible and efficient for numerical simulation of fretting wear on press fits at the initial stage of fatigue life.

Determining the Number of Peaks of Rough Surfaces Necessary for Wear Calculation

2014 ◽  
Vol 604 ◽  
pp. 59-62 ◽  
Author(s):  
Oskars Linins ◽  
Armands Leitans ◽  
Guntis Springis ◽  
Janis Rudzitis
Keyword(s):  
Working Conditions ◽  
Sliding Friction ◽  
Friction Pair ◽  
Calculation Model ◽  
Fatigue Wear ◽  
Wear Model ◽  
Wear Process ◽  
Wear Calculation ◽  
Service Conditions ◽  
Micro Topography

The problem of evaluating the life period of different mechanisms is of great importance nowadays. This could be explained by the fact that the wear process is very complex and very many factors take place simultaneously. During the history a variety of theories that offered different methods of wear calculation models were developed. However still there is no exact wear calculation model that could be applied to all cases of wear processes. The offered method is dealing with the calculation of rough surface peaks that make the contact between two surfaces. Taking into account the number of these peaks and applying fatigue wear model based on 3D surface micro-topography, assessing the materials physical and mechanical characteristic quantities and considering definite service conditions of sliding friction pair it is possible to make the wear calculation of friction pair under definite working conditions.

scholarly journals Simulation and Experimental Study on Wear of U-Shaped Rings of Power Connection Fittings under Strong Wind Environment

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 735
Author(s):  
Songchen Wang ◽  
Xianchen Yang ◽  
Xinmei Li ◽  
Cheng Chai ◽  
Gen Wang ◽  
...  
Keyword(s):  
Abrasive Wear ◽  
Adhesive Wear ◽  
Surface Hardness ◽  
Wear Depth ◽  
Strong Wind ◽  
Wear Model ◽  
Wind Environment ◽  
Simulation Results ◽  
Oxidation Wear ◽  
Good Agreement

The objective of this study was to investigate the wear characteristics of the U-shaped rings of power connection fittings, and to construct a wear failure prediction model of U-shaped rings in strong wind environments. First, the wear evolution and failure mechanism of U-shaped rings with different wear loads were studied by using a swinging wear tester. Then, based on the Archard wear model, the U-shaped ring wear was dynamically simulated in ABAQUS, via the Umeshmotion subroutine. The results indicated that the wear load has an important effect on the wear of the U-shaped ring. As the wear load increases, the surface hardness decreases, while plastic deformation layers increase. Furthermore, the wear mechanism transforms from adhesive wear, slight abrasive wear, and slight oxidation wear, to serious adhesive wear, abrasive wear, and oxidation wear with the increase of wear load. As plastic flow progresses, the dislocation density in ferrite increases, leading to dislocation plugs and cementite fractures. The simulation results of wear depth were in good agreement with the test value of, with an error of 1.56%.

scholarly journals Wear Calculation for Sliding Friction Pairs

2014 ◽  
Vol 51 (2) ◽  
pp. 41-54 ◽  
Author(s):  
G. Springis ◽  
J. Rudzitis ◽  
A. Avisane ◽  
A. Leitans
Keyword(s):  
Service Life ◽  
Sliding Friction ◽  
Theoretical Calculations ◽  
Quality Level ◽  
Wear Process ◽  
Measuring Devices ◽  
Proposed Model ◽  
Wear Calculation ◽  
Production Technologies ◽  
Micro Topography

Abstract One of the principal objectives of modern production process is the improvement of quality level; this means also guaranteeing the required service life of different products and increase in their wear resistance. To perform this task, prediction of service life of fitted components is of crucial value, since with the development of production technologies and measuring devices it is possible to determine with ever increasing precision the data to be used also in analytical calculations. Having studied the prediction theories of wear process that have been developed in the course of time and can be classified into definite groups one can state that each of them has shortcomings that might strongly impair the results thus making unnecessary theoretical calculations. The proposed model for wear calculation is based on the application of theories from several branches of science to the description of 3D surface micro-topography, assessing the material’s physical and mechanical characteristics, substantiating the regularities in creation of the material particles separated during the wear process and taking into consideration definite service conditions of fittings.

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