Prediction of Steady State Adhesive Wear in Spur Gears Using the EHL Load Sharing Concept

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
S. Akbarzadeh ◽  
M. M. Khonsari
Keyword(s):  
Steady State ◽  
Wear Rate ◽  
Thermal Effects ◽  
Sliding Wear ◽  
Adhesive Wear ◽  
Load Sharing ◽  
Spur Gears ◽  
Wear Model ◽  
Wear Calculation ◽  
Simulation Results

The concept of load sharing between asperities and fluid film is applied in conjunction with lubricated sliding wear formulation proposed by Wu and Cheng (1991, “A Sliding Wear Model for Partial-EHL Contacts,” ASME J. Tribol., 113, pp. 134–141; 1993, “Sliding Wear Calculation in Spur Gears,” ASME J. Tribol., 115, pp. 493–500) to predict the steady state adhesive wear in gears. Thermal effects are included using a simplified thermoelastohydrodynamic analysis. The prediction of the model is verified by comparing simulation results with published experimental data pertinent to steady state wear rate. The main advantages of this method are the accuracy and the remarkable computational efficiency. The results of parametric simulation study are presented to investigate the effect of speed and surface roughness on a portion of load carried by asperities and wear rate.

Sliding Wear Calculation in Spur Gears

1993 ◽  
Vol 115 (3) ◽  
pp. 493-500 ◽  
Author(s):  
Shifeng Wu ◽  
H. S. Cheng
Keyword(s):  
Wear Rate ◽  
Sliding Wear ◽  
Elastohydrodynamic Lubrication ◽  
Tooth Wear ◽  
Spur Gears ◽  
Gear Teeth ◽  
Tooth Surfaces ◽  
Wear Calculation ◽  
Determining Factor ◽  
Wear Region

In gear applications where precipitous tooth failure mode such as scoring or scuffing has been avoided, “normal” wear becomes a life-determining factor. In this paper, sliding wear in spur gears, including the considerations of gear dynamics and rough-elastohydrodynamic lubrication, is analyzed. Formulas for equivalent wear rate and tooth wear profile along the line of action are derived. Results show that most materials are removed from both the addendum and dedendum tooth surfaces, and that the highest wear occurs at the beginning of an engagement. This high wear region corresponds to the root of the driving (pinion) teeth and the tip of the driven (gear) teeth. These analytical results correlate well with the practical evidences in AGMA documentation.

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%.

Effect of profile modification on the performance of spur gears in isothermal mixed-EHL regime using load-sharing concept

2018 ◽  
Vol 233 (6) ◽  
pp. 936-948 ◽  
Author(s):  
Masoud Kimiaei ◽  
Saleh Akbarzadeh
Keyword(s):  
Wear Rate ◽  
Power Transmission ◽  
Elastohydrodynamic Lubrication ◽  
Load Sharing ◽  
Spur Gears ◽  
Gear Teeth ◽  
Profile Modification ◽  
Model Based ◽  
Mechanical Element ◽  
The Cost

Spur gears are one of the most important tools for power transmission in the industry and thus can be considered a key mechanical element. As a result of power transmission, gears might fail or experience wear and fatigue. So the improvement in the design and modification of tooth profile of gears can significantly reduce friction loss and wear of the gear teeth and therefore it increases the useful life, improves the quality, and reduces the cost. The purpose of this study is to show the influence of addendum modification on the tribological performance of spur gears which are operating in the mixed elastohydrodynamic lubrication. In this paper, a model based on the load-sharing concept is employed to study the effect of changing addendum modification on the performance of spur gears, the amount of wear rate, and the lubricant film thickness. To this end, a model based on the load-sharing concept is employed which takes the geometry and lubricant properties as input and predicts the friction coefficient, load carried by fluid film and asperities, efficiency, and wear rate as output.

An Analytical Model for Dynamic Wear

1989 ◽  
Vol 111 (3) ◽  
pp. 468-474 ◽  
Author(s):  
Ji-Yi Lin ◽  
H. S. Cheng
Keyword(s):  
Steady State ◽  
Stress Field ◽  
Wear Rate ◽  
Frictional Force ◽  
Wear Behavior ◽  
Time Dependent ◽  
Material Strength ◽  
Wear Model ◽  
Asperity Contacts ◽  
Dynamic Wear

A wear model which permits the wear rate to be dependent on time is introduced to study the dynamic wear behavior observed in practice. In this model, it is postulated that the wear rate is proportional to a forcing term, I, which is contributed by the stress field induced by the frictional force at the asperity contacts; and inversely proportional to a wear resisting term, S, which is related to the material antiwear strength near the surface. One of the important characteristics of the dynamic wear model is that both I and S are now time dependent or wear dependent because when wear progresses the material strength at various layers would change and the stress field would also change as a result of the change of surface topography. Using this dynamic wear model, it is shown that the commonly observed running-in, steady-state, or accelerated wear phenomena can be explained.

A Novel Model of Steady-State Sliding Wear with Electrical Current

2011 ◽  
Vol 306-307 ◽  
pp. 782-786
Author(s):  
Zhen Hai Yang ◽  
Yong Zhen Zhang ◽  
Fu Xiao Chen ◽  
Bao Shangguan
Keyword(s):  
Steady State ◽  
Wear Rate ◽  
Contact Pressure ◽  
Sliding Wear ◽  
Electrical Current ◽  
Sliding Velocity ◽  
Novel Model

A novel model of steady-state sliding wear with electrical current was created, which gives an accurate relational expression of three factors (electrical current, sliding velocity and contact pressure) and wear rate of the pin material. The experiments were carried out on the couple of QCr0.5 against copper-based powder metallurgical materials. The results show that the model is accurate and it is able to clearly show the influence of electrical current, sliding velocity and contact pressure on wear rate of pin.

Simulation of Tool Wear in Prestressed Cutting Superalloys

2016 ◽  
Vol 836-837 ◽  
pp. 402-407
Author(s):  
Rui Tao Peng ◽  
Jing Li ◽  
Xin Zi Tang ◽  
Zhuan Zhou
Keyword(s):  
Finite Element ◽  
Wear Rate ◽  
Tool Wear ◽  
High Speed ◽  
Cutting Temperature ◽  
Cutting Parameters ◽  
Tool Geometry ◽  
Wear Model ◽  
Element Analysis ◽  
Wear Calculation

In high speed machining superalloys processes, tool wear is strongly influenced by the cutting temperature and contact stresses. Finite element analysis of machining can be used as a supplementary to the physical experiment, this paper provides investigations in 2D and 3D finite element modeling and simulation of prestressed cutting for GH4169 superalloy, a tool wear model for the specified tool and workpiece pair is developed based on the Usui's wear model, furthermore, tool temperature, wear rate and nodal displacement on the face of tool in prestressed cutting of superalloy is analyzed under various prestress condition and cutting parameters, and Python language is adopted to modify the Abaqus code used to allow tool wear calculation and tool geometry updating. The results of the simulation indicate that the tool wear rate increases with the increase of cutting time, and the influence of the prestress to tool wear in prestressed cutting process of shaft part is unremarkable.

On the prediction of steady-state wear rate in spur gears

Wear ◽  
2015 ◽  
Vol 342-343 ◽  
pp. 234-243 ◽  
Author(s):  
M. Masjedi ◽  
M.M. Khonsari
Keyword(s):  
Steady State ◽  
Wear Rate ◽  
Spur Gears

scholarly journals Analysis of the Screw Flight Wear Model and Wear Regularity of the Bulk Transport in Screw Ship Unloader

2021 ◽  
Author(s):  
Weijie Yang ◽  
Wenjun Meng ◽  
Lingchong Gao ◽  
Yuan Tan ◽  
Johannes Fottner ◽  
...  
Keyword(s):  
Wear Rate ◽  
Working Conditions ◽  
Continuous Medium ◽  
Calculation Model ◽  
Filling Rate ◽  
Wear Model ◽  
Spiral Blade ◽  
Simulation Results ◽  
Wear Law

AbstractThe screw flight, spiral blade welded on the axial cylinder, is the core component of the screw ship unloader and can be seriously worn by the materials during long-term conveying. The damaged screw flight will make the screw ship unloader unable to unload materials or even lead to an accident. However, the existing wear model cannot be directly applied to predict the wear of the screw flight under different working conditions. Hence, we established a new screw flight wear model based on the Archard wear model and Continuous Medium Hypothesis to predict the service life of the screw flight. Three influencing factors, including speed, filling rate, and pitch, were selected to study the wear law of the screw flight, and the wear law was verified by EDEM simulation. Results indicate that the simulation results affected by the changes in various factors were consistent with the calculation model. With the increase of rotation speed and filling rate, the screw flight wear rate increased. Nevertheless, with the increase of pitch, the screw flight wear rate first increased and then decreased. The screw flight wear model can be used to calculate the wear rate under different working conditions for the screw flight life prediction.

scholarly journals Wear Characteristics of Different Groove-Shaped Friction Pairs of a Friction Clutch

2020 ◽  
Vol 11 (1) ◽  
pp. 284
Author(s):  
Heyun Bao ◽  
Chao Zhang ◽  
Xiaonan Hou ◽  
Fengxia Lu
Keyword(s):  
Adhesive Wear ◽  
Friction Pair ◽  
Wear Test ◽  
Calculation Model ◽  
Wear Model ◽  
Wear Performance ◽  
Friction Clutch ◽  
Wear Calculation ◽  
The Mathematical Model ◽  
Sliding Distance

To investigate the influence of the groove shape of friction disks on the wear of a friction clutch friction pair, a wear calculation model that considers the actual sliding distance between the friction clutch friction pair is presented based on the Archard adhesive wear model. The wear of three different groove-shaped friction pairs was calculated and analyzed. The wear test was carried out on the SAE#2 testing rig to obtain the actual wear amount and verify the accuracy and validity of the mathematical model. The results show that, among the three types of grooves, the friction disks with waffle grooves were the most prone to wear, followed by three-way parallel grooves. The wear performance of the two-way parallel grooves was the best, and the wear from one-time engagement can better reflect the change in the dynamic engagement of the friction pair. With the increase in the engagement time, the increase of the wear amount decreases.

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