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Research Papers: Contact Mechanics

A Subscale Experimental Investigation on the Influence of Sanding on Adhesion and Rolling Contact Fatigue of Wheel/Rail Under Water Condition

[+] Author and Article Information
Wanliang Huang

State Key Laboratory of Traction Power,
Tribology Research Institute,
Southwest Jiaotong University,
Chengdu 610031, China
e-mail: piaobozhilv@sina.cn

Xi Cao

State Key Laboratory of Traction Power,
Tribology Research Institute,
Southwest Jiaotong University,
Chengdu 610031, China
e-mail: cx910319@163.com

Zefeng Wen

State Key Laboratory of Traction Power,
Tribology Research Institute,
Southwest Jiaotong University,
Chengdu 610031, China
e-mail: zfwen@home.swjtu.edu.cn

Wenjian Wang

State Key Laboratory of Traction Power,
Tribology Research Institute,
Southwest Jiaotong University,
Chengdu 610031, China
e-mail: wwj527@swjtu.cn

Qiyue Liu

State Key Laboratory of Traction Power,
Tribology Research Institute,
Southwest Jiaotong University,
Chengdu 610031, China
e-mail: liuqy@swjtu.cn

Minhao Zhu

State Key Laboratory of Traction Power,
Tribology Research Institute,
Southwest Jiaotong University,
Chengdu 610031, China
e-mail: zhuminhao@home.swjtu.edu.cn

Xuesong Jin

State Key Laboratory of Traction Power,
Tribology Research Institute,
Southwest Jiaotong University,
Chengdu 610031, China
e-mail: xsjin@home.swjtu.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received October 11, 2015; final manuscript received February 8, 2016; published online July 20, 2016. Assoc. Editor: James R. Barber.

J. Tribol 139(1), 011401 (Jul 20, 2016) (8 pages) Paper No: TRIB-15-1370; doi: 10.1115/1.4033100 History: Received October 11, 2015; Revised February 08, 2016

With a subscale rolling-sliding apparatus, the objective of this study is to explore the adhesion and rolling contact fatigue characteristics of wheel/rail rollers with sanding under water condition. Sanding improves adhesion coefficient but aggravates the surface damage of wheel and rail materials. With the particle diameter and feed rate increasing, the adhesion coefficient is further improved. However, the surface damage (spalling and pits) becomes severer as well as the surface roughness. Note that pitting is a special damage type when sanding is used to improve the adhesion. Big pits and fatigue cracks appear on subsurface under larger particle diameter and feed rate conditions. Severe cracks initiate from big pits and develop into material to a depth, which results in bulk material breaking.

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Figures

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Fig. 1

Scheme size of the rollers and application of the sanding: (a) scheme size of the rollers and (b) diagrammatic sketch of the sanding

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Fig. 2

Photographs of the tested sands: (a) S size, (b) M size, (c) L size, and (d) XL size

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Fig. 3

Adhesion coefficient of wheel/rail rollers under water conditions: (a) particle diameter (10 g/min) and (b) feed rate (M sand)

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Fig. 4

Increase in surface roughness of worn surface of wheel/rail rollers: (a) particle diameter (10 g/min) and (b) feed rate (M sand)

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Fig. 5

Effect of sanding parameters on surface hardness of wheel/rail rollers under the water condition: (a) particle diameter and (b) feed rate

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Fig. 6

SEM micrographs of worn surface of wheel/rail rollers under different particle sizes conditions: (a) water, (b) S sand, (c) M sand, (d) L sand, and (e) XL sand

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Fig. 7

SEM micrographs of worn surface of wheel/rail rollers under different feed rate conditions: (a) 5 g/min, (b) 10 g/min, and (c) 15 g/min

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Fig. 8

OM micrographs of longitudinal section of wheel/rail rollers under different particle sizes conditions: (a) S sand, (b) M sand, (c) L sand, and (d) XL sand

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Fig. 9

OM micrographs of longitudinal section of wheel/rail rollers under different feed rate conditions: (a) 5 g/min, (b) 10 g/min, and (c) 15 g/min

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Fig. 10

SEM micrographs of longitudinal section of wheel/rail rollers without sanding under water condition: (a) wheel and (b) rail

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Fig. 11

SEM micrographs of longitudinal section of wheel/rail rollers in M sand and 10 g/min: (a) wheel and (b) rail

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Fig. 12

SEM micrographs of longitudinal section of wheel/rail rollers in XL sand and 10 g/min: (a) wheel and (b) rail

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Fig. 13

SEM micrographs of longitudinal section of wheel/rail rollers in M sand and 15 g/min: (a) wheel and (b) rail

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Fig. 14

Schematic of the mechanism of sanding in improving adhesion and damage under the water condition: (a) macroschematic, (b) microschematic of asperity contact, and (c) microschematic of wheel/rail separating contact

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