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98161

TRIBOLOGICAL PROPERTIES OF POLYMERIC MATERIALS LUBRICATED BY SAND CONTAMINATED WATER

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Last updated: 25 Dec 2024

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Abstract

The aim of this work is to investigate the abrasive wear resistance of four types of polymeric materials such as polymethylmethacrylate (PMMA), polyamide (PA6), polyethylene terephthalate (PET) and polytetrafluoroethylene (PTFE). Friction and wear tests were carried out at water and salt water lubricated sliding conditions. Sand of particle size ranging from 30 to 50 µm was used as contaminant at 1.0 wt. % concentration. Tests were carried out at 150 N applied load and 0.4, 0.7 and 1.2 m/s sliding velocity for 300 seconds. The test results showed that a correlation between friction coefficient and voltage generated was found for polymers sliding against PET and against steel in water and salt water lubricated conditions.
 
The results showed that motion of sand particles trapped in the contact area may be rolling or sliding. Rolling causes lower friction and wear. Sliding occurs when sand particles are  embedded in one of the rubbing surfaces then they abrade the counterface and increase wear and friction. Hardness as well as triboelectrification of the rubbing surfaces and sand particles influence rolling and sliding. Increasing ESC will increase the adhesive force between the two rubbing surfaces, where embedment of sand or sticking is prevailing. Based on that, sand particles embed into PTFE and abrade the steel surface, while in condition of PET sliding on PET, sand tends to roll than embed in PET surface leading to drastic decrease in both friction and wear.
 
Salt water as lubricating medium of PET shaft sliding on the tested polymeric materials caused significant friction increase. The lowest friction was displayed by sliding PET on PET, while wear of polymeric materials showed significant increase in the presence of salt water. The lowest wear was experienced by PTFE. Salt water caused remarkable wear increase. This behavior can be explained on the fact that good conductivity of salt water released the generated ESC and decreased the adherence of sand on the contact surface.
 

DOI

10.21608/jest.2020.98161

Keywords

Friction, Wear, polymeric materials, sand, water, salt water

Authors

First Name

M. M.

Last Name

Mahmoud

MiddleName

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Affiliation

Department of Production engineering and Mechanical Design, Faculty of Engineering, Minia University, P. N. 61111, El-Minia, EGYPT.

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City

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Orcid

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First Name

M. K.

Last Name

Mohamed

MiddleName

-

Affiliation

Department of Production engineering and Mechanical Design, Faculty of Engineering, Minia University, P. N. 61111, El-Minia, EGYPT.

Email

-

City

-

Orcid

-

First Name

M. M.

Last Name

Youssef

MiddleName

-

Affiliation

Department of Automotive and Tractors engineering, Faculty of Engineering, Minia University, P. N. 61111, El-Minia, EGYPT.

Email

-

City

-

Orcid

-

First Name

W. Y.

Last Name

Ali

MiddleName

-

Affiliation

Department of Production engineering and Mechanical Design, Faculty of Engineering, Minia University, P. N. 61111, El-Minia, EGYPT.

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Orcid

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Volume

17

Article Issue

3

Related Issue

14861

Issue Date

2020-07-01

Receive Date

2020-04-28

Publish Date

2020-07-01

Page Start

26

Page End

36

Print ISSN

2090-5882

Online ISSN

2090-5955

Article File

JEST_Volume 17_Issue 3_Pages 26-36.pdf

PDF . 489.1kB

Link

https://jest.journals.ekb.eg/article_98161.html

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https://jest.journals.ekb.eg/service?article_code=98161

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3

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Original Article

Type Code

1,211

Publication Type

Journal

Publication Title

Journal of the Egyptian Society of Tribology

Publication Link

https://jest.journals.ekb.eg/

MainTitle

TRIBOLOGICAL PROPERTIES OF POLYMERIC MATERIALS LUBRICATED BY SAND CONTAMINATED WATER

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Type

Article

Created At

22 Jan 2023