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Research Papers: Tribochemistry and Tribofilms

Characterization of Cavitation Eroded Surfaces at Different Temperatures Using Wavelet Method

[+] Author and Article Information
A. Abouel-Kasem

Mechanical Engineering Department,
Faculty of Engineering,
King Abdulaziz University,
344 Rabigh 21911, Kingdom of Saudi Arabia
e-mail: aaahmed2@kau.edu.sa

B. Saleh

Mechanical Engineering Department,
Faculty of Engineering,
Taif University,
Taif 21944, Kingdom of Saudi Arabia;
Mechanical Engineering Department,
Faculty of Engineering,
Assiut University,
Assiut 71516, Egypt
e-mail: bahaa_saleh69@yahoo.com

K. M. Emara

Mechanical Engineering Department,
Faculty of Engineering,
Assiut University,
Assiut 71516, Egypt
e-mail: k.emara45@yahoo.com

S. M. Ahmed

Faculty of Engineering,
Mechanical Engineering Department,
Assiut University,
Assiut 71516, Egypt
e-mail: shemy2007@yahoo.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received March 14, 2016; final manuscript received July 20, 2016; published online November 30, 2016. Assoc. Editor: Robert Wood.

J. Tribol 139(3), 032301 (Nov 30, 2016) (6 pages) Paper No: TRIB-16-1086; doi: 10.1115/1.4034381 History: Received March 14, 2016; Revised July 20, 2016

In the present work, the image features of cavitation erosion surfaces at different temperatures are extracted using wavelet decomposition transform. The results obtained indicate that the extract parameters, wavelet energy, and entropy can characterize the cavitation intensity in a similar manner to that of the mass loss and average particle size at different temperatures. Based on the analysis of the eroded surface and particle morphologies for different temperatures, it was found that the predominant failure mode was fatigue.

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Figures

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Fig. 1

Schematic view of the test apparatus

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Fig. 2

SEM micrographs of the eroded surfaces after subjecting to cavitation for 2 mins at different temperatures

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Fig. 3

Mass loss of stationary-Al 99.92 specimens as function of temperature at time 2 mins

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Fig. 4

SEM of particle removed for Al-99.92 at different temperatures and at test time 2 mins

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Fig. 5

Variation of the average particle size with temperature at test time 2 mins [11]

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Fig. 6

Variation of Shannon entropies with temperature of images for eroded surface cavitated at test time of 2 mins and 750 magnification

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Fig. 7

Variation of energy with temperature of images for eroded surface cavitated at test time of 2 mins and 750 magnification

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