dc.contributor	Sedlář Milan, RNDr. CSc. : 65631
dc.contributor.advisor	Müller Miloš, Ing. Ph.D. : 55450
dc.contributor.author	Sai, Rhoda Ayorkor
dc.date.accessioned	2021-02-04T18:39:42Z
dc.date.available	2021-02-04T18:39:42Z
dc.date.committed	2021-4-30
dc.date.defense	2020-06-25
dc.date.submitted	2019-11-1
dc.date.updated	2020-6-25
dc.degree.level	Ing.
dc.description.abstract	In this study, the effect of laser shock peening treatment on the cavitation erosion resistance of a stainless-steel type used in pump blades was characterized. The goal of the study was to compare and define the better process parameters of the treatment effective in improving the cavitation erosion resistance of the stainless-steel type. An experimental investigation was conducted using the vibratory apparatus with compliance to ASTM G32 standards. Specimens made of stainless steel 304 were treated using different laser pulse density, and beam size with a 50% overlap. Prior to the cavitation erosion test, the incubation time of the samples was estimated from previous tests of similar samples. Each sample was subjected to ultrasonic pressure pulses at different exposure times using a constant amplitude. mass loss was recorded for eachThe incubation period was used to characterize the materials impact resistance and the cavitation erosion resistance was achieved using mass loss tests and represented as the reciprocal of the cumulative volume loss rates. The mean depth of penetration was calculated from volume loss and affirmed using the cavitation erosion profile, measured with contact profilometer. The effect of exposure time on the mean depth was analyzed and found to stabilize after significant exposure time. The mean eroded depth was also compared to the compressive residual stress induced during the laser treatment and used quantitatively to describe the cavitation damage of SS304. The correlation between the cavitation erosion resistance and properties of the improved samples was perused. The variation of the cumulative volume loss with exposure time indicated improvement of the materials cavitation erosion resistance. The results of the study hawed that SS304 treated with higher power density depicted the highest erosion resistance whiles SS304 with lower power density showed the highest impact resistance during the incubation period. The summary of the results in the conclusion explains the outcome of the investigation.	cs
dc.description.abstract	In this study, the effect of laser shock peening treatment on the cavitation erosion resistance of a stainless-steel type used in pump blades was characterized. The goal of the study was to compare and define the better process parameters of the treatment effective in improving the cavitation erosion resistance of the stainless-steel type. An experimental investigation was conducted using the vibratory apparatus with compliance to ASTM G32 standards. Specimens made of stainless steel 304 were treated using different laser pulse density, and beam size with a 50% overlap. Prior to the cavitation erosion test, the incubation time of the samples was estimated from previous tests of similar samples. Each sample was subjected to ultrasonic pressure pulses at different exposure times using a constant amplitude. mass loss was recorded for eachThe incubation period was used to characterize the materials impact resistance and the cavitation erosion resistance was achieved using mass loss tests and represented as the reciprocal of the cumulative volume loss rates. The mean depth of penetration was calculated from volume loss and affirmed using the cavitation erosion profile, measured with contact profilometer. The effect of exposure time on the mean depth was analyzed and found to stabilize after significant exposure time. The mean eroded depth was also compared to the compressive residual stress induced during the laser treatment and used quantitatively to describe the cavitation damage of SS304. The correlation between the cavitation erosion resistance and properties of the improved samples was perused. The variation of the cumulative volume loss with exposure time indicated improvement of the materials cavitation erosion resistance. The results of the study hawed that SS304 treated with higher power density depicted the highest erosion resistance whiles SS304 with lower power density showed the highest impact resistance during the incubation period. The summary of the results in the conclusion explains the outcome of the investigation.	en
dc.description.mark
dc.format	100
dc.format.extent	Ilustrace, Grafy, Tabulky No
dc.identifier.signature	V 202102452
dc.identifier.uri	https://dspace.tul.cz/handle/15240/159720
dc.language.iso	an
dc.relation.isbasedon	beginenumerate itemKIM, Ki-Han, Georges CHAHINE, Jean-Pierre FRANC a Ayat KARIMI. Advanced experimental and numerical techniques for cavitation erosion prediction. Dordrecht: Springer, [2014]. Fluid mechanics and its applications, v. 106. itemFRANC, Jean-Pierre a Jean-Marie MICHEL. Fundamentals of cavitation. Boston: Kluwer Academic Publishers, c2004. ISBN 1402022328. itemBRENNEN, Christopher E. Cavitation and bubble dynamics. New York: Cambridge University Press, c2014. ISBN 978-1-107-64476-2. itemTAKATA, Tomoki, Manabu ENOKI, Pornthep CHIVAVIBUL, Akinori MATSUI a Yuji KOBAYASHI. Effect of Confinement Layer on Laser Ablation and Cavitation Bubble During Laser Shock Peening. MATERIALS TRANSACTIONS. 2016, 57(10), 1776-1783. itemSOYAMA, Hitoshi. Key Factors and Applications of Cavitation Peening. Int. Journ. of Peening Science and Technology. 2018, 1(1), 3-60. endenumerate
dc.rights	Vysokoškolská závěrečná práce je autorské dílo chráněné dle zákona č. 121/2000 Sb., autorský zákon, ve znění pozdějších předpisů. Je možné pořizovat z něj na své náklady a pro svoji osobní potřebu výpisy, opisy a rozmnoženiny. Jeho využití musí být v souladu s autorským zákonem https://www.mkcr.cz/assets/autorske-pravo/01-3982006.pdf a citační etikou https://knihovna.tul.cz/document/26	cs
dc.rights	A university thesis is a work protected by the Copyright Act. Extracts, copies and transcripts of the thesis are allowed for personal use only and at one?s own expense. The use of thesis should be in compliance with the Copyright Act. https://www.mkcr.cz/assets/autorske-pravo/01-3982006.pdf and the citation ethics https://knihovna.tul.cz/document/26	en
dc.rights.uri	https://knihovna.tul.cz/document/26
dc.rights.uri	https://www.mkcr.cz/assets/autorske-pravo/01-3982006.pdf
dc.subject	cavitation	cs
dc.subject	laser shock peening	cs
dc.subject	residual stress	cs
dc.subject	volume loss	cs
dc.subject	cavitation resistance	cs
dc.subject	cavitation	en
dc.subject	laser shock peening	en
dc.subject	residual stress	en
dc.subject	volume loss	en
dc.subject	cavitation resistance	en
dc.title	The Improvement of the Cavitation Resistance of Technical Surfaces Using High Power Laser Pulses	cs
dc.title	The improvement of the cavitation resistance of technical surfaces using high power laser pulses	en
dc.type	diplomová práce	cs
local.degree.abbreviation	Navazující
local.degree.discipline	KSA
local.degree.programme	Mechanical Engineering
local.degree.programmeabbreviation	N2301
local.department.abbreviation	KEZ
local.faculty	Fakulta strojní	cs
local.faculty.abbreviation	FS
local.identifier.author	S18000382
local.identifier.stag	40661
local.identifier.verbis
local.identifier.verbis	kpw06
local.note.administrators	automat
local.note.secrecy	Povoleno ZverejnitPraci Povoleno ZverejnitPosudky
local.poradovecislo	2452

The Improvement of the Cavitation Resistance of Technical Surfaces Using High Power Laser Pulses

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