dc.contributor	Sedlář Milan, RNDr. CSc. : 65631
dc.contributor.advisor	Müller Miloš, Ing. Ph.D. : 55450
dc.contributor.author	Aidoo, Edmund Ofei
dc.contributor.author	S16000271
dc.date.accessioned	2019-05-09T17:00:07Z
dc.date.available	2019-05-09T17:00:07Z
dc.date.committed	2019-8-1
dc.date.defense	2018-6-14
dc.date.submitted	2018-2-1
dc.date.updated	2018-12-10
dc.degree.level	Ing.
dc.description.abstract	Research on cavitation bubble-wall interaction and its impact on material properties has been discussed. The experiment was designed and realized with pitting test carried out during the incubation period on an aluminum alloy in a modified vibratory cavitation device. The amplitude of the device was kept at constant maximum and the polished surface of the sample was exposed to cavitation pressure pulses. The test was conducted at three different exposure times to ascertain the effect of exposure time on pit formation. The surface was analyzed using a Scanning Electron Microscope and a contact profilometer. The selection of appropriate cutoff depth for the analysis of the pits was discussed as well as the correction of the signal from the surface profile. These techniques allowed us to characterize the parameters of the pits such as diameter, depth, volume and pit numbers. The frequency distribution of the pit diameters was analyzed for both the SEM images and the surface profile of the profilometer. The effect of the exposure time on the distribution of pits was analyzed. It was determined that the exposure time significantly affects the number of pits formed as well as the distribution of pit diameters. The relationship between pit volume and diameter was analyzed. The distribution of pit volumes by pitting rate for different exposure times were also discussed. The surface deformation (pit depth) is seen to increase with increasing impact forces. The jet diameter, however, does not determine the extent of deformation since this phenomenon depends on other variables such as material properties, test conditions, and the magnitude of the impact force. The discussion given at the end attempts to explain the observations made in the study.	cs
dc.description.abstract	Research on cavitation bubble-wall interaction and its impact on material properties has been discussed. The experiment was designed and realized with pitting test carried out during the incubation period on an aluminum alloy in a modified vibratory cavitation device. The amplitude of the device was kept at constant maximum and the polished surface of the sample was exposed to cavitation pressure pulses. The test was conducted at three different exposure times to ascertain the effect of exposure time on pit formation. The surface was analyzed using a Scanning Electron Microscope and a contact profilometer. The selection of appropriate cutoff depth for the analysis of the pits was discussed as well as the correction of the signal from the surface profile. These techniques allowed us to characterize the parameters of the pits such as diameter, depth, volume and pit numbers. The frequency distribution of the pit diameters was analyzed for both the SEM images and the surface profile of the profilometer. The effect of the exposure time on the distribution of pits was analyzed. It was determined that the exposure time significantly affects the number of pits formed as well as the distribution of pit diameters. The relationship between pit volume and diameter was analyzed. The distribution of pit volumes by pitting rate for different exposure times were also discussed. The surface deformation (pit depth) is seen to increase with increasing impact forces. The jet diameter, however, does not determine the extent of deformation since this phenomenon depends on other variables such as material properties, test conditions, and the magnitude of the impact force. The discussion given at the end attempts to explain the observations made in the study.	en
dc.description.mark
dc.format	70
dc.format.extent	Ilustrace, Grafy, Tabulky ROMs
dc.identifier.signature	V 201900386
dc.identifier.uri	https://dspace.tul.cz/handle/15240/152175
dc.language.iso	an
dc.relation.isbasedon	matsymblbrack1matsymbrbrack tpKim, K.-H., Chahine, G., Franc, J.-P., Karimi, A. (Eds.), Advanced experimental and numerical techniques for cavitation erosion prediction. tpNew York, Springer, 2013. ISBN 9789401785389.
dc.relation.isbasedon	vsp5mm matsymblbrack2matsymbrbrack tpFRANC, Jean-Pierre. a Jean-Marie MICHEL, Fundamentals of cavitation. tp Boston: Kluwer Academic Publishers, c2004. ISBN 1402022328.
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	Piting rate	cs
dc.subject	Exposure time	cs
dc.subject	Material response	cs
dc.subject	Cavitation	en
dc.subject	Piting rate	en
dc.subject	Exposure time	en
dc.subject	Material response	en
dc.subject.verbis	cavitation	en
dc.title	Material response on the cavitation bubble collapses	cs
dc.title	Material response on the cavitation bubble collapses	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.stag	37928
local.identifier.verbis	kpw06576178
local.note.administrators	automat
local.poradovecislo	386
local.verbis.aktualizace	2019-10-05 07:26:50	cs
local.verbis.studijniprogram	KEZ Mechanical engineering/Machines and equipment design	cs

Material response on the cavitation bubble collapses

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