Fractal analysis of fracture surface of Duplex Stainless steel UNS S31803

Detalhes bibliográficos
Autor(a) principal: Eloy de Macedo Silva
Data de Publicação: 2002
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFC
Texto Completo: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7306
Resumo: In the last years, the fractal geometry has become widely studied. Its application in several areas increased substantially, particularly in materials engineering and science, aiming the analysis of failures and the study of the mechanical properties of materials. Some studies have shown the relationship between the fracture surfaces and their mechanical properties using the fractal geometry and its properties of fractal dimension and selfsimilarity. In this research, the fracture surface of duplex stainless steel, which was obtained by the Charpy impact test, was studied applying the fractal geometry. Considering the 475ÂC embrittlement, the steel was submitted to thermal aging to obtain the fracture surfaces, whose images were captured by the scanning electron microscope (SEM). In the fractal analysis, a study was made applying the island method and profile analysis through the digitalization of the images and the application of image analyzing software. Emphasis was given on the calculation of the fractal dimension (FD) of the surface, on the energy absorbed during the impact test, on the involved fracture mechanisms and as well on the relationship between FD and thermal aging. In order to better understanding the subject, it was done the review about fracture mechanics, of duplex stainless steel and of fractal geometry. Finishing the research, the obtained fracture surface, the absorbed energy and the obtained values of FD were analyzed. The obtained results demonstrated a relationship between the fractal dimension, the size of the dimples in fracture surfaces and the impact energy to obtain them.
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spelling info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisFractal analysis of fracture surface of Duplex Stainless steel UNS S31803AnÃlise da superfÃcie de fratura do aÃo inoxidÃvel duplex UNS S31803 atravÃs da aplicaÃÃo da geometria dos fractais2002-10-18Ãnio Pontes de Deus24220396349Telmo Roberto Strohaecker23896264087http://lattes.cnpq.br/2881014239950754 Josà Mauricio Oliveira Matos05791375387http://lattes.cnpq.br/4844637529398475 24130990349http://lattes.cnpq.br/1232790845162905 Eloy de Macedo SilvaUniversidade Federal do CearÃPrograma de PÃs-GraduaÃÃo em Engenharia e CiÃncia de MateriaisUFCBRAÃo InoxidÃvel CiÃncia de materiais DegradaÃÃo de materiais Processos de transformaÃÃoDuplex Stainless Steel UNS S 31803, Fractal, Fracture SurfaceENGENHARIA DE MATERIAIS E METALURGICAIn the last years, the fractal geometry has become widely studied. Its application in several areas increased substantially, particularly in materials engineering and science, aiming the analysis of failures and the study of the mechanical properties of materials. Some studies have shown the relationship between the fracture surfaces and their mechanical properties using the fractal geometry and its properties of fractal dimension and selfsimilarity. In this research, the fracture surface of duplex stainless steel, which was obtained by the Charpy impact test, was studied applying the fractal geometry. Considering the 475ÂC embrittlement, the steel was submitted to thermal aging to obtain the fracture surfaces, whose images were captured by the scanning electron microscope (SEM). In the fractal analysis, a study was made applying the island method and profile analysis through the digitalization of the images and the application of image analyzing software. Emphasis was given on the calculation of the fractal dimension (FD) of the surface, on the energy absorbed during the impact test, on the involved fracture mechanisms and as well on the relationship between FD and thermal aging. In order to better understanding the subject, it was done the review about fracture mechanics, of duplex stainless steel and of fractal geometry. Finishing the research, the obtained fracture surface, the absorbed energy and the obtained values of FD were analyzed. The obtained results demonstrated a relationship between the fractal dimension, the size of the dimples in fracture surfaces and the impact energy to obtain them. A geometria dos fractais nos Ãltimos anos tem se tornado bastante difundida no meio cientÃfico. O seu emprego em diversas Ãreas aumentou substancialmente, em particular na engenharia e ciÃncia dos materiais, com o objetivo de analisar falhas e estudar as propriedades mecÃnicas dos materiais. Alguns estudos tÃm mostrado a relaÃÃo entre as propriedades mecÃnicas de superfÃcies de fratura com a geometria dos fractais e suas propriedades de dimensÃo fractal e auto-similaridade. Nesta pesquisa, foi estudada, com base na geometria dos fractais, a superfÃcie de fratura do aÃo inoxidÃvel duplex obtida atravÃs do ensaio de impacto Charpy. Considerando a fragilizaÃÃo a 475C, o aÃo foi submetido ao tratamento tÃrmico de envelhecimento para a obtenÃÃo das superfÃcies de fraturas cujas imagens foram captadas no microscÃpio eletrÃnico de varredura (MEV). Na anÃlise fractal foi feito um estudo aplicando os mÃtodos das ilhas e anÃlise de perfil atravÃs da digitalizaÃÃo das imagens e aplicaÃÃo de softwares de anÃlise de imagem. Foi dada Ãnfase na anÃlise do cÃlculo da dimensÃo fractal (Df) da superfÃcie, na energia absorvida no ensaio de impacto, nos mecanismos de fratura envolvidos, bem como na relaÃÃo entre Df e o tratamento tÃrmico de envelhecimento. Para o melhor entendimento do trabalho foi feita uma revisÃo bibliogrÃfica sobre a mecÃnica da fratura, o aÃo inoxidÃvel duplex e a geometria dos fractais. Para finalizar a pesquisa, foi feita a anÃlise da superfÃcie da fratura obtida, da energia absorvia e de valores de Df alcanÃados. Os resultados obtidos demonstraram uma relaÃÃo entre a dimensÃo fractal, o tamanho dos dimples em superfÃcies de fratura e a energia de impacto para a obtenÃÃo das mesmas. CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superiorhttp://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7306application/pdfinfo:eu-repo/semantics/openAccessporreponame:Biblioteca Digital de Teses e Dissertações da UFCinstname:Universidade Federal do Cearáinstacron:UFC2019-01-21T11:20:19Zmail@mail.com -
dc.title.en.fl_str_mv Fractal analysis of fracture surface of Duplex Stainless steel UNS S31803
dc.title.alternative.pt.fl_str_mv AnÃlise da superfÃcie de fratura do aÃo inoxidÃvel duplex UNS S31803 atravÃs da aplicaÃÃo da geometria dos fractais
title Fractal analysis of fracture surface of Duplex Stainless steel UNS S31803
spellingShingle Fractal analysis of fracture surface of Duplex Stainless steel UNS S31803
Eloy de Macedo Silva
AÃo InoxidÃvel
CiÃncia de materiais
DegradaÃÃo de materiais
Processos de transformaÃÃo
Duplex Stainless Steel UNS S 31803, Fractal, Fracture Surface
ENGENHARIA DE MATERIAIS E METALURGICA
title_short Fractal analysis of fracture surface of Duplex Stainless steel UNS S31803
title_full Fractal analysis of fracture surface of Duplex Stainless steel UNS S31803
title_fullStr Fractal analysis of fracture surface of Duplex Stainless steel UNS S31803
title_full_unstemmed Fractal analysis of fracture surface of Duplex Stainless steel UNS S31803
title_sort Fractal analysis of fracture surface of Duplex Stainless steel UNS S31803
author Eloy de Macedo Silva
author_facet Eloy de Macedo Silva
author_role author
dc.contributor.advisor1.fl_str_mv Ãnio Pontes de Deus
dc.contributor.advisor1ID.fl_str_mv 24220396349
dc.contributor.referee1.fl_str_mv Telmo Roberto Strohaecker
dc.contributor.referee1ID.fl_str_mv 23896264087
dc.contributor.referee1Lattes.fl_str_mv http://lattes.cnpq.br/2881014239950754
dc.contributor.referee2.fl_str_mv Josà Mauricio Oliveira Matos
dc.contributor.referee2ID.fl_str_mv 05791375387
dc.contributor.referee2Lattes.fl_str_mv http://lattes.cnpq.br/4844637529398475
dc.contributor.authorID.fl_str_mv 24130990349
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/1232790845162905
dc.contributor.author.fl_str_mv Eloy de Macedo Silva
contributor_str_mv Ãnio Pontes de Deus
Telmo Roberto Strohaecker
Josà Mauricio Oliveira Matos
dc.subject.por.fl_str_mv AÃo InoxidÃvel
CiÃncia de materiais
DegradaÃÃo de materiais
Processos de transformaÃÃo
topic AÃo InoxidÃvel
CiÃncia de materiais
DegradaÃÃo de materiais
Processos de transformaÃÃo
Duplex Stainless Steel UNS S 31803, Fractal, Fracture Surface
ENGENHARIA DE MATERIAIS E METALURGICA
dc.subject.eng.fl_str_mv Duplex Stainless Steel UNS S 31803, Fractal, Fracture Surface
dc.subject.cnpq.fl_str_mv ENGENHARIA DE MATERIAIS E METALURGICA
dc.description.sponsorship.fl_txt_mv CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior
dc.description.abstract.por.fl_txt_mv In the last years, the fractal geometry has become widely studied. Its application in several areas increased substantially, particularly in materials engineering and science, aiming the analysis of failures and the study of the mechanical properties of materials. Some studies have shown the relationship between the fracture surfaces and their mechanical properties using the fractal geometry and its properties of fractal dimension and selfsimilarity. In this research, the fracture surface of duplex stainless steel, which was obtained by the Charpy impact test, was studied applying the fractal geometry. Considering the 475ÂC embrittlement, the steel was submitted to thermal aging to obtain the fracture surfaces, whose images were captured by the scanning electron microscope (SEM). In the fractal analysis, a study was made applying the island method and profile analysis through the digitalization of the images and the application of image analyzing software. Emphasis was given on the calculation of the fractal dimension (FD) of the surface, on the energy absorbed during the impact test, on the involved fracture mechanisms and as well on the relationship between FD and thermal aging. In order to better understanding the subject, it was done the review about fracture mechanics, of duplex stainless steel and of fractal geometry. Finishing the research, the obtained fracture surface, the absorbed energy and the obtained values of FD were analyzed. The obtained results demonstrated a relationship between the fractal dimension, the size of the dimples in fracture surfaces and the impact energy to obtain them.
A geometria dos fractais nos Ãltimos anos tem se tornado bastante difundida no meio cientÃfico. O seu emprego em diversas Ãreas aumentou substancialmente, em particular na engenharia e ciÃncia dos materiais, com o objetivo de analisar falhas e estudar as propriedades mecÃnicas dos materiais. Alguns estudos tÃm mostrado a relaÃÃo entre as propriedades mecÃnicas de superfÃcies de fratura com a geometria dos fractais e suas propriedades de dimensÃo fractal e auto-similaridade. Nesta pesquisa, foi estudada, com base na geometria dos fractais, a superfÃcie de fratura do aÃo inoxidÃvel duplex obtida atravÃs do ensaio de impacto Charpy. Considerando a fragilizaÃÃo a 475C, o aÃo foi submetido ao tratamento tÃrmico de envelhecimento para a obtenÃÃo das superfÃcies de fraturas cujas imagens foram captadas no microscÃpio eletrÃnico de varredura (MEV). Na anÃlise fractal foi feito um estudo aplicando os mÃtodos das ilhas e anÃlise de perfil atravÃs da digitalizaÃÃo das imagens e aplicaÃÃo de softwares de anÃlise de imagem. Foi dada Ãnfase na anÃlise do cÃlculo da dimensÃo fractal (Df) da superfÃcie, na energia absorvida no ensaio de impacto, nos mecanismos de fratura envolvidos, bem como na relaÃÃo entre Df e o tratamento tÃrmico de envelhecimento. Para o melhor entendimento do trabalho foi feita uma revisÃo bibliogrÃfica sobre a mecÃnica da fratura, o aÃo inoxidÃvel duplex e a geometria dos fractais. Para finalizar a pesquisa, foi feita a anÃlise da superfÃcie da fratura obtida, da energia absorvia e de valores de Df alcanÃados. Os resultados obtidos demonstraram uma relaÃÃo entre a dimensÃo fractal, o tamanho dos dimples em superfÃcies de fratura e a energia de impacto para a obtenÃÃo das mesmas.
description In the last years, the fractal geometry has become widely studied. Its application in several areas increased substantially, particularly in materials engineering and science, aiming the analysis of failures and the study of the mechanical properties of materials. Some studies have shown the relationship between the fracture surfaces and their mechanical properties using the fractal geometry and its properties of fractal dimension and selfsimilarity. In this research, the fracture surface of duplex stainless steel, which was obtained by the Charpy impact test, was studied applying the fractal geometry. Considering the 475ÂC embrittlement, the steel was submitted to thermal aging to obtain the fracture surfaces, whose images were captured by the scanning electron microscope (SEM). In the fractal analysis, a study was made applying the island method and profile analysis through the digitalization of the images and the application of image analyzing software. Emphasis was given on the calculation of the fractal dimension (FD) of the surface, on the energy absorbed during the impact test, on the involved fracture mechanisms and as well on the relationship between FD and thermal aging. In order to better understanding the subject, it was done the review about fracture mechanics, of duplex stainless steel and of fractal geometry. Finishing the research, the obtained fracture surface, the absorbed energy and the obtained values of FD were analyzed. The obtained results demonstrated a relationship between the fractal dimension, the size of the dimples in fracture surfaces and the impact energy to obtain them.
publishDate 2002
dc.date.issued.fl_str_mv 2002-10-18
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
status_str publishedVersion
format masterThesis
dc.identifier.uri.fl_str_mv http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7306
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dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal do CearÃ
dc.publisher.program.fl_str_mv Programa de PÃs-GraduaÃÃo em Engenharia e CiÃncia de Materiais
dc.publisher.initials.fl_str_mv UFC
dc.publisher.country.fl_str_mv BR
publisher.none.fl_str_mv Universidade Federal do CearÃ
dc.source.none.fl_str_mv reponame:Biblioteca Digital de Teses e Dissertações da UFC
instname:Universidade Federal do Ceará
instacron:UFC
reponame_str Biblioteca Digital de Teses e Dissertações da UFC
collection Biblioteca Digital de Teses e Dissertações da UFC
instname_str Universidade Federal do Ceará
instacron_str UFC
institution UFC
repository.name.fl_str_mv -
repository.mail.fl_str_mv mail@mail.com
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