Analysis of delamination of composite laminates through the XFEM based on the Layerwise displacement theory

Detalhes bibliográficos
Autor(a) principal: Santos, Matheus Vilar Mota
Data de Publicação: 2018
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Biblioteca Digital de Teses e Dissertações da USP
Texto Completo: http://www.teses.usp.br/teses/disponiveis/18/18148/tde-03102018-122551/
Resumo: Composite laminates are being more employed as fundamental structures due to its low weight and high stiffness. An example of this innovation is the primary structures of modern aircraft, which are lighter than the material formerly used. To predict the material response as load gradually increases can be quite demanding due to composite\'s complex failure mechanism. Hence superior computational models should be further investigated to precisely predict the mechanical behavior of composite media. This dissertation addresses an extended finite element procedure based on the layerwise displacement theory to simulate purely mode I delamination failure in composite laminates. The present model has the potential to perform structural analyzes in a pre-delaminated structure and also considering progressive failure. The type of element to be employed at the discretion of the model is the rectangular 4-node iso-parametric homogeneous element whose displacement field is approximated based in the layerwise theory. There are four types of degrees of freedom, one displacement in each direction, and one degree of freedom associated to the strong discontinuity. Numerical examples already solved in the bibliography are suggested in this dissertation, which demonstrate the potential of the model developed to accurately simulate pure mode I delamination in case of the investigation here is further elaborated. In addition, one possibility of future development of this dissertation is the modeling of fracture mode I without the need to discretize the cohesive planes as realized in traditional Cohesive Zone Methods.
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spelling Analysis of delamination of composite laminates through the XFEM based on the Layerwise displacement theoryAnálise de delaminação em compósitos laminados pelo método XFEM baseado no campo de deslocamento da teoria LayerwiseComposite laminateComposite structureCompósito laminadoDelaminaçãoDelaminationEstrutura de compósitoExtended finite element methodFalha progressivaLayerwiseLayerwiseMétodo dos elementos finitos estendidoProgressive failureXFEMXFEMXLFEMXLFEMComposite laminates are being more employed as fundamental structures due to its low weight and high stiffness. An example of this innovation is the primary structures of modern aircraft, which are lighter than the material formerly used. To predict the material response as load gradually increases can be quite demanding due to composite\'s complex failure mechanism. Hence superior computational models should be further investigated to precisely predict the mechanical behavior of composite media. This dissertation addresses an extended finite element procedure based on the layerwise displacement theory to simulate purely mode I delamination failure in composite laminates. The present model has the potential to perform structural analyzes in a pre-delaminated structure and also considering progressive failure. The type of element to be employed at the discretion of the model is the rectangular 4-node iso-parametric homogeneous element whose displacement field is approximated based in the layerwise theory. There are four types of degrees of freedom, one displacement in each direction, and one degree of freedom associated to the strong discontinuity. Numerical examples already solved in the bibliography are suggested in this dissertation, which demonstrate the potential of the model developed to accurately simulate pure mode I delamination in case of the investigation here is further elaborated. In addition, one possibility of future development of this dissertation is the modeling of fracture mode I without the need to discretize the cohesive planes as realized in traditional Cohesive Zone Methods.Compósitos laminados estão sendo mais empregados como estruturas fundamentais devido ao seu baixo peso e alta rigidez. Um exemplo dessa inovação são as estruturas primárias das aeronaves modernas, que são mais leves do que as os materiais empregados antigamente. Prever a resposta do material à medida que a carga aumenta gradualmente pode ser difícil devido ao complexo mecanismo de falha dos compósitos. Portanto, modelos computacionais mais refinados devem ser investigados a fim de se prever um comportamento mecânico mais preciso. Esta dissertação aborda um procedimento de elementos finitos estendido baseado na teoria de deslocamento layerwise para simular falhas de delaminação modo I em laminados compósitos. O modelo abordado tem potencial para realizar análises em uma estrutura prédelaminada além de falha progressiva. O tipo de elemento a ser empregado na discrição do modelo é o isoparamétrico, homogêneo de 4 nós, retangular, e o campo de deslocamento é baseado na teoria layerwise. Existem quatro tipos de graus de liberdade, um deslocamento em cada direção, e um grau de liberdade associado à forte. Sugere-se nesse trabalho, exemplos, que são comparados com a bibliografia, e que apontam que o modelo desenvolvido nesta dissertação tem o potencial de simular o fenômeno de delaminação em modo I com acurácia, caso o estudo nessa dissertação seja estendido. Além disso, uma possibilidade de desenvolvimento futuro desse trabalho é a modelagem da fratura modo I sem a necessidade de discretizar os planos coesivos entre as lâminas, como realizado em métodos coesivos tradicionais.Biblioteca Digitais de Teses e Dissertações da USPRibeiro, Marcelo LeiteSantos, Matheus Vilar Mota2018-06-18info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://www.teses.usp.br/teses/disponiveis/18/18148/tde-03102018-122551/reponame:Biblioteca Digital de Teses e Dissertações da USPinstname:Universidade de São Paulo (USP)instacron:USPLiberar o conteúdo para acesso público.info:eu-repo/semantics/openAccesseng2018-11-01T16:25:01Zoai:teses.usp.br:tde-03102018-122551Biblioteca Digital de Teses e Dissertaçõeshttp://www.teses.usp.br/PUBhttp://www.teses.usp.br/cgi-bin/mtd2br.plvirginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.bropendoar:27212018-11-01T16:25:01Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)false
dc.title.none.fl_str_mv Analysis of delamination of composite laminates through the XFEM based on the Layerwise displacement theory
Análise de delaminação em compósitos laminados pelo método XFEM baseado no campo de deslocamento da teoria Layerwise
title Analysis of delamination of composite laminates through the XFEM based on the Layerwise displacement theory
spellingShingle Analysis of delamination of composite laminates through the XFEM based on the Layerwise displacement theory
Santos, Matheus Vilar Mota
Composite laminate
Composite structure
Compósito laminado
Delaminação
Delamination
Estrutura de compósito
Extended finite element method
Falha progressiva
Layerwise
Layerwise
Método dos elementos finitos estendido
Progressive failure
XFEM
XFEM
XLFEM
XLFEM
title_short Analysis of delamination of composite laminates through the XFEM based on the Layerwise displacement theory
title_full Analysis of delamination of composite laminates through the XFEM based on the Layerwise displacement theory
title_fullStr Analysis of delamination of composite laminates through the XFEM based on the Layerwise displacement theory
title_full_unstemmed Analysis of delamination of composite laminates through the XFEM based on the Layerwise displacement theory
title_sort Analysis of delamination of composite laminates through the XFEM based on the Layerwise displacement theory
author Santos, Matheus Vilar Mota
author_facet Santos, Matheus Vilar Mota
author_role author
dc.contributor.none.fl_str_mv Ribeiro, Marcelo Leite
dc.contributor.author.fl_str_mv Santos, Matheus Vilar Mota
dc.subject.por.fl_str_mv Composite laminate
Composite structure
Compósito laminado
Delaminação
Delamination
Estrutura de compósito
Extended finite element method
Falha progressiva
Layerwise
Layerwise
Método dos elementos finitos estendido
Progressive failure
XFEM
XFEM
XLFEM
XLFEM
topic Composite laminate
Composite structure
Compósito laminado
Delaminação
Delamination
Estrutura de compósito
Extended finite element method
Falha progressiva
Layerwise
Layerwise
Método dos elementos finitos estendido
Progressive failure
XFEM
XFEM
XLFEM
XLFEM
description Composite laminates are being more employed as fundamental structures due to its low weight and high stiffness. An example of this innovation is the primary structures of modern aircraft, which are lighter than the material formerly used. To predict the material response as load gradually increases can be quite demanding due to composite\'s complex failure mechanism. Hence superior computational models should be further investigated to precisely predict the mechanical behavior of composite media. This dissertation addresses an extended finite element procedure based on the layerwise displacement theory to simulate purely mode I delamination failure in composite laminates. The present model has the potential to perform structural analyzes in a pre-delaminated structure and also considering progressive failure. The type of element to be employed at the discretion of the model is the rectangular 4-node iso-parametric homogeneous element whose displacement field is approximated based in the layerwise theory. There are four types of degrees of freedom, one displacement in each direction, and one degree of freedom associated to the strong discontinuity. Numerical examples already solved in the bibliography are suggested in this dissertation, which demonstrate the potential of the model developed to accurately simulate pure mode I delamination in case of the investigation here is further elaborated. In addition, one possibility of future development of this dissertation is the modeling of fracture mode I without the need to discretize the cohesive planes as realized in traditional Cohesive Zone Methods.
publishDate 2018
dc.date.none.fl_str_mv 2018-06-18
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.teses.usp.br/teses/disponiveis/18/18148/tde-03102018-122551/
url http://www.teses.usp.br/teses/disponiveis/18/18148/tde-03102018-122551/
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv
dc.rights.driver.fl_str_mv Liberar o conteúdo para acesso público.
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Liberar o conteúdo para acesso público.
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.coverage.none.fl_str_mv
dc.publisher.none.fl_str_mv Biblioteca Digitais de Teses e Dissertações da USP
publisher.none.fl_str_mv Biblioteca Digitais de Teses e Dissertações da USP
dc.source.none.fl_str_mv
reponame:Biblioteca Digital de Teses e Dissertações da USP
instname:Universidade de São Paulo (USP)
instacron:USP
instname_str Universidade de São Paulo (USP)
instacron_str USP
institution USP
reponame_str Biblioteca Digital de Teses e Dissertações da USP
collection Biblioteca Digital de Teses e Dissertações da USP
repository.name.fl_str_mv Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)
repository.mail.fl_str_mv virginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.br
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