Evaluation of laminated composite plates behavior under shear-after-impatc loading conditions: a methodology proposal
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da USP |
Texto Completo: | https://www.teses.usp.br/teses/disponiveis/18/18161/tde-05082021-081042/ |
Resumo: | Fiber-reinforced polymer (FRP) laminated composite materials represents the greatest revolution since the development of the jet turbine in aeronautical industry. Possessing high stiffness and strength to weight ratio, they encounter increasingly space in high-performance applications, particularly in aircrafts. However, nowadays there are limitations in their usage attached to the complexity of prediction of behavior that these materials presents under impact loadings, which can result in a significant reduction in their mechanical properties. Moreover, due to its heterogeneity and anisotropy, the description of initiation and propagation of damage and failure mechanisms are not fully understood yet. Thus, the application of composite materials in aeronautical structures still follow conservative design philosophies. In this context, it is strategic the study of the mechanical behavior and the failure development and evolution presented by these materials. Following this, the post-failure behavior comprehension, in the sense of prediction of its residual strength, it is of major relevance to use damage tolerant design philosophies when designing one structure. So, this work presents a experimental approach, computationally aided, to evaluate the shear-after (low-velocity) impact behavior of FRP composites with unidirectional (UD) reinforcement since this is a poorly explored theme by the existent literature. Based on Continuum Damage Mechanics (CDM), a material model present in the literature is employed to investigate computationally the failure and post-failure of these materials under impact an shear-after-impact loadings. Thus, experimental tests in [0º]16 specimens are conducted in a 3-rail and drop-weight tests apparatus to obtain the stress-strain curves results for laminates with and without damage. Based in these, a phenomenological damage metric for shear-after-impact is proposed to aid the obtaining of the residual strength of these materials. Computational simulations are realized aiming to obtain, using the finite element method, the tendencies experimentally observed and to evaluate the potentialities and limitations of the material model employed. It is concluded at the end of this work that the proposed methodology is promising to obtain a complementary to the already consolidated approaches of compression- and flexure-after-impact. |
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Evaluation of laminated composite plates behavior under shear-after-impatc loading conditions: a methodology proposalAvaliação do comportamento de placas laminadas de material compósito sob cisalhamento após carregamento de impactoAnálise de elementos finitosCarregamento de impactoCisalhamento pós-impactoComportamento pós-impactoCompósitos laminadosFinite element analysisImpact loadingLaminated compositesPost-impact behaviorShear-after-impactFiber-reinforced polymer (FRP) laminated composite materials represents the greatest revolution since the development of the jet turbine in aeronautical industry. Possessing high stiffness and strength to weight ratio, they encounter increasingly space in high-performance applications, particularly in aircrafts. However, nowadays there are limitations in their usage attached to the complexity of prediction of behavior that these materials presents under impact loadings, which can result in a significant reduction in their mechanical properties. Moreover, due to its heterogeneity and anisotropy, the description of initiation and propagation of damage and failure mechanisms are not fully understood yet. Thus, the application of composite materials in aeronautical structures still follow conservative design philosophies. In this context, it is strategic the study of the mechanical behavior and the failure development and evolution presented by these materials. Following this, the post-failure behavior comprehension, in the sense of prediction of its residual strength, it is of major relevance to use damage tolerant design philosophies when designing one structure. So, this work presents a experimental approach, computationally aided, to evaluate the shear-after (low-velocity) impact behavior of FRP composites with unidirectional (UD) reinforcement since this is a poorly explored theme by the existent literature. Based on Continuum Damage Mechanics (CDM), a material model present in the literature is employed to investigate computationally the failure and post-failure of these materials under impact an shear-after-impact loadings. Thus, experimental tests in [0º]16 specimens are conducted in a 3-rail and drop-weight tests apparatus to obtain the stress-strain curves results for laminates with and without damage. Based in these, a phenomenological damage metric for shear-after-impact is proposed to aid the obtaining of the residual strength of these materials. Computational simulations are realized aiming to obtain, using the finite element method, the tendencies experimentally observed and to evaluate the potentialities and limitations of the material model employed. It is concluded at the end of this work that the proposed methodology is promising to obtain a complementary to the already consolidated approaches of compression- and flexure-after-impact.Materiais compósitos laminados de matriz polimérica reforçados por fibras (MPRF) representam, na indústria aeronáutica, a maior revolução desde o advento da turbina a jato. Possuindo alta rigidez e resistência específica, estes encontram cada vez mais espaço em aplicações de alta performance e, especialmente, em aeronaves. Contudo, atualmente existem limitações em seu uso atreladas a complexidade na previsão do comportamento destes materiais sob carregamentos de impacto, o qual pode resultar em redução significativa em suas propriedades mecânicas. Além disso, devido a sua heterogeneidade e anisotropia, os mecanismos de iniciação e progressão de dano e falha não são entendidos plenamente. Desta forma, a aplicação de materiais compósitos em estruturas aeronáuticas ainda seguem filosofias de projeto conservadoras. Neste contexto, é estratégico o estudo do comportamento mecânico e do processo de falha apresentado por estes materiais. Além disso, o comportamento pós-falha, no sentido de prever sua resistência residual, é de grande importância para utilização de filosofias tolerantes ao dano ao se projetar uma dada estrutura. Assim, este trabalho apresenta uma abordagem experimental, auxiliada computacionalmente, para avaliar o comportamento de compósitos do tipo MPRF sob cisalhamento pós-impacto de baixa velocidade com reforço unidirecional tendo em vista que este é um tema pouco explorado pela literatura existente. Com base na Mecânica do Dano Contínuo, emprega-se um modelo de material da literatura afim de se investigar computacionalmente a falha e pós-falha destes materiais sob impacto e cisalhamento pós-impacto. Assim, ensaios experimentais em espécimes [0º]16 são conduzidos em um aparato de rail test (3 trilhos) e drop test a fim de se obter resultados de curvas tensão-deformação para os laminados com e sem dano. Baseado nestes, uma métrica de dano fenomenológica para cisalhamento pós-impacto é proposta para auxiliar na obtenção da resistência residual destes materiais. Simulações computacionais são realizadas afim de se obter via método dos elementos finitos as tendências observadas experimentalmente e para avaliar as potencialidades e limitações do modelo de material utilizado. Conclui-se ao término deste trabalho que a metodologia proposta é promissora para se obter um complementar as abordagens já consolidadas de compressão e flexão pós-impacto.Biblioteca Digitais de Teses e Dissertações da USPTita, VolneiSouza, Gabriel Sales Candido2021-02-26info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttps://www.teses.usp.br/teses/disponiveis/18/18161/tde-05082021-081042/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/openAccesseng2021-08-09T21:15:02Zoai:teses.usp.br:tde-05082021-081042Biblioteca 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:27212021-08-09T21:15:02Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Evaluation of laminated composite plates behavior under shear-after-impatc loading conditions: a methodology proposal Avaliação do comportamento de placas laminadas de material compósito sob cisalhamento após carregamento de impacto |
title |
Evaluation of laminated composite plates behavior under shear-after-impatc loading conditions: a methodology proposal |
spellingShingle |
Evaluation of laminated composite plates behavior under shear-after-impatc loading conditions: a methodology proposal Souza, Gabriel Sales Candido Análise de elementos finitos Carregamento de impacto Cisalhamento pós-impacto Comportamento pós-impacto Compósitos laminados Finite element analysis Impact loading Laminated composites Post-impact behavior Shear-after-impact |
title_short |
Evaluation of laminated composite plates behavior under shear-after-impatc loading conditions: a methodology proposal |
title_full |
Evaluation of laminated composite plates behavior under shear-after-impatc loading conditions: a methodology proposal |
title_fullStr |
Evaluation of laminated composite plates behavior under shear-after-impatc loading conditions: a methodology proposal |
title_full_unstemmed |
Evaluation of laminated composite plates behavior under shear-after-impatc loading conditions: a methodology proposal |
title_sort |
Evaluation of laminated composite plates behavior under shear-after-impatc loading conditions: a methodology proposal |
author |
Souza, Gabriel Sales Candido |
author_facet |
Souza, Gabriel Sales Candido |
author_role |
author |
dc.contributor.none.fl_str_mv |
Tita, Volnei |
dc.contributor.author.fl_str_mv |
Souza, Gabriel Sales Candido |
dc.subject.por.fl_str_mv |
Análise de elementos finitos Carregamento de impacto Cisalhamento pós-impacto Comportamento pós-impacto Compósitos laminados Finite element analysis Impact loading Laminated composites Post-impact behavior Shear-after-impact |
topic |
Análise de elementos finitos Carregamento de impacto Cisalhamento pós-impacto Comportamento pós-impacto Compósitos laminados Finite element analysis Impact loading Laminated composites Post-impact behavior Shear-after-impact |
description |
Fiber-reinforced polymer (FRP) laminated composite materials represents the greatest revolution since the development of the jet turbine in aeronautical industry. Possessing high stiffness and strength to weight ratio, they encounter increasingly space in high-performance applications, particularly in aircrafts. However, nowadays there are limitations in their usage attached to the complexity of prediction of behavior that these materials presents under impact loadings, which can result in a significant reduction in their mechanical properties. Moreover, due to its heterogeneity and anisotropy, the description of initiation and propagation of damage and failure mechanisms are not fully understood yet. Thus, the application of composite materials in aeronautical structures still follow conservative design philosophies. In this context, it is strategic the study of the mechanical behavior and the failure development and evolution presented by these materials. Following this, the post-failure behavior comprehension, in the sense of prediction of its residual strength, it is of major relevance to use damage tolerant design philosophies when designing one structure. So, this work presents a experimental approach, computationally aided, to evaluate the shear-after (low-velocity) impact behavior of FRP composites with unidirectional (UD) reinforcement since this is a poorly explored theme by the existent literature. Based on Continuum Damage Mechanics (CDM), a material model present in the literature is employed to investigate computationally the failure and post-failure of these materials under impact an shear-after-impact loadings. Thus, experimental tests in [0º]16 specimens are conducted in a 3-rail and drop-weight tests apparatus to obtain the stress-strain curves results for laminates with and without damage. Based in these, a phenomenological damage metric for shear-after-impact is proposed to aid the obtaining of the residual strength of these materials. Computational simulations are realized aiming to obtain, using the finite element method, the tendencies experimentally observed and to evaluate the potentialities and limitations of the material model employed. It is concluded at the end of this work that the proposed methodology is promising to obtain a complementary to the already consolidated approaches of compression- and flexure-after-impact. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-02-26 |
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 |
https://www.teses.usp.br/teses/disponiveis/18/18161/tde-05082021-081042/ |
url |
https://www.teses.usp.br/teses/disponiveis/18/18161/tde-05082021-081042/ |
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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1809090415692873728 |