Strain gradient plasticity-based modeling of damage and fracture

Tesis con mención internacional

Detalles Bibliográficos
Autor: Martínez Pañeda, Emilio|||0000-0002-1562-097X
Tipo de recurso: tesis doctoral
Fecha de publicación:2016
País:España
Institución:Universidad de Oviedo (UNIOVI)
Repositorio:RUO. Repositorio Institucional de la Universidad de Oviedo
Idioma:inglés
OAI Identifier:oai:digibuo.uniovi.es:10651/38977
Acceso en línea:http://hdl.handle.net/10651/38977
Access Level:acceso abierto
Palabra clave:Diseño, construcción y fabricación de la ingeniería mecánica
Plasticidad
Mecánica de medios continuos
Mecánica de sólidos
Hidrógeno
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spelling Strain gradient plasticity-based modeling of damage and fractureInfluencia de las teorías de gradientes de deformación plástica en los modelos de daño y fracturaMartínez Pañeda, Emilio|||0000-0002-1562-097XDiseño, construcción y fabricación de la ingeniería mecánicaPlasticidadMecánica de medios continuosMecánica de sólidosHidrógenoTesis con mención internacionalExperiments have consistently shown that metallic materials display strong size effects at the micron scale, with smaller being harder. As a result, a significant body of research has been devoted to model this size dependent plastic phenomena. At the continuum level, phenomenological strain gradient plasticity (SGP) formulations have been developed to extend plasticity theory to small scales. Grounded on the physical notion of geometrically necessary dislocations (GNDs, associated with non-uniform plastic deformation), SGP theories relate the plastic work to both strains and strain gradients, introducing a length scale in the constitutive equations. While growing interest in micro-technology motivated at first the development of SGP models, the influence of GNDs goes beyond micron-scale applications, as strains vary over microns in a wide range of engineering designs. Particularly, gradient-enhanced modeling of fracture and damage appears imperative - independently of the size of the specimen - as the plastic zone adjacent to the crack tip is physically small and contains strong spatial gradients of deformation. In this work a general framework for damage and fracture assessment accounting for the role of GNDs is provided. Different classes of gradient plasticity theories with ad hoc novel numerical schemes are employed. Emphasis is given to develop robust computational tools to predict and understand material failure mechanisms. Results show a very strong influence of GNDs, revealing the need to incorporate gradient effects to adequately characterize behavior at the small scales involved in crack tip deformation. Encouraging quantitative agreement with experimental data is achieved by incorporating features of the underlying microstructure (GNDs). The richer continuum characterization of stress and hydrogen concentration in the fracture process zone leads to particularly promising results in hydrogen environmental assisted cracking modeling, a field of great engineering interest that continues to plague applications of high strength metals.Betegón Biempica, María CovadongaConstrucción e Ingeniería de Fabricación, Departamento de20162016-06-03doctoral thesishttp://purl.org/coar/resource_type/c_db06NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/doctoralThesishttp://hdl.handle.net/10651/38977reponame:RUO. Repositorio Institucional de la Universidad de Oviedoinstname:Universidad de Oviedo (UNIOVI)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:digibuo.uniovi.es:10651/389772026-06-07T06:38:51Z
dc.title.none.fl_str_mv Strain gradient plasticity-based modeling of damage and fracture
Influencia de las teorías de gradientes de deformación plástica en los modelos de daño y fractura
title Strain gradient plasticity-based modeling of damage and fracture
spellingShingle Strain gradient plasticity-based modeling of damage and fracture
Martínez Pañeda, Emilio|||0000-0002-1562-097X
Diseño, construcción y fabricación de la ingeniería mecánica
Plasticidad
Mecánica de medios continuos
Mecánica de sólidos
Hidrógeno
title_short Strain gradient plasticity-based modeling of damage and fracture
title_full Strain gradient plasticity-based modeling of damage and fracture
title_fullStr Strain gradient plasticity-based modeling of damage and fracture
title_full_unstemmed Strain gradient plasticity-based modeling of damage and fracture
title_sort Strain gradient plasticity-based modeling of damage and fracture
dc.creator.none.fl_str_mv Martínez Pañeda, Emilio|||0000-0002-1562-097X
author Martínez Pañeda, Emilio|||0000-0002-1562-097X
author_facet Martínez Pañeda, Emilio|||0000-0002-1562-097X
author_role author
dc.contributor.none.fl_str_mv Betegón Biempica, María Covadonga
Construcción e Ingeniería de Fabricación, Departamento de
dc.subject.none.fl_str_mv Diseño, construcción y fabricación de la ingeniería mecánica
Plasticidad
Mecánica de medios continuos
Mecánica de sólidos
Hidrógeno
topic Diseño, construcción y fabricación de la ingeniería mecánica
Plasticidad
Mecánica de medios continuos
Mecánica de sólidos
Hidrógeno
description Tesis con mención internacional
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-06-03
dc.type.none.fl_str_mv doctoral thesis
http://purl.org/coar/resource_type/c_db06
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
dc.identifier.none.fl_str_mv http://hdl.handle.net/10651/38977
url http://hdl.handle.net/10651/38977
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivatives 4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:RUO. Repositorio Institucional de la Universidad de Oviedo
instname:Universidad de Oviedo (UNIOVI)
instname_str Universidad de Oviedo (UNIOVI)
reponame_str RUO. Repositorio Institucional de la Universidad de Oviedo
collection RUO. Repositorio Institucional de la Universidad de Oviedo
repository.name.fl_str_mv
repository.mail.fl_str_mv
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