Out-of-plane constraint loss in three point bend specimens with notches

ABSTRACT: This paper presents an experimental and numerical study of the effect of specimen thickness on the effective notch toughness for cleavage fracture measured using Single Edge Notch Bend (SENB) specimens containing a U-notch instead of a fatigue pre-crack. These specimens are typically used...

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Autores: Horn, A.J., Cicero González, Sergio|||0000-0002-3950-6071, Andrés Álvarez, David
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/20690
Acceso en línea:http://hdl.handle.net/10902/20690
Access Level:acceso abierto
Palabra clave:Blunt notch
Effective fracture toughness
Notch Failure Assessment Diagram
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spelling Out-of-plane constraint loss in three point bend specimens with notchesHorn, A.J.Cicero González, Sergio|||0000-0002-3950-6071Andrés Álvarez, DavidBlunt notchEffective fracture toughnessNotch Failure Assessment DiagramABSTRACT: This paper presents an experimental and numerical study of the effect of specimen thickness on the effective notch toughness for cleavage fracture measured using Single Edge Notch Bend (SENB) specimens containing a U-notch instead of a fatigue pre-crack. These specimens are typically used to measure a material's effective notch toughness and to assess failure of a structure containing a non-sharp defect using the Notch Failure Assessment Diagram (NFAD). Both the experimental data and the Finite Element (FE) failure predictions show a significant influence of specimen thickness on , over and above the microstructural weakest link effect arising from differences in the volume of the plastic zone. is a function of not only the in-plane effect of the notch radius, but also an out-of-plane constraint loss which itself is enhanced by the presence of the notch radius. Significant out-of-plane constraint loss occurred for notched specimens with a ratio of thickness to width of 0.5, a geometry that if pre-cracked would have met the minimum thickness requirement mandated by ASTM E1820. Doubling the thickness to = 1.0 was sufficient to eliminate the out-of-plane constraint loss. The use of experimentally measured values in an NFAD assessment of a structure may therefore be non-conservative if <1.0.This paper is published with the permission of Wood, the University of Cantabria, and the UK Atomic Energy Authority. The authors of this work would like to express their gratitude for financial support from: - The Spanish Ministry of Science and Innovation, under project MAT2014-58443-P: “Análisis del comportamiento en fractura de componentes estructurales con defectos en condiciones debajo confinamiento tensional”, on which the results of this paper are based; - Wood, via a contribution to the R6 Development Programme; - The Research Councils UK (RCUK) Energy Programme [grant number EP/P012450/1].ElsevierUniversidad de Cantabria20202020-02-01journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articlehttp://hdl.handle.net/10902/20690International Journal of Pressure Vessels and Piping Volume 180, February 2020, 104025reponame:UCrea Repositorio Abierto de la Universidad de Cantabriainstname:Universidad de Cantabria (UC)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:repositorio.unican.es:10902/206902026-06-02T12:39:31Z
dc.title.none.fl_str_mv Out-of-plane constraint loss in three point bend specimens with notches
title Out-of-plane constraint loss in three point bend specimens with notches
spellingShingle Out-of-plane constraint loss in three point bend specimens with notches
Horn, A.J.
Blunt notch
Effective fracture toughness
Notch Failure Assessment Diagram
title_short Out-of-plane constraint loss in three point bend specimens with notches
title_full Out-of-plane constraint loss in three point bend specimens with notches
title_fullStr Out-of-plane constraint loss in three point bend specimens with notches
title_full_unstemmed Out-of-plane constraint loss in three point bend specimens with notches
title_sort Out-of-plane constraint loss in three point bend specimens with notches
dc.creator.none.fl_str_mv Horn, A.J.
Cicero González, Sergio|||0000-0002-3950-6071
Andrés Álvarez, David
author Horn, A.J.
author_facet Horn, A.J.
Cicero González, Sergio|||0000-0002-3950-6071
Andrés Álvarez, David
author_role author
author2 Cicero González, Sergio|||0000-0002-3950-6071
Andrés Álvarez, David
author2_role author
author
dc.contributor.none.fl_str_mv Universidad de Cantabria
dc.subject.none.fl_str_mv Blunt notch
Effective fracture toughness
Notch Failure Assessment Diagram
topic Blunt notch
Effective fracture toughness
Notch Failure Assessment Diagram
description ABSTRACT: This paper presents an experimental and numerical study of the effect of specimen thickness on the effective notch toughness for cleavage fracture measured using Single Edge Notch Bend (SENB) specimens containing a U-notch instead of a fatigue pre-crack. These specimens are typically used to measure a material's effective notch toughness and to assess failure of a structure containing a non-sharp defect using the Notch Failure Assessment Diagram (NFAD). Both the experimental data and the Finite Element (FE) failure predictions show a significant influence of specimen thickness on , over and above the microstructural weakest link effect arising from differences in the volume of the plastic zone. is a function of not only the in-plane effect of the notch radius, but also an out-of-plane constraint loss which itself is enhanced by the presence of the notch radius. Significant out-of-plane constraint loss occurred for notched specimens with a ratio of thickness to width of 0.5, a geometry that if pre-cracked would have met the minimum thickness requirement mandated by ASTM E1820. Doubling the thickness to = 1.0 was sufficient to eliminate the out-of-plane constraint loss. The use of experimentally measured values in an NFAD assessment of a structure may therefore be non-conservative if <1.0.
publishDate 2020
dc.date.none.fl_str_mv 2020
2020-02-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10902/20690
url http://hdl.handle.net/10902/20690
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.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv International Journal of Pressure Vessels and Piping Volume 180, February 2020, 104025
reponame:UCrea Repositorio Abierto de la Universidad de Cantabria
instname:Universidad de Cantabria (UC)
instname_str Universidad de Cantabria (UC)
reponame_str UCrea Repositorio Abierto de la Universidad de Cantabria
collection UCrea Repositorio Abierto de la Universidad de Cantabria
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300719

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