3D thickness effects around notch and crack tip stress/strain fields
Notches and cracks are usually approximately modeled as two-dimensional problems using solutions from plane elasticity to quantify localized stress/strain concentration effects around their tips. However, they may be associated with high gradients that can severely restrict local Poisson-induced tr...
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Gruppo Italiano Frattura
2015-06-01
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Online Access: | https://www.fracturae.com/index.php/fis/article/view/1478 |
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doaj-02120e87aed141ffa928311b01eae22d2021-01-27T17:17:03ZengGruppo Italiano FratturaFrattura ed Integrità Strutturale1971-89932015-06-019333D thickness effects around notch and crack tip stress/strain fieldsR.C.O. GóesJ.T.P. CastroM.A. Meggiolaro Notches and cracks are usually approximately modeled as two-dimensional problems using solutions from plane elasticity to quantify localized stress/strain concentration effects around their tips. However, they may be associated with high gradients that can severely restrict local Poisson-induced transversal strains and cause important 3D stress fields around those tips. Fatigue crack initiation and growth, plastic zone sizes and shapes, and localized constraint effects that affect toughness are typical problems associated with such 3D effects, which may lead to non-conservative damage and life predictions if neglected. To quantify how important they can be, first finite element techniques are used to simulate thickness and notch-tip radius effects in the fields around such tips, and to evaluate their importance from the structural design point of view. Then, versatile sub-modeling techniques are used to study similar effects along the fronts of short and long cracks, and a stepwise re-meshing routine is used to show how an initially straight crack must slightly curve its front during its propagation by fatigue, due to the unavoidable 3D effects that always surround real crack tips. https://www.fracturae.com/index.php/fis/article/view/14783D notch and crack tip fields |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
R.C.O. Góes J.T.P. Castro M.A. Meggiolaro |
spellingShingle |
R.C.O. Góes J.T.P. Castro M.A. Meggiolaro 3D thickness effects around notch and crack tip stress/strain fields Frattura ed Integrità Strutturale 3D notch and crack tip fields |
author_facet |
R.C.O. Góes J.T.P. Castro M.A. Meggiolaro |
author_sort |
R.C.O. Góes |
title |
3D thickness effects around notch and crack tip stress/strain fields |
title_short |
3D thickness effects around notch and crack tip stress/strain fields |
title_full |
3D thickness effects around notch and crack tip stress/strain fields |
title_fullStr |
3D thickness effects around notch and crack tip stress/strain fields |
title_full_unstemmed |
3D thickness effects around notch and crack tip stress/strain fields |
title_sort |
3d thickness effects around notch and crack tip stress/strain fields |
publisher |
Gruppo Italiano Frattura |
series |
Frattura ed Integrità Strutturale |
issn |
1971-8993 |
publishDate |
2015-06-01 |
description |
Notches and cracks are usually approximately modeled as two-dimensional problems using solutions from
plane elasticity to quantify localized stress/strain concentration effects around their tips. However, they may be associated with high gradients that can severely restrict local Poisson-induced transversal strains and cause important 3D stress fields around those tips. Fatigue crack initiation and growth, plastic zone sizes and shapes, and localized constraint effects that affect toughness are typical problems associated with such 3D effects, which may lead to non-conservative damage and life predictions if neglected. To quantify how important they can be, first finite element techniques are used to simulate thickness and notch-tip radius effects in the fields around such tips, and to evaluate their importance from the structural design point of view. Then, versatile sub-modeling techniques are used to study similar effects along the fronts of short and long cracks, and a stepwise re-meshing routine is used to show how an initially straight crack must slightly curve its front during its propagation by fatigue, due to the unavoidable 3D effects that always surround real crack tips.
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topic |
3D notch and crack tip fields |
url |
https://www.fracturae.com/index.php/fis/article/view/1478 |
work_keys_str_mv |
AT rcogoes 3dthicknesseffectsaroundnotchandcracktipstressstrainfields AT jtpcastro 3dthicknesseffectsaroundnotchandcracktipstressstrainfields AT mameggiolaro 3dthicknesseffectsaroundnotchandcracktipstressstrainfields |
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