A numerical study of non-linear crack tip parameters
Crack closure concept has been widely used to explain different issues of fatigue crack propagation. However, different authors have questioned the relevance of crack closure and have proposed alternative concepts. The main objective here is to check the effectiveness of crack closure concept by l...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2015-07-01
|
| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_25.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841562337397440512 |
|---|---|
| author | F.V. Antunes R. Branco L. Correia AL Ramalho |
| author_facet | F.V. Antunes R. Branco L. Correia AL Ramalho |
| author_sort | F.V. Antunes |
| collection | DOAJ |
| description | Crack closure concept has been widely used to explain different issues of fatigue crack propagation.
However, different authors have questioned the relevance of crack closure and have proposed alternative
concepts. The main objective here is to check the effectiveness of crack closure concept by linking the contact
of crack flanks with non-linear crack tip parameters. Accordingly, 3D-FE numerical models with and without
contact were developed for a wide range of loading scenarios and the crack tip parameters usually linked to
fatigue crack growth, namely range of cyclic plastic strain, crack tip opening displacement, size of reversed
plastic zone and total plastic dissipation per cycle, were investigated. It was demonstrated that: i) LEFM
concepts are applicable to the problem under study; ii) the crack closure phenomenon has a great influence on
crack tip parameters decreasing their values; iii) the Keff concept is able to explain the variations of crack tip
parameters produced by the contact of crack flanks; iv) the analysis of remote compliance is the best numerical
parameter to quantify the crack opening level; v) without contact there is no effect of stress ratio on crack tip
parameters. Therefore it is proved that the crack closure concept is valid. |
| format | Article |
| id | doaj-art-b9ba96128ba1478a801bf3406f45abbf |
| institution | Kabale University |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2015-07-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-b9ba96128ba1478a801bf3406f45abbf2025-01-03T01:02:46ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932015-07-0193319920810.3221/IGF-ESIS.33.25A numerical study of non-linear crack tip parametersF.V. Antunes0R. Branco1L. Correia2AL Ramalho3University of Coimbra,PortugalPolytechnic Institute of CoimbraEscola Superior de TecnologiaEscola Superior de TecnologiaCrack closure concept has been widely used to explain different issues of fatigue crack propagation. However, different authors have questioned the relevance of crack closure and have proposed alternative concepts. The main objective here is to check the effectiveness of crack closure concept by linking the contact of crack flanks with non-linear crack tip parameters. Accordingly, 3D-FE numerical models with and without contact were developed for a wide range of loading scenarios and the crack tip parameters usually linked to fatigue crack growth, namely range of cyclic plastic strain, crack tip opening displacement, size of reversed plastic zone and total plastic dissipation per cycle, were investigated. It was demonstrated that: i) LEFM concepts are applicable to the problem under study; ii) the crack closure phenomenon has a great influence on crack tip parameters decreasing their values; iii) the Keff concept is able to explain the variations of crack tip parameters produced by the contact of crack flanks; iv) the analysis of remote compliance is the best numerical parameter to quantify the crack opening level; v) without contact there is no effect of stress ratio on crack tip parameters. Therefore it is proved that the crack closure concept is valid.http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_25.pdfFatigue crack propagationPlasticity induced crack closureNon-linear crack tip parameters |
| spellingShingle | F.V. Antunes R. Branco L. Correia AL Ramalho A numerical study of non-linear crack tip parameters Fracture and Structural Integrity Fatigue crack propagation Plasticity induced crack closure Non-linear crack tip parameters |
| title | A numerical study of non-linear crack tip parameters |
| title_full | A numerical study of non-linear crack tip parameters |
| title_fullStr | A numerical study of non-linear crack tip parameters |
| title_full_unstemmed | A numerical study of non-linear crack tip parameters |
| title_short | A numerical study of non-linear crack tip parameters |
| title_sort | numerical study of non linear crack tip parameters |
| topic | Fatigue crack propagation Plasticity induced crack closure Non-linear crack tip parameters |
| url | http://www.gruppofrattura.it/pdf/rivista/numero33/numero_33_art_25.pdf |
| work_keys_str_mv | AT fvantunes anumericalstudyofnonlinearcracktipparameters AT rbranco anumericalstudyofnonlinearcracktipparameters AT lcorreia anumericalstudyofnonlinearcracktipparameters AT alramalho anumericalstudyofnonlinearcracktipparameters AT fvantunes numericalstudyofnonlinearcracktipparameters AT rbranco numericalstudyofnonlinearcracktipparameters AT lcorreia numericalstudyofnonlinearcracktipparameters AT alramalho numericalstudyofnonlinearcracktipparameters |