Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields
The current work presents a novel methodology for the experimental quantification of the crack tip plastic zone during fatigue crack growth. This methodology is based on the application of yield criteria to estimate the area and the shape of the plastic zone at the crack tip. The implementation of t...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2017-07-01
|
| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero41/numero_41_art_23.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841564493546520576 |
|---|---|
| author | J.M. Vasco-Olmo F.A. Díaz M.N. James C.J. Christopher E.A. Patterson |
| author_facet | J.M. Vasco-Olmo F.A. Díaz M.N. James C.J. Christopher E.A. Patterson |
| author_sort | J.M. Vasco-Olmo |
| collection | DOAJ |
| description | The current work presents a novel methodology for the experimental quantification of the crack tip plastic zone during fatigue crack growth. This methodology is based on the application of yield criteria to estimate the area and the shape of the plastic zone at the crack tip. The implementation of the proposed methodology requires the use of strain maps calculated from the differentiation of the displacement fields obtained by digital image correlation (DIC). Stress maps can subsequently be inferred from both von Mises and Tresca yield criteria. Fatigue tests and associated measurements of plastic zone size and shape were conducted on a compacttension specimen made from commercially pure titanium at R ratio of 0.6. In addition, the ability to predict the shape and size of the experimentally observed crack tip plastic zone has been explored using three different analytical elastic crack tip models [Westergaard, Williams and ChristopherJames-Patterson (CJP)]. This analysis indicated that the CJP model provided the most accurate prediction of the plastic zone and shape. |
| format | Article |
| id | doaj-art-cd658ee71ce34bfe9ef5d0a20e0939df |
| institution | Kabale University |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2017-07-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-cd658ee71ce34bfe9ef5d0a20e0939df2025-01-02T22:38:31ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932017-07-01114116617410.3221/IGF-ESIS.41.23Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fieldsJ.M. Vasco-Olmo0 F.A. Díaz 1M.N. James2 C.J. Christopher 3E.A. Patterson 4University of Jaén, Spain University of Jaén, Spain University of Plymouth, UKUniversity of Plymouth, UKUniversity of Liverpool, UK The current work presents a novel methodology for the experimental quantification of the crack tip plastic zone during fatigue crack growth. This methodology is based on the application of yield criteria to estimate the area and the shape of the plastic zone at the crack tip. The implementation of the proposed methodology requires the use of strain maps calculated from the differentiation of the displacement fields obtained by digital image correlation (DIC). Stress maps can subsequently be inferred from both von Mises and Tresca yield criteria. Fatigue tests and associated measurements of plastic zone size and shape were conducted on a compacttension specimen made from commercially pure titanium at R ratio of 0.6. In addition, the ability to predict the shape and size of the experimentally observed crack tip plastic zone has been explored using three different analytical elastic crack tip models [Westergaard, Williams and ChristopherJames-Patterson (CJP)]. This analysis indicated that the CJP model provided the most accurate prediction of the plastic zone and shape.http://www.gruppofrattura.it/pdf/rivista/numero41/numero_41_art_23.pdf. Crack tip plastic zoneFatigueCrack tip fieldsCrack shieldingStress intensity factorDIC |
| spellingShingle | J.M. Vasco-Olmo F.A. Díaz M.N. James C.J. Christopher E.A. Patterson Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields Fracture and Structural Integrity . Crack tip plastic zone Fatigue Crack tip fields Crack shielding Stress intensity factor DIC |
| title | Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields |
| title_full | Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields |
| title_fullStr | Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields |
| title_full_unstemmed | Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields |
| title_short | Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields |
| title_sort | experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields |
| topic | . Crack tip plastic zone Fatigue Crack tip fields Crack shielding Stress intensity factor DIC |
| url | http://www.gruppofrattura.it/pdf/rivista/numero41/numero_41_art_23.pdf |
| work_keys_str_mv | AT jmvascoolmo experimentalmethodologyforthequantificationofcracktipplasticzoneandshapefromtheanalysisofdisplacementfields AT fadiaz experimentalmethodologyforthequantificationofcracktipplasticzoneandshapefromtheanalysisofdisplacementfields AT mnjames experimentalmethodologyforthequantificationofcracktipplasticzoneandshapefromtheanalysisofdisplacementfields AT cjchristopher experimentalmethodologyforthequantificationofcracktipplasticzoneandshapefromtheanalysisofdisplacementfields AT eapatterson experimentalmethodologyforthequantificationofcracktipplasticzoneandshapefromtheanalysisofdisplacementfields |