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The modified Dugdale-Barenblatt model adapted to various fracture configurations in metals

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dc.contributor.author Theocaris, PS en
dc.contributor.author Gdoutos, EE en
dc.date.accessioned 2014-03-01T01:05:31Z
dc.date.available 2014-03-01T01:05:31Z
dc.date.issued 1974 en
dc.identifier.issn 0376-9429 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/8863
dc.subject Internal Stress en
dc.subject Model Adaptation en
dc.subject Strain Hardening en
dc.subject Stress Distribution en
dc.subject Yield Stress en
dc.subject.classification Mechanics en
dc.subject.other PLATES - Failure en
dc.subject.other STRAIN HARDENING en
dc.subject.other METALS AND ALLOYS en
dc.title The modified Dugdale-Barenblatt model adapted to various fracture configurations in metals en
heal.type journalArticle en
heal.identifier.primary 10.1007/BF00155258 en
heal.identifier.secondary http://dx.doi.org/10.1007/BF00155258 en
heal.language English en
heal.publicationDate 1974 en
heal.abstract The Dugdale-Barenblatt model is extended to encompass the influence of strain hardening on the plastic enclaves developed at the tips of a crack in a plate subjected to tension at infinity. While in the DB-model the distribution of internal stresses along the plastic zone in the extension of the crack length was taken constant and equal to the yield stress, in the modified version of this model this distribution is taken variable with a minimum value the yield stress (σ0) and a maximum value (σmax depending on the loading step and the amount of strain-hardening of the material. Six different configurations of stress distribution in the plastic enclaves were considered with various values of the ratio σmax/σ0. For each stress configuration and for various loading steps the shape of the respective caustic corresponding to the singularity created at the plastic zone near the crack tip was computed by modifying appropriately Dugdale's theory to each of the six configurations in the plastic enclave. The caustic was formed by reflections of a parallel coherent light beam at the vicinity of the crack-tip. Three different types of steel were examined with different stress-strain relations and different amounts of strain-hardening. By comparing the shapes of the theoretically derived caustics by using each of the stress configurations of the modified DB-model with the shapes of the experimentally obtained caustics for the corresponding loading step it was possible to adapt the DB-model to each case of material, to disclose the influence of strain-hardening on the fracture mode of the material and to indicate the most probable profile of stress distribution in the plastic zone as the loading is increased and further plastic deformation is established in the specimen. Interesting results have been revealed on the influence of strain hardening in the fracture mode of metals. © 1974 Noordhoff International Publishing. en
heal.publisher Kluwer Academic Publishers en
heal.journalName International Journal of Fracture en
dc.identifier.doi 10.1007/BF00155258 en
dc.identifier.isi ISI:A1974U829600010 en
dc.identifier.volume 10 en
dc.identifier.issue 4 en
dc.identifier.spage 549 en
dc.identifier.epage 564 en


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