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

Theocaris, PS; Gdoutos, EE

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