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dc.contributor.authorTorres, M. A.S. [UNESP]
dc.contributor.authorSilva, B. R.L. [UNESP]
dc.contributor.authorCosta, D. H.S.
dc.contributor.authorBaptista, C. A.R.P.
dc.contributor.authorPastoukhov, V.
dc.identifier.citationKey Engineering Materials, v. 754 KEM, p. 43-46.
dc.description.abstractThe usual approaches for Fatigue Crack Growth (FCG) assessment are based on semiempirical models that consider the stress intensity factor range of fracture mechanics, ΔK, as the governing driving force for crack propagation. However, FCG data incorporating compressive loads have brought discussions and controversies. The compressive loads are not taken into account in the usual life prediction codes and the negative portion of the loading cycle is neglected. In the present work, constant amplitude fatigue crack growth tests with load ratios -1 and 0 are performed, for two diferent stess levels, in AA 6005 alloy centre-notched middle tension M(T) specimens and the obtained results are discussed. It is shown that the crack closure concept, that usually work well for positive ratios, is not enough to satisfactorily explain the negative load ratio effects. The results also showed how the negative part of the load affected the propagation rate of the crack, mainly for larger cracks and smaller loads. Finally, it is shown that a previously proposed expression for the stress distribution ahead of the crack can shed some light on this question.en
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.relation.ispartofKey Engineering Materials
dc.subjectAA 6005 alloy
dc.subjectFatigue crack propagation
dc.subjectNegative stress ratio
dc.titleFatigue crack growth in an Al-Mg-Si alloy under negative load ratioen
dc.typeTrabalho apresentado em evento
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionDivisão de Sistemas Aeronáuticos (ASA)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.description.affiliationFEG UNESP College of Engineering Campus Guaratinguetá Department of Mechanics, 333 Ariberto Pereira da Cunha Ave
dc.description.affiliationIAE DCTA Institute of Aeronautics and Space Laboratório de Ensaios Estruturais Divisão de Sistemas Aeronáuticos (ASA)
dc.description.affiliationEEL USP Engineering School of Lorena University of São Paulo Department of Materials Engineering
dc.description.affiliationUnespFEG UNESP College of Engineering Campus Guaratinguetá Department of Mechanics, 333 Ariberto Pereira da Cunha Ave
dc.rights.accessRightsAcesso aberto
dc.description.sponsorshipIdCNPq: 456808/2014
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