Fatigue apparatus for geometrically complex non-standardized specimens

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dc.contributor.authorNascimento, Marcelino P. [UNESP]
dc.contributor.authorVoorwald, Herman J.C. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:23:51Z
dc.date.available2014-05-27T11:23:51Z
dc.date.issued2009-01-01
dc.description.abstractStandard Test Methods (e.g. ASTM, DIN) for materials characterization in general, and for fatigue in particular, do not contemplate specimens with complex geometries, as well as the combination of axial and in-plane bending loads in their methodologies. The present study refers to some patents and the new configuration or configurations of specimens (non-standardized by the status quo of test methods) and a device developed to induce axial and bending combined forces resultants from axial loads applied by any one test equipment (dynamic or monotonic) which possesses such limitation, towards obtaining more realistic results on the fatigue behavior, or even basic mechanical properties, from geometrically complex structures. Motivated by a specific and geometrically complex aeronautic structure (motor-cradle), non-standardized welded tubular specimens made from AISI 4130 steel were fatigue-tested at room temperature, by using a constant amplitude sinusoidal load of 20 Hz frequency, load ratio R = 0.1 with and without the above referred auxiliary fatigue apparatus. The results showed the fatigue apparatus was efficient for introducing higher stress concentration factor at the welded specimen joints, consequently reducing the fatigue strength when compared to other conditions. From the obtained results it is possible to infer that with small modifications the proposed apparatus will be capable to test a great variety of specimen configurations such as: squared tubes and plates with welded or melted junctions, as well as other materials such as aluminum, titanium, composites, polymeric, plastics, etc. © 2009 Bentham Science Publishers Ltd.en
dc.description.affiliationDepartment of Materials and Technology State University of São Paulo-UNESP/FEG, 333, Ariberto Pereira da Cunha Ave., CEP 12500-000, Guaratingueta City, Sao Paulo State
dc.description.affiliationUnespDepartment of Materials and Technology State University of São Paulo-UNESP/FEG, 333, Ariberto Pereira da Cunha Ave., CEP 12500-000, Guaratingueta City, Sao Paulo State
dc.format.extent48-54
dc.identifierhttp://dx.doi.org/10.2174/1874477X10902010048
dc.identifier.citationRecent Patents on Mechanical Engineering, v. 2, n. 1, p. 48-54, 2009.
dc.identifier.doi10.2174/1874477X10902010048
dc.identifier.issn1874-477X
dc.identifier.scopus2-s2.0-77951632776
dc.identifier.urihttp://hdl.handle.net/11449/70894
dc.language.isoeng
dc.relation.ispartofRecent Patents on Mechanical Engineering
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectCombined in-plane bending moment and axial loadings
dc.subjectFatigue apparatus
dc.subjectHot-spot stress concentration factor
dc.subjectNon-standardized specimens
dc.subjectWelded tubular specimens
dc.subjectAeronautic structures
dc.subjectAISI 4130 steel
dc.subjectAxial loading
dc.subjectCombined forces
dc.subjectComplex geometries
dc.subjectComplex structure
dc.subjectConstant amplitude
dc.subjectFatigue behavior
dc.subjectFatigue strength
dc.subjectHot-spot stress
dc.subjectIn-plane bending
dc.subjectIn-plane bending moment
dc.subjectLoad ratio
dc.subjectMaterials characterization
dc.subjectRoom temperature
dc.subjectSinusoidal load
dc.subjectStandard test method
dc.subjectStress concentration factors
dc.subjectTest equipments
dc.subjectTest method
dc.subjectTubular specimens
dc.subjectAxial loads
dc.subjectBending (deformation)
dc.subjectBending moments
dc.subjectCrack initiation
dc.subjectFatigue of materials
dc.subjectMechanical properties
dc.subjectPipeline bends
dc.subjectStress analysis
dc.subjectTitanium
dc.subjectWelding
dc.subjectStress concentration
dc.titleFatigue apparatus for geometrically complex non-standardized specimensen
dc.typeArtigo
dcterms.licensehttp://eurekaselect.com/209
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Guaratinguetápt

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