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New approach for analysis of complex multiaxial loading paths

2014-05Journal article Restricted access
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dc.contributor.authorAnes, V.
dc.contributor.authorReis, L.
dc.contributor.authorLi, B.
dc.contributor.authorFonte, M.
dc.contributor.authorFreitas, M.
dc.date.accessioned2024-09-12T10:49:12Z
dc.date.available2024-09-12T10:49:12Z
dc.date.issued2014-05
dc.description.abstractExperimentally, it has been proven that the stress level needed to cause fatigue failure in pure shear is less than the axial one. This fact has led to consider a stress scale factor between shear and axial stress in order to reduce different applied stresses to the same shear stress space or principal stress space to facilitate the yielding analysis or fatigue damage evaluations. In this way most of multiaxial fatigue models use a stress scale factor to consider the fatigue damage contributions from the axial and shear stress components regarding the material strength degradation. Much efforts were made to quantify the effective shear and axial stress amplitudes under a three-dimensional stress state, however, the combined damage resulted from those amplitudes have been reduced to a constant value. In some cases, the approaches used proved to be inadequate, leading to compute the same equivalent stress for different loading paths with different fatigue lives. In this work it is performed a series of multiaxial fatigue tests on a high-strength steel in order to determine the multiaxial fatigue strength under proportional and non-proportional loading conditions. A stress scale factor function was mapped based on the experimental results using as arguments, the axial stress amplitude and the stress amplitude ratio, which has proven to be sensitive to the loading path nature. Using the stress scale factor surface an equivalent shear stress was defined and it was used in the fatigue life correlation. Results indicate that the stress scale factor (ssf) is not a constant value and it is strongly dependent on stress amplitude level and loading path shape. The equivalent stress was successfully applied to proportional and non-proportional loading paths with satisfactory results.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAnes, V., Reis, L., Li, B., Fonte, M., & De Freitas, M. (2014). New approach for analysis of complex multiaxial loading paths. International Journal of Fatigue, 62, 21-33.pt_PT
dc.identifier.doihttps://doi.org/10.1016/j.ijfatigue.2013.05.004pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.26/52049
dc.language.isoengpt_PT
dc.publisherElsevierpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectMultiaxial fatiguept_PT
dc.subjectEquivalent stresspt_PT
dc.subjectStress amplitude ratiopt_PT
dc.subjectStress scale factorpt_PT
dc.subjectExperimental testspt_PT
dc.titleNew approach for analysis of complex multiaxial loading pathspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage33pt_PT
oaire.citation.startPage21pt_PT
oaire.citation.titleInternational Journal of Fatiguept_PT
oaire.citation.volume62pt_PT
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT

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