Effect of angle and thickness of cell wall on bending behavior of auxetic beam

dc.contributor.authorKahraman, Mehmet Fatih
dc.contributor.authorGenel, Kenan
dc.date.accessioned2024-09-25T19:56:24Z
dc.date.available2024-09-25T19:56:24Z
dc.date.issued2024
dc.departmentAbant İzzet Baysal Üniversitesien_US
dc.description.abstractAuxetic (Aux) structures, which exhibit unique mechanical properties due to the tunability of negative Poisson's ratio (NPR), have become great attention in recent years. In this work, the bending response and energy absorption behavior of beam structure in which the auxetic cells are oriented along the beam axis under bending are systematically investigated for various thicknesses and angles (55-85 degree) of walls experimentally and numerically. The beam structure was manufactured from AISI 316 L stainless steel by Powder Bed Fusion (PBF) additive manufacturing method, and three-point bending test was employed to determine the mechanical properties. The results revealed that the auxetic cross-section subjected to loading shrinks relating to NPR, orienting the outer wall inward thus reducing local buckling effect causing the main damage mechanism. It was also found that increasing the cell wall angle with the same relative density (rho = 0.485) owing to the change in the negative Poisson's ratio of the cross-section was beneficial in improving the load carrying and energy absorption capacity of Aux beam. However, increasing the cell wall angle up to a certain value (75 degrees) provides a significant benefit in the bending performance of the beam. The cell wall angle takes larger values resulting in a negligible increase in performance, whereas damage occurs at lower displacements. Moreover, the performance of the Aux beam can be improved by functionally graded thickness of the auxetic cell wall, increasing the specific load carrying (SLC) and specific energy absorption (SEA) capacity. By grading the cell wall thickness of the structure with the best mechanical performance according to the cell angle 75 degrees, it is understood that SLC and SEA values can be increased by 19.4% and 25.4%, respectively. This research is estimated to ensure a valuable reference for improving the bending response of the auxetic cross-section beams.en_US
dc.description.sponsorshipSakarya University Scientific Research Project [2020-7-25-26]en_US
dc.description.sponsorshipAcknowledgements This study was supported by Sakarya University Scientific Research Project, project number 2020-7-25-26.en_US
dc.identifier.doi10.1016/j.mtcomm.2024.108339
dc.identifier.issn2352-4928
dc.identifier.scopus2-s2.0-85185557018en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.urihttps://doi.org/10.1016/j.mtcomm.2024.108339
dc.identifier.urihttps://hdl.handle.net/20.500.12491/13284
dc.identifier.volume38en_US
dc.identifier.wosWOS:001202894600001en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofMaterials Today Communicationsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.snmzYK_20240925en_US
dc.subjectAuxeticen_US
dc.subjectAdditive manufacturingen_US
dc.subjectBending testen_US
dc.subjectFunctional gradingen_US
dc.titleEffect of angle and thickness of cell wall on bending behavior of auxetic beamen_US
dc.typeArticleen_US

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