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dc.contributor.author
 hal.structure.identifier
WANG, Zhen-Pei
301111 National University of Singapore [NUS]
dc.contributor.author
 hal.structure.identifier
POH, Leong Hien
301111 National University of Singapore [NUS]
dc.contributor.author
 hal.structure.identifier
DIRRENBERGER, Justin
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
dc.contributor.author
 hal.structure.identifier
ZHU, Yilin
301111 National University of Singapore [NUS]
dc.contributor.author
 hal.structure.identifier
FOREST, Samuel
1157 Centre des Matériaux [CDM]
dc.date.accessioned2017
dc.date.available2017
dc.date.issued2017
dc.date.submitted2017
dc.identifier.issn0045-7825
dc.identifier.urihttp://hdl.handle.net/10985/12036
dc.description.abstractAn important feature that drives the auxetic behaviour of the star-shaped auxetic structures is the hinge-functional connection at the vertex connections. This feature poses a great challenge for manufacturing and may lead to significant stress concentrations. To overcome these problems, we introduced smoothed petal-shaped auxetic structures, where the hinges are replaced by smoothed connections. To accommodate the curved features of the petal-shaped auxetics, a parametrisation modelling scheme using multiple NURBS patches is proposed. Next, an integrated shape design frame work using isogeometric analysis is adopted to improve the structural performance. To ensure a minimum thickness for each member, a geometry sizing constraint is imposed via piece-wise bounding polynomials. This geometry sizing constraint, in the context of isogeometric shape optimization, is particularly interesting due to the non-interpolatory nature of NURBS basis. The effective Poisson ratio is used directly as the objective function, and an adjoint sensitivity analysis is carried out. The optimized designs – smoothed petal auxetic structures – are shown to achieve low negative Poisson’s ratios, while the difficulties of manufacturing the hinges are avoided. For the case with six petals, an in-plane isotropy is achieved.
dc.description.sponsorshipSingapore MOE Tier 2 Grant R302000139112
dc.language.isoen
dc.publisherElsevier
dc.rightsPost-print
dc.subjectisogeometric shape optimization
dc.subjectauxetic material
dc.subjectnegative Poisson's ratio
dc.subjectsizing constraint
dc.subjectcomputational periodic homogenization
dc.subjectadjoint method
dc.titleIsogeometric shape optimization of smoothed petal auxetic structures via computational periodic homogenization
ensam.embargo.terms2017-11-30
dc.identifier.doi10.1016/j.cma.2017.05.013
dc.typdocArticle dans une revue avec comité de lecture
dc.localisationCentre de Paris
dc.subject.halSciences de l'ingénieur: Matériaux
dc.subject.halSciences de l'ingénieur: Mécanique
dc.subject.halSciences de l'ingénieur: Mécanique: Matériaux et structures en mécanique
dc.subject.halSciences de l'ingénieur: Mécanique: Mécanique des matériaux
dc.subject.halSciences de l'ingénieur: Mécanique: Mécanique des solides
dc.subject.halSciences de l'ingénieur: Mécanique: Mécanique des structures
ensam.audienceNon spécifiée
ensam.page250-271
ensam.journalComputer Methods in Applied Mechanics and Engineering
ensam.volume323
ensam.peerReviewingOui
hal.description.error{"duplicate-entry":{"hal-01540814":{"doi":"1.0"}}}
hal.statusunsent


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