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dc.contributor.authorVerbeeten, Wilco M.H. 
dc.contributor.authorLorenzo Bañuelos, Miriam 
dc.date.accessioned2022-08-30T08:04:45Z
dc.date.available2022-08-30T08:04:45Z
dc.date.issued2022-11
dc.identifier.issn2214-8604
dc.identifier.urihttp://hdl.handle.net/10259/6821
dc.description.abstractThe effect that the infill orientation angle has on the strain-rate dependence of the yield stress for material extrusion additive manufactured (ME-AM) PolyLactic Acid (PLA) material was investigated. Symmetric angleply stacking sequences were used to produce ME-AM tensile test samples. Measured yield stresses were compensated for the voided structure, typical of ME-AM components. Furthermore, molecular orientation and stretch was macroscopically assessed by a thermal shrinkage procedure. Additionally, hot-press compression molded (CM) samples were manufactured and mechanically characterized in uniaxial tensile and compression in order to determine the material’s isotropic bulk properties. Initial model parameters for the Ree–Eyring modification of the Eyring flow rule were determined using CM data. According to SEM fractography, all samples showed microscopically brittle fracture behavior. Notwithstanding, contrary to CM samples, ME-AM specimens showed macroscopically ductile stress–strain behavior and a transition from a regime with only a primary 𝛼-deformation process, at low strain rates, to a regime with 2 deformation processes (𝛼 + 𝛽), at high strain rates. These effects are an influence of the processing step and are attributed to the molecular orientation and stretch of the polymer chains, provoking anisotropic mechanical properties. As a consequence, a deformation-induced change of the Eyring rate constants is needed to adequately describe the strain-rate dependence of the ME-AM yield stress behavior, leaving the initial activation volumes unchanged. Taking this deformation-dependence of the rate constants into account, yield stresses as a function of infill orientation angle can be appropriately predicted.en
dc.format.mimetypeapplication/pdf
dc.language.isoenges
dc.publisherElsevieres
dc.relation.ispartofAdditive Manufacturing. 2022, V. 59, Part A, 103079es
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectPLAen
dc.subjectAngle-ply laminate configurationen
dc.subjectAnisotropic strain-rate dependent yield stressen
dc.subjectRee–Eyring rate equationen
dc.subject.otherResistencia de materialeses
dc.subject.otherStrength of materialsen
dc.subject.otherIngeniería civilen
dc.subject.otherCivil engineeringen
dc.subject.otherMateriales de construcciónes
dc.subject.otherBuilding materialsen
dc.titleMaterial Extrusion Additive Manufacturing of Poly(Lactic Acid): Influence of infill orientation angleen
dc.typeinfo:eu-repo/semantics/articlees
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.relation.publisherversionhttps://doi.org/10.1016/j.addma.2022.103079es
dc.identifier.doi10.1016/j.addma.2022.103079
dc.journal.titleAdditive Manufacturinges
dc.volume.number59es
dc.page.initial103079es
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersiones


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