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oai:riubu.ubu.es:10259/56422021-11-02T12:04:45Zcom_10259_4201com_10259_5086com_10259_2604col_10259_4505

Verbeeten, Wilco M.H. Lorenzo Bañuelos, Miriam Saiz Ortiz, Rubén González, Rodrigo 2021-03-12T09:23:36Z 2021-03-12T09:23:36Z 2020 1355-2546 http://hdl.handle.net/10259/5642 10.1108/RPJ-12-2019-0317 Purpose – The purpose of the present paper is to quantify and analyze the strain-rate dependence of the yield stress for both unfilled acrylonitrilebutadiene- styrene (ABS) and short carbon fiber-reinforced ABS (CF-ABS) materials, fabricated via material extrusion additive manufacturing (MEAM). Two distinct and opposite infill orientation angles were used to attain anisotropy effects. Design/methodology/approach – Tensile test samples were printed with two different infill orientation angles. Uniaxial tensile tests were performed at five different constant linear strain rates. Apparent densities were measured to compensate for the voided structure. Scanning electron microscope fractography images were analyzed. An Eyring-type flow rule was evaluated for predicting the strain-rate-dependent yield stress. Findings – Anisotropy was detected not only for the yield stresses but also for its strain-rate dependence. The short carbon fiber-filled material exhibited higher anisotropy than neat ABS material using the same ME-AM processing parameters. It seems that fiber and molecular orientation influence the strain-rate dependence. The Eyring-type flow rule can adequately describe the yield kinetics of ME-AM components, showing thermorheologically simple behavior. Originality/value – A polymer’s viscoelastic behavior is paramount to be able to predict a component’s ultimate failure behavior. The results in this manuscript are important initial findings that can help to further develop predictive numerical tools for ME-AM technology. This is especially relevant because of the inherent anisotropy that ME-AM polymer components show. Furthermore, short carbon fiber-filled ABS enhanced anisotropy effects during ME-AM, which have not been measured previously. application/pdf eng Emerald Rapid Prototyping Journal. 2020, V. 26, n. 10. p. 1701–1712 http://dx.doi.org/10.1108/RPJ-12-2019-0317 ABS material Anisotropic strain-rate-dependent yield stress Eyring rate equation Fused filament fabrication (FFF) Infill orientation Polymer matrix composites (PMC) Apparent density Resistencia de materiales Strength of materials Strain-rate-dependent properties of short carbon fiber-reinforced acrylonitrile-butadiene-styrene using material extrusion additive manufacturing info:eu-repo/semantics/article info:eu-repo/semantics/submittedVersion info:eu-repo/semantics/openAccess Rapid Prototyping Journal 26 10 1701 1712