2026-04-29T08:40:55Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/56412021-11-02T12:04:45Zcom_10259_4201com_10259_5086com_10259_2604col_10259_4505

00925njm 22002777a 4500 dc Verbeeten, Wilco M.H. author Arnold-Bik, Rob J. author Lorenzo Bañuelos, Miriam author 2021-01 The strain-rate sensitivity of the yield stress for Acrylonitrile-Butadiene-Styrene (ABS) tensile samples processed via material extrusion additive manufacturing (ME-AM) was investigated. Such specimens show molecular orientation and interstitial voids that affect the mechanical properties. Apparent densities were measured to compensate for the interstitial voids. Three different printing speeds were used to generate ME-AM tensile test samples with different molecular orientation. Printing velocities influenced molecular orientation and stretch, as determined from thermal shrinkage measurements. Likewise, infill velocity affected the strain-rate dependence of the yield stress. The ABS material manifests thermorheollogically simple behavior that can correctly be described by an Eyring flow rule. The changing activation volume, as a result of a varying print velocity, scales linearly with the molecular orientation, as captured in an estimated processing-induced pre-strain. Therefore, it is suggested that ME-AM processed ABS shows a deformation-dependent activation volume. This paper can be seen as initial work that can help to improve quantitative predictive numerical tools for ME-AM, taking into account the effects that the processing step has on the mechanical properties. http://hdl.handle.net/10259/5641 10.3390/polym13010149 2073-4360 3D printing ABS printing speed strain-rate dependent yield stress process-induced molecular orientation Eyring rate equation strain-dependent activation volume Print velocity effects on strain-rate sensitivity of acrylonitrile-butadiene-styrene using material extrusion additive manufacturing