Browsing by Subject "elastic properties"
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Item A Periodic Homogenization Model Including Porosity to Predict Elastic Properties of 3D-Printed Continuous Carbon Fiber-Reinforced Composites(University of Texas at Austin, 2021) Marchal, V.; Peryaut, F.; Zhang, Y.; Labed, N.Adding continuous carbon fiber into the Fused Filament Fabrication (FFF) process is critical to get reinforced composite structures with improved mechanical properties. However, it remains difficult for the designer to create optimized complex composite structures. Indeed, performing numerical simulations on these materials require to know their elastic coefficients, which are difficult to determine. Using a model of periodic homogenization which considers both the fiber content and the porosity, would be a quick solution to predict the mechanical properties of the printed composite. Based on material studies and validated mechanical tests, this simulation model allows the use of a homogeneous material to replace the composite material for the finite element analysis. This will greatly reduce the number of elements required in the model, leading to a big decrease of the computation cost. Hence, the numerical model has potential to perform simulation-driven design processes, such as generative design.Item Screw Swirling Effects on Fiber Orientation Distribution in Large-Scale Polymer Composite Additive Manufacturing(University of Texas at Austin, 2018) Wang, Zhaogui; Smith, Douglas E.Large-Scale Additive Manufacturing (LSAM) polymer deposition employs a single screw extruder to melt and deliver the pelletized feedstock resulting in significantly higher flow rates as compared to conventional filament-extrusion AM processes. Single screw swirling motion in the melt flow during processing generates a unique pattern of flow-induced fiber alignment when fiber-filled polymer feedstock is processed. This paper investigates the effect of the single screw swirling motion on the fiber orientation and predicted elastic properties of a printed extrudate. A finite element extruder nozzle flow is created, where the extruder screw tip, the extrusion nozzle, and a short section of free extrudate compose the melt flow domain. The IRD-RSC fiber orientation diffusion model is applied to capture the slow orientation kinetics of short fibers in the concentrated fiber suspension. The results indicate that the swirling motion of the flow has a direct effect on predicted fiber orientation distribution and the associated averaged elastic properties in the extruded composite bead.