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International Journal of Rapid Manufacturing (4 papers in press)
Investigation on mechanical properties for PolyJet printed parts involving material reduction strategy by Arivazhagan Pugalendhi, Rajesh Ranganathan, Sreekanth M.P., Sivakumar Ganesan Abstract: Additive manufacturing (AM), a tool less manufacturing process has the advantage of saving material; however, this is not a wastage free manufacturing technology. Material wastage is more due to material replacement in the case of PolyJet technology. This work concentrates on finding a solution to minimize the wastage of material and compare the mechanical properties of PolyJet printed specimens in Single Material (SM) mode and Digital Material (DM) mode. In order to minimize the wastage, modified mixed tray strategy is proposed and it is validated by case example. Six different combinations of test specimens are derived from available three printing modes of Objet260 Connex PolyJet is high quality (HQ), high speed (HS) and digital material (DM) along with matte (M) and glossy (G) finish. Those combinations named as: HQ-M, HQ-G, HS-M, HS-G, DM-M and DM-G. It was identified that the proposed technique is capable of saving material. The developed strategy of DM-G saves 45.82% and 41.47% of total material cost in HQ-G and HS-G respectively. Similarly, DM-M saves 32.2% of total material cost in HQ-M and 24.22% in HS-M. Findings indicate that specimens printed by DM mode explicate low mechanical strength than SM mode. Average tensile strength of VeroClear is 6.783% lower in DM-G and 19.57% lower in DM-M, when compared to standard value (57.5 MPa). This work provides the awareness of the material replacement and increase the fidelity of the PolyJet printed parts. Keywords: Additive manufacturing; PolyJet; material reduction; flushing; modified mixed tray.
Special Issue on: RDPM2019 Advances in Additive Manufacturing Technology and Applications
Mass optimisation of 3D printed specimens using Multivariable Regression Analysis by Cristian-Vasile DOICIN, Mihaela-Elena ULMEANU, Allan E.W. RENNIE, Elena LUPEANU Abstract: Since its introduction in the early 1990s Fused Deposition Modelling (FDM) has become the most popular additive manufacturing technology for a variety of applications. One of the reasons of its popularity amongst users is the affordability of the equipment, materials and the open source software. Given the large variety of combinations optimisation of FDM process parameters can be quite elaborate. The paper provides a method for optimisation of mass calculation using multivariable regression analysis. Layer thickness, printing temperature and printing speed were considered the independent variables for a two-level factorial experimental program. DOE was used to plan 12 sets of programs and analysis was undertaken using Design-Expert Keywords: Optimised Mass Calculation; Material Extrusion; Design of Experiments; Multivariable Regression Analysis.
The effect of geometry on tensile strength of biodegradable polylactic-acid tensile-test specimens by material extrusion by Alper Ekinci, Andrew A. Johnson, Andrew Gleadall, Xiaoxiao Han Abstract: Additive manufactured biomedical devices have been widely used in the biomedical fields due to the development of biomaterials and manufacturing techniques. Biodegradable Polylactic Acid-based polymers are the most common material that can be manufactured using material extrusion, one of the most widely known additive manufacturing methods. However, medical grade polymers are too expensive for degradation studies with common tensile specimens. Therefore, this paper aims to reduce the volume of the material used for manufacturing tensile specimens by introducing a new micro-X tensile specimen developed for steel. The tensile strength of micro-X tensile specimens were compared with the ASTM D1708 standard tensile specimens. Experimental results and statistical analysis showed that there was no significant difference in terms of Tensile Strength. Furthermore, the micro-X tensile specimen reduced the volume and as well as the cost to 1% in comparison to ASTM D638 type V standard tensile specimens. Keywords: Additive Manufacturing; Material Extrusion; Tensile Strength; Biodegradable PLA; Micro Tensile Test; statistical analysis.
Post-printing Characterisation and Design for Additive Manufacturing Considerations for Conductive Tracks 3D Printed by Material Extrusion by Marko Chorbikj, Marco Cavallaro Abstract: The goal of the study is to analyse the post-printing characteristics of conductive tracks 3d printed using Material Extrusion (ME) process with varying slicing strategies. Conductive track samples with constant width and varying heights between 0.4mm and 0.8mm were prepared using two different commercial conductive materials in a single, double and triple layer strategy. Post-printing functional analysis was done by measuring the resistance of samples at different lengths and comparing it to their corresponding counterparts fabricated with different slicing. Post-printing physical characterisation on selected samples was done by measuring the surface area of their cross sections using microscope images and their mass. The conclusions of the study were then transferred in a proposed set of Design for Additive Manufacturing (DfAM) considerations that can be taken into account in the Design and Process Planning phase when manufacturing conductive tracks or objects with such features using ME. Keywords: material extrusion; design for additive manufacturing; conductive tracks; traces; 3d printing; fused filament fabrication.