Forthcoming and Online First Articles

International Journal of Experimental Design and Process Optimisation

International Journal of Experimental Design and Process Optimisation (IJEDPO)

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International Journal of Experimental Design and Process Optimisation (3 papers in press)

Regular Issues

  •   Free full-text access Open AccessProcess window development of DED-LB/M process with coaxial wire for stainless steel AISI 316L
    ( Free Full-text Access ) CC-BY-NC-ND
    by Panagiotis Stavropoulos, Harry Bikas, Konstantinos Tzimanis, Nikos Porevopoulos, Adriano Nicola Pilagatti, Eleonora Atzeni, Luca Iuliano, Alessandro Salmi 
    Abstract: This work is focused on the development of a process window for the Laser-based Directed Energy Deposition Additive Manufacturing (AM) process with coaxial wire as feedstock (DED-LB/M) as well as on the investigation of the significance of process parameters on the bead dimensions. This study employs a dual-pronged experimental approach: a one-factor-at-a-time (OFAT) evaluation for qualitative analysis of track dimensions and delineation of the process window, coupled with a full factorial design to derive response surfaces for AISI 316L stainless steel. The aim of this work is to identify the appropriate process parameters by examining the width, height and depth dimensions of the bead and the generation of process related knowledge so as to be used in further experimental work and for process control.
    Keywords: directed energy deposition; DED; additive manufacturing; laser-based process; coaxial wire; bead dimensions; design of experiment; AISI 316L; process knowledge; process control.
    DOI: 10.1504/IJEDPO.2024.10063465
     
  • Optimised development of a prototype selective laser sintering powder recoating system via analytic hierarchy process   Order a copy of this article
    by Panagiotis Avrampos 
    Abstract: This article presents the methodological design and manufacturing of a prototype powder recoating system (PRS) for a custom selective laser sintering (SLS) machine aimed at investigating/modelling and benchmarking the process as regards polymer powders. Firstly, available powder deposition methods are examined, namely: mechanical, electrostatic, vibrational, aerosol-assisted spray and tower nozzle deposition. The analytic hierarchy process (AHP) is used to systematically compare and rank them according to criteria like: calibration need, spreading speed, deposited surface quality, functional simplicity, control/automation ease, manufacturing ease and cost. Mechanical method is found to be the most advantageous. Then, a custom PRS utilising a roller/blade combination is developed by providing engineering solutions for the individual functions that should be supported and divided into doser/siever and recoater groups. Each group is compared via AHP to the widely - adopted in industry - benchmark mechanical PRS and superiority of the prototype is proven. The latter’s detail design is subsequently presented.
    Keywords: selective laser sintering; SLS; selective laser melting; SLM; powder deposition; analytic hierarchy process; AHP; recoater; doctor blade; roller.
    DOI: 10.1504/IJEDPO.2023.10059808
     
  • Optimal experimental designs for hypothesis testing with multiple factors: maximising power for the biological sciences   Order a copy of this article
    by Colin M. Lynch, Douglas C. Montgomery 
    Abstract: Biologists are facing mounting pressure to perform more complicated experiments with smaller budgets, but the main tool they use to design these experiments - power analyses - are often only calculated for a single factor. When an experiment includes multiple factors, then the spread of points among those factors influences power. Research into the design of experiments has uncovered many useful designs, but because they are not usually described in terms of power, they tend to be ignored by biologists. Here, to show the utility of these designs by calculating their power in two different experimental contexts. We find that various screening experiments provide comparable levels of power; however, they do so for differing numbers of factors. Definitive screening designs maintain high power levels for the largest number of factors. We also find that A-efficient designs (especially central composite designs) maximise power for experiments which characterise a nonlinear response surface.
    Keywords: power; experimental designs; hypothesis testing; classical designs; screening experiments; sample size.
    DOI: 10.1504/IJEDPO.2023.10061657
     

 

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