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Venue MSG-024/025, Bernal Institute.
ABSTRACT
Additive Manufacturing (AM) has rapidly grown in popularity in recent years due to the availability of low-cost approaches such as Fused Deposition Modelling (FDM). AM has also become popular for the manufacture of biomedical parts using titanium alloys (predominantly Ti6Al4V) and for jet engine parts using alloys such as IN718. FDM is the most popular AM technique as it allows the production of bespoke, complex parts from a variety of polymeric materials in a range of environments from the home office to industrial settings. In AM, parts are built up of successive layers of material by adding semi-molten or molten material on top of existing layers. Parts are constrained by their adherence to a build plate which leads to tensile stress magnitudes at the interface as the material cools and contracts. As each layer is added to a part, the previous layers are heated and then cool towards ambient temperature. This heating and cooling process results in thermal expansion and contraction causing the development of a complex residual stress distribution which can cause parts to distort unpredictably on the print bed, potentially leading to failed prints through delamination and cracking, and due to the print head colliding with the part. This presentation will look at the opportunity to predict residual stress and distortion in polymer and metal AM parts using the finite element method through analysis of some case studies.
ABOUT THE PRESENTER
David Tanner is a Professor in Manufacturing Process Technology at the University of Limerick. He undertakes engineering research in the areas of finite element analysis of metal working processes, additive manufacturing, and investment casting as a member of the faculty’s Bernal Institute. Professor Tanner has been an active member of the CDIO initiative in engineering education since 2009 and has developed engineering modules based on the principles of CDIO. He has published over 75 peer reviewed journal articles from both engineering and engineering education research.
For further information, please contact edmond.magner@ul.ie