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WHEN AND WHERE
Tuesday, 9 April 2024 at 15h00
Venue MSG-024/025, Bernal Institute.
ABSTRACT
This seminar will discuss findings of interest to the University of Limerick (UL) engineering materials community from our ongoing work on the metal plasticity characterisation and modelling of additively manufactured (AM) steel and corrosion-impacted aluminium.
This talk will cover findings on the:
• Tensile properties of laser powder bed fusion (PBF) steel 316L pre and post annealing, for various build orientations. A look into the possible effect of powder recycling will also be discussed in relation to its impact on primary mechanical properties.
• Ratcheting (cyclic creep) response of material extrusion (MEX) steel 316L resulting from stress-controlled loading histories. Material manufactured via the MEX additive manufacturing method with the use of different raster angles and layer heights has been used for that purpose. The resulting ratcheting performance is discussed under the prism of the influence of these manufacturing parameters.
• Cyclic elastoplastic response of pre-corroded aluminium alloy 2024-T3, subjected to a variety of strain-controlled loading histories. The influence of corrosion exposure time is examined to evaluate the observed behaviour and low cycle fatigue (LCF) performance of the material.
ABOUT THE PRESENTER
Kyriakos I. Kourousis is an Associate Professor in the School of Engineering of the University of Limerick (UL). His primary research expertise is in the area of metal plasticity of conventional and additively manufactured (AM) metals (i.e. Ti-6A-4V, steel 316L, aluminium 7075/2024), working on constitutive modelling and characterisation of their mechanical behaviour under complex loading histories. The cyclic plasticity models he has developed have also been employed successfully within fatigue calculation codes, for the purposes of in-service fatigue monitoring of a military aircraft fleet in Australia. Kyriakos has established the metal AM research activity in UL, by receiving in 2018 an award from GE Additive for a high-value laser powder bed fusion system (PBF). This system is operated under a partnership agreement he has set up with Croom Medical. He also conducts research in the airworthiness field, with a focus on safety management and military aviation regulations. He completed his PhD at the National Technical University of Athens (NTUA) in 2011, under the supervision of Professor Yannis F. Dafalias of NTUA & UC Davis. He has a Master’s in Computational Mechanics of solids from NTUA (2003) and a BSc (Hons) in Aeronautical Engineering from the Hellenic Air Force Academy (2000). His professional background includes 11 years of practice as Aeronautical Engineer Officer (Major ret.) of the Hellenic Air Force, with expertise in aircraft structural integrity and airworthiness management of the Dassault Aviation Mirage 2000.