BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Memento EPFL// BEGIN:VEVENT SUMMARY:MechE Colloquium: On the best compromise between strength\, ductil ity and fracture toughness in metallic alloys DTSTART:20221219T123000 DTEND:20221219T133000 DTSTAMP:20260317T110838Z UID:aaf251c91e5cdaa10332e654b4235ae694ca56fbbdc5224f5fc29652 CATEGORIES:Conferences - Seminars DESCRIPTION:Prof. Thomas Pardoen\, Institute of Mechanics\, Materials and Civil Engineering\, UCLouvain\nAbstract: The race for ultra-high strength in metallic alloys has turned into an even more complex quest for high str ength/high ductility balance over the last two decades. Depending on the l ist of requirements of the applications\, a minimum ductility is always ne eded at least for formability. More recently\, it has been recognized that a high strength / high ductility compromise does not necessarily translat e into high fracture toughness\, involving the remnant confusion between t he concepts of toughness and fracture toughness. A vast number of structur al applications calls for an optimum trade-off between fracture toughness\ , strength and ductility with a weight that depends on the type of loading conditions and constraints. This has brought back to the front scene the old question of the link between fracture toughness and the two other prop erties.\n\nIn the simplest paradigm\, fracture resistance expressed in ter ms of critical J integral JIc or critical energy release rate GIc is a pro duct of strength\, true fracture strain under the appropriate triaxiality and a microstructure length scale. The last aspect is often neglected as w ell as other contributors\, such as a possible change of failure mechanism at crack tip compared to tensile bars\, the resistance to void nucleation \, the strain hardening capacity and the thickness dependent dissipation b y crack tip necking in plates and sheets. Recent results on DP steels with elongated martensite second phases\, Cantor type high entropy alloy\, Ti- 12wt.% Mo alloy\, friction stir modified Al alloys and stainless steel\, w ill highlight several important messages on how to raise or to keep high f racture toughness in strong and ductile systems. \n\nBiography: Thomas Pa rdoen is full professor at the Ecole Polytechnique de Louvain and at the I nstitute of Mechanics\, Materials and Civil Engineering of UCLouvain. He i s the Senior Advisor to the President of UCLouvain for corporate relations . Outside UCLouvain\, he is the Chair of the Scientific Council of the Bel gian Nuclear Research Center SCK•CEN\, vice chair of the Board of the Vo n Karman Institute (VKi) and of the Board of the Centre Terre et Pierre (C TP). He represents Belgium at the Euratom Science and Technical Committee and at the Global Nuclear Forum (NEA/OECD). After graduating as engineer ( 1994)\, receiving a master in philosophy (1996) and a PhD (1998) at UCLouv ain\, and being a postdoctoral researcher at Harvard University\, he becam e faculty member in 2000. His research interests span the area of the nano -\, micro- and macro- mechanics of materials and systems\, with an emphasi s on multiscale experimental investigations and modelling of deformation a nd fracture phenomena\, as well as coupled functional-mechanical propertie s and irradiation effects\, from both fundamental and applied perspectives . His research activity is articulated around the mechanics of (i) composi tes\, hybrids\, multimaterials\, and adhesives\, (ii) thin films\, coating s and mems\, (iii) high performance metallic alloys. He has supervised >50 Ph. D. students and > 25 post docs. He is a member of the editorial advis ory board of J. Mech. Phys. Solids\, Engng. Fract. Mech and Int. J. Damage Mech. He has published over 230 papers in peer reviewed international jou rnals\, with current h factor = 66 (Google)\, and 4 patents. He received t he Grand Prix Alcan of the French academy of sciences in 2011 and a Francq ui Chair from Université de Liège in 2015. He has been nominated Euromec h Fellow in 2015. LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418 https://epf l.zoom.us/j/65387864766 STATUS:CONFIRMED END:VEVENT END:VCALENDAR