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A Path Towards Understanding of Multiscale and Evolving Material Structure-Properties-Behavior Relationships

Friday, February 9, 2018, 11:00 AM
Nedderman Hall 108

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Dr. Antonios KontsosAbstract

Two recent science and technology developments allow a renewed viewpoint in understanding of material structure-properties-behavior relationships, which are in general challenging due to the several time and length scales as well as coupling effects that they involve. First, the widespread use of modern material characterization equipment capable to monitor the structure of matter and reveal effects in almost real time. The second relates to the development of testing tools coupled with novel computational methods that are capable to use the spatial and temporal degrees of freedom required when investigating material behavior. In this context, this talk will attempt to demonstrate that classical structure-properties-behavior topics such as the ones involving plastic deformation can now be revisited with the intend to better understand both physically and mechanistically relationships between material structure and evolving multiscale behavior. To demonstrate some aspects of this “new era” a particular example is chosen that investigates the role of twinning activity in Magnesium alloys which is associated with both micro- and macroplasticity effects such as plastic anisotropy, tension-compression asymmetry and unusual fatigue hysteresis loops. The results presented will show how a macroscopically observable feature that involves shear band-like formations was used to set up a testing, characterization and computational modeling campaign that ultimately targets, besides fundamental understanding, ideas on how to perform more efficient material design. Extensions of this path are presented and discussed in the context of advanced manufacturing which is posed to change the way next generation materials are made.

Bio

Dr. Antonios Kontsos is an Associate Professor in the Mechanical Engineering & Mechanics Department at Drexel University and he is currently the Director of the Theoretical and Applied Mechanics Group (TAMG). He received his undergraduate 5-year Diploma (2002) in Mechanical Engineering & Aeronautics from University of Patras (Greece), and his M.S (2005) and Ph.D. (2007) degrees in Mechanical Engineering & Materials Science from Rice University (Houston, TX). Before joining Drexel in 2009, Dr. Kontsos held a post-doc position at the Center for Mechanics of Solids, Structures and Materials in the Aerospace Engineering & Engineering Mechanics Department at the University of Texas at Austin (Austin, TX). Dr. Kontsos’s primary research interest is in the theoretical, experimental and computational investigation of the mechanical behavior of materials with emphasis on understanding of evolving microstructure-properties-behavior relationships.

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