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SUMMARY:MICDE Seminar: Michael Shelley\, Courant Institute\, New York University
DESCRIPTION:Bio: Michael J. Shelley is an American applied mathematician who works on the modeling and simulation of complex systems arising in physics and biology. He holds a BA in Mathematics from the University of Colorado (1981) and a PhD in Applied Mathematics from the University of Arizona (1985). He was a postdoctoral researcher at Princeton University\, and then joined the faculty of mathematics at the University of Chicago. In 1992 he joined the Courant Institute of Mathematical Sciences at New York University where he is the George and Lilian Lyttle Professor of Applied Mathematics. He is also a Professor of Neuroscience (NYU) and Professor of Mechanical Engineering (NYU-Poly). \nProfessor Shelley’s work includes free-boundary problems in fluids and materials science\, singularity formation in partial differential equations\, modeling visual perception in the primary visual cortex\, dynamics of complex and active fluids\, cellular biophysics\, and fluid-structure interaction problems such as the flapping of flags\, stream-lining in nature\, and flapping flight. He is also the co-founder and co-director of the Courant Institute’s Applied Mathematics Lab. \nSource https://en.wikipedia.org/wiki/Michael_Shelley_(mathematician) \nModeling and Simulating Active Mechanics in the Cell\nMany fundamental phenomena in eukaryotic cells — nuclear migration\, spindle positioning\, chromosome segregation — involve the interaction of (often transitory) cellular structures with boundaries and fluids. Understanding the consequences of these interactions require specialized numerical methods for their large-scale simulation\, as well as mathematical modeling and analysis. In this context\, I will discuss the recent interactions of mathematical modeling and large-scale\, detailed simulations with experimental measurements of activity-driven Biomechanical processes within the cell.
URL:https://micde.umich.edu/event/micde-seminar-michael-shelley-courant-institute-new-york-university/
LOCATION:1084 East Hall\, 530 Church St.\, Ann Arbor\, MI\, 48109\, United States
CATEGORIES:MICDE Seminar Series
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SUMMARY:MICDE Seminar: Michael Falk\, Department of Materials Science and Engineering\, Johns Hopkins University
DESCRIPTION:Bio: Michael Falk is a professor of Materials Science and Engineering at Johns Hopkins University where he also serves as the Vice Dean for Undergraduate Education. He holds a bachelor’s degree in physics and a master’s degree in Computer Science from Johns Hopkins. He completed his Ph.D. in physics at the University of California\, Santa Barbara and then launched his academic career as a computational materials scientist at the University of Michigan in 2000. In 2008 he returned to Johns Hopkins as an associate professor of Materials Science and Engineering with joint appointments in Mechanical Engineering and Physics. Prof. Falk’s research focuses on utilizing computer simulation on the atomic scale to understand the processes by which materials are pushed out of equilibrium by processes such as bending\, breaking\, charging and undergoing frictional sliding. His research has had an abiding focus on the ways glass structures accommodate plastic flow\, deformation and fracture. These investigations have involved developing new methodologies for deploying molecular dynamics simulations and the development of thermodynamically motivated constitutive theories. Prof. Falk also engages in educational research and is a strong advocate for diversity and inclusion\, engaging in outreach to Baltimore City elementary schools and advocating for a welcoming climate for LGBTQ people within the engineering and physics professions. \nConnecting atomistic simulations\, defect-based theories and continuum plasticity in amorphous solids\nGlasses\, and the more general category of materials known as amorphous solids\, lack crystal structure and find wide application from consumer goods to photovoltaics. Yet\, issues quantifying disorder have stymied the construction of physically grounded mechanical constitutive laws for these materials suitable for failure prediction. Atomistic simulation methods can provide some insight regarding the mechanisms of plastic deformation and strain localization. Recent investigations have aimed at quantifying the defects that control plastic flow by quantifying a yield stress field at the nanometer scale. Analysis of these fields have confirmed some of the assumptions built into the shear transformation zone theory of amorphous plasticity\, most notably the orientational nature of the defect and their pre-existence in the structure. I will further discuss methods for quantitatively predicting strain localization\, a limiting failure process in high-strength metallic glasses and other amorphous materials by parameterizing the effective-temperature shear transformation zone theory from molecular dynamics simulations. We have directly cross-compared molecular dynamics simulations and continuum representations of these same materials in order to test and validate our constitutive theories. The role of coarse graining in the linkage of continuum and atomistic methods is crucial\, and convergence only arises above a critical length scale on the order of tens of angstroms. The investigation makes clear the need to separate out the relevant fluctuations in material structure from the shorter wavelength fluctuations that serve to obscure them. It is\, in the end\, the interactions between these larger-scale relevant fluctuations via the material’s mechanical response that controls the failure process during strain localization. \nProf. Falk is being hosted by Prof. Yue Fan (Mechanical Engineering). If you would like to meet him during his visit please email micde-contact@umich.edu
URL:https://micde.umich.edu/event/micde-seminar-michael-falk-hopkins/
LOCATION:1303 EECS\, 1301 Beal Ave\, Ann Arbor\, MI\, 48109\, United States
CATEGORIES:Featured Events,MICDE Seminar Series
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