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  • Apr
    8

    CANCELLED - SPREE Seminar: Marco Amabili

    McCormick - Civil and Environmental Engineering

    11:00 AM A230, Technological Institute

    EVENT DETAILS

    NONLINEAR VIBRATIONS OF SHELLS: FROM CLASSICAL PROBLEMS TO SOFT BIOLOGICAL MATTER

    Abstract

    This seminar will focus on nonlinear vibrations of shells made of traditional, composite, and soft biological materials. Starting from classical nonlinear shell theories, nonlinear dynamic phenomena that can be observed in circular cylindrical shells will be highlighted: from softening behavior to amplitude modulations, internal resonance and chaos. Then, in order to deal with thick walls and large strains associated to soft materials, the classical shell theories are modified by including shear and thickness deformations, as well as rotary inertia. Comparison of numerical simulations and experiments for large amplitude (geometrically nonlinear) vibrations of plates and shell structures will be presented and the very large increase of damping with the vibration amplitude will be discussed. This is a little-known phenomenon of fundamental importance in applications. The nonlinear damping will be derived in a very original way from viscoelasticity. The damping model obtained is geometrically nonlinear and the parameters are identified from experiments. Numerical results are compared to experimental forced vibration responses measured for large-amplitude vibrations of different structural elements.

    Biological soft tissues are subjected to significant static and dynamic loading, yielding large strains that requires the introduction of hyperelastic and viscoelastic constitutive models. Results for human aortas will be shown and compared to experiments obtained on a mock circulatory loop.

    Bio

    Prof Amabili holds the Canada Research Chair in Vibrations and Fluid-Structure Interaction at McGill University in Montreal. He is the author of the monographs Nonlinear Vibrations and Stability of Shells and Plates and Nonlinear Mechanics of Shells and Plates in Composite, Soft and Biological Materials, both published by Cambridge University Press. He is the author of over 460 papers, 210 of which are published in international journals, including Nature Communications, with over 10,000 citations. He is an elected Fellow of the Canadian Academy of Engineering and an elected member of the European Academy of Sciences and Arts. He was selected to deliver the 2019 Koiter lecture of the Dutch research school on Engineering Mechanics; the Koiter lecture honors researchers who have made profound contributions to the field of Engineering Mechanics, and it has a rich history. He is the Secretary of the Executive Committee of the Applied Mechanics Division of the American Society of Mechanical Engineers and the chair of the Canadian Committee for IUTAM. He received the Christophe Pierre Research Excellence Award by McGill University in 2015. Among other editorial appointments, he is the Contributing Editor of the International Journal of Non-linear Mechanics (Elsevier) and Associate Editor of Journal of Fluids and Structures (Elsevier).

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    TIME Wednesday, April 8, 2020 at 11:00 AM - 12:00 PM

    LOCATION A230, Technological Institute    map it

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    CONTACT Tierney Acott    tierney-acott@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering

  • Apr
    8

    CANCELLED - Northwestern Sustainability Lecture Series

    McCormick - Civil and Environmental Engineering

    9:00 AM Norris University Center

    EVENT DETAILSmore info

    TIME Wednesday, April 8, 2020 at 9:00 AM - 4:30 PM

    LOCATION Norris University Center    map it

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    CONTACT Alison Rodriguez    alison.rodriguez@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering

  • Apr
    15

    CANCELLED - 2nd Annual High School Nanoscience Hands-on Workshop

    McCormick - Civil and Environmental Engineering

    8:30 AM A230, Technological Institute

    EVENT DETAILS

    TIME Wednesday, April 15, 2020 at 8:30 AM - 2:00 PM

    LOCATION A230, Technological Institute    map it

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    CONTACT Alison Rodriguez    alison.rodriguez@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering

  • Apr
    17

    PhD Defense: Paul Roots

    McCormick - Civil and Environmental Engineering

    12:30 PM

    EVENT DETAILS

    TIME Friday, April 17, 2020 at 12:30 PM - 1:30 PM

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    CONTACT Tierney Acott    tierney-acott@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering

  • Apr
    29

    CANCELLED - SPREE Seminar: Oluwaseyi Balogun

    McCormick - Civil and Environmental Engineering

    11:00 AM A230, Technological Institute

    EVENT DETAILS

    TIME Wednesday, April 29, 2020 at 11:00 AM - 12:00 PM

    LOCATION A230, Technological Institute    map it

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    CONTACT Tierney Acott    tierney-acott@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering

  • May
    8

    CANCELLED - EES Seminar: Chris Marshall

    McCormick - Civil and Environmental Engineering

    2:00 PM A230, Technological Institute

    EVENT DETAILS

    TIME Friday, May 8, 2020 at 2:00 PM - 3:00 PM

    LOCATION A230, Technological Institute    map it

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    CONTACT Tierney Acott    tierney-acott@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering

  • May
    25

    Memorial Day (no classes)

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Monday, May 25, 2020

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Jun
    19

    Commencement

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Friday, June 19, 2020

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Jun
    19

    McCormick PhD Hooding Ceremony

    McCormick School of Engineering and Applied Science

    2:00 PM Ryan Family Auditorium, Technological Institute

    EVENT DETAILS

    TIME Friday, June 19, 2020 at 2:00 PM - 3:30 PM

    LOCATION Ryan Family Auditorium, Technological Institute    map it

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    CONTACT Northwestern Engineering Events    northwestern-engineering-events@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science