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  • Feb
    28

    SPREE Seminar- Nicholas Collins-Craft

    McCormick - Civil and Environmental Engineering (CEE)

    11:00 AM A230, Technological Institute

    EVENT DETAILS

    Title: Nonsmooth Mechanics For Fracture And Friction Problems In Geomaterials

    ABSTRACT: Modelling fracture propagation accurately and efficiently is a critical issue across a wide variety of engineering disciplines, not least in brittle materials such as rock masses or permafrost. Of the wide variety of modelling techniques, cohesive zone models are the most accurate, but are also correspondingly very numerically demanding. Intrinsic cohesive zone models are the most popular, but their initial elasticity leads to a range of non-physical behaviours that also cause severe numerical difficulties. While extrinsic cohesive zone models should avoid these behaviours, in practice almost all models exhibit the same pathologies as intrinsic models under complex loading such as impact by rockfalls. We use the techniques of nosmooth mechanics to formulate an extrinsic cohesive zone model for mode I (opening mode) cracks that avoids entirely the pathological behaviours under all loading conditions, while also including contact behaviour in the formulation. After re-framing this model in dynamics, we are able to write the system as a linear complementarity problem (LCP). We show that this LCP is well-posed for quite large time-steps, and we are able to benefit from the efficient solution algorithms developed for this class of problem. Some representative examples are explored with the model. We then briefly leave the problem of cohesion and focus on a problem of pure impact and Coulomb friction. The classical treatment of this is inconsistent (a fact known since the 1980s), and the Moreau–Jean scheme that discretises it can create energy during sliding. We present a treatment based on the work of M. Frémond, and demonstrate that this model is dissipative in both continuous and discrete time. We then return to the problem of cohesive fracture, this time for both mode I and mode II (sliding mode), while integrating contact and Coulomb friction. This model once again avoids the pathological behaviours characteristic of other models, and the dynamic formulation can be written as an LCP. We can show that the solution of this LCP exists, and once again benefit from the efficient solution algorithms to examine some representative examples. Finally, we examine some prospects for future extensions, the difficulties to overcome, and some applications to a variety of geomechanical problems.

    BIO: Nicholas Collins-Craft obtained his Bachelor of Engineering in Civil Engineering with First Class Honours and the University Medal from the University of Sydney in 2014. Starting in 2015, he undertook a joint PhD between the University of Sydney and École nationale des ponts et chaussées, supervised by Professors Itai Einav, Jean Sulem and Ioannis Stefanou, focused on the modelling of localisation in crushable granular media. This thesis was defended in November 2019. Following this, he undertook a postdoctoral period in the TRIPOP team at Inria Grenoble, working with Drs Vincent Acary and Franck Bourrier, adapting techniques from nonsmooth mechanics to the modelling of fracture. Since September 2022, he has been a Marie Sklodowska-Curie Actions postdoctoral fellow, on a joint project between Inria Grenoble and WSL/SLF Davos, working with Drs Vincent Acary and Franck Bourrier and Professor Johan Gaume, on the topic of climatechange induced gravitational hazards

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    TIME Wednesday, February 28, 2024 at 11:00 AM - 12:00 PM

    LOCATION A230, Technological Institute    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • Apr
    24

    SPREE Seminar Series - From Dots In Space To Space-Time-Magnitude Connections: Evolution of Energy Release Research As Applied to Damage Mechanics and Induced Seismicity- Jesse Hampton

    McCormick - Civil and Environmental Engineering (CEE)

    11:00 AM A236, Technological Institute

    EVENT DETAILS

    TIME Wednesday, April 24, 2024 at 11:00 AM - 12:00 PM

    LOCATION A236, Technological Institute    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • Apr
    26

    EES Seminar Series- Kaize Ding

    McCormick - Civil and Environmental Engineering (CEE)

    2:00 PM A236, Technological Institute

    EVENT DETAILS

    TIME Friday, April 26, 2024 at 2:00 PM - 3:00 PM

    LOCATION A236, Technological Institute    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • May
    1

    SPREE Seminar Series- Roman Makhenko

    McCormick - Civil and Environmental Engineering (CEE)

    11:00 AM A236, Technological Institute

    EVENT DETAILS

    TIME Wednesday, May 1, 2024 at 11:00 AM - 12:00 PM

    LOCATION A236, Technological Institute    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • May
    3

    EES Seminar Series- X-ray fluorescence microscopy for life and environmental studies at the Advanced Photon Source- Si Chen

    McCormick - Civil and Environmental Engineering (CEE)

    2:00 PM A236, Technological Institute

    EVENT DETAILS

    TIME Friday, May 3, 2024 at 2:00 PM - 3:00 PM

    LOCATION A236, Technological Institute    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • May
    6

    AED/MPM PD Seminar Series- Steve Nargang

    McCormick - Civil and Environmental Engineering (CEE)

    11:00 AM 1101, Pancoe-NSUHS Life Sciences Pavilion

    EVENT DETAILS

    TIME Monday, May 6, 2024 at 11:00 AM - 12:00 PM

    LOCATION 1101, Pancoe-NSUHS Life Sciences Pavilion    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • May
    8

    SPREE Seminar Series- Investigating Single & Multi-Component Polymer Grafted Nanoparticles using Molecular Modelling- Subhadeep Pal

    McCormick - Civil and Environmental Engineering (CEE)

    11:00 AM A236, Technological Institute

    EVENT DETAILS

    TIME Wednesday, May 8, 2024 at 11:00 AM - 12:00 PM

    LOCATION A236, Technological Institute    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • May
    8

    Extending Care: A Conversation about Conservation and Futurity

    Block Museum of Art

    6:00 PM Block Museum of Art, Mary and Leigh

    EVENT DETAILSmore info

    TIME Wednesday, May 8, 2024 at 6:00 PM - 7:30 PM

    LOCATION Block Museum of Art, Mary and Leigh    map it

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    CONTACT Block Museum of Art    block-museum@northwestern.edu EMAIL

    CALENDAR Block Museum of Art

  • May
    10

    EES Seminar Series- Phosphorous Recycling- Jade Basinski

    McCormick - Civil and Environmental Engineering (CEE)

    2:00 PM A236, Technological Institute

    EVENT DETAILS

    TIME Friday, May 10, 2024 at 2:00 PM - 3:00 PM

    LOCATION A236, Technological Institute    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • May
    13

    AED/MPM PD Seminar Series- Albert Mena & Maya Stuhlbarg

    McCormick - Civil and Environmental Engineering (CEE)

    11:00 AM 1101, Pancoe-NSUHS Life Sciences Pavilion

    EVENT DETAILS

    TIME Monday, May 13, 2024 at 11:00 AM - 12:00 PM

    LOCATION 1101, Pancoe-NSUHS Life Sciences Pavilion    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • May
    15

    SPREE Seminar Series- Understanding Heat Transport at Grain Boundaries Through High Resolution Imaging- Elenora Isotta

    McCormick - Civil and Environmental Engineering (CEE)

    11:00 AM A236, Technological Institute

    EVENT DETAILS

    TIME Wednesday, May 15, 2024 at 11:00 AM - 12:00 PM

    LOCATION A236, Technological Institute    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • May
    17

    EES Seminar Series- Dave Lampert

    McCormick - Civil and Environmental Engineering (CEE)

    2:00 PM A236, Technological Institute

    EVENT DETAILS

    TIME Friday, May 17, 2024 at 2:00 PM - 3:00 PM

    LOCATION A236, Technological Institute    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • May
    20

    AED/MPM PD Seminar Series- Andres Marulanda Escobar

    McCormick - Civil and Environmental Engineering (CEE)

    11:00 AM 1101, Pancoe-NSUHS Life Sciences Pavilion

    EVENT DETAILS

    TIME Monday, May 20, 2024 at 11:00 AM - 12:00 PM

    LOCATION 1101, Pancoe-NSUHS Life Sciences Pavilion    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • May
    22

    SPREE Seminar Series- Mechanism-Based Multi-Scale Models for Damage and Failure in Heterogeneous Materials- Kedar Kirane

    McCormick - Civil and Environmental Engineering (CEE)

    11:00 AM A236, Technological Institute

    EVENT DETAILS

    TIME Wednesday, May 22, 2024 at 11:00 AM - 12:00 PM

    LOCATION A236, Technological Institute    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • May
    24

    EES Seminar Series- PFAS Characterization- Gordon Getzinger

    McCormick - Civil and Environmental Engineering (CEE)

    2:00 PM A236, Technological Institute

    EVENT DETAILS

    TIME Friday, May 24, 2024 at 2:00 PM - 3:00 PM

    LOCATION A236, Technological Institute    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • Jun
    6

    CEE Department Graduation Recognition and Ceremony

    McCormick - Civil and Environmental Engineering (CEE)

    4:00 PM 1702 Chicago Ave

    EVENT DETAILS

    TIME Thursday, June 6, 2024 at 4:00 PM - 8:00 PM

    LOCATION 1702 Chicago Ave   

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • Jun
    7

    CEE Graduating Undergraduate Celebrating

    McCormick - Civil and Environmental Engineering (CEE)

    6:00 PM 623 W Howard St

    EVENT DETAILS

    TIME Friday, June 7, 2024 at 6:00 PM - 9:00 PM

    LOCATION 623 W Howard St   

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • Jun
    10

    Northwestern Engineering PhD Hooding and Master's Degree Recognition Ceremony

    McCormick School of Engineering and Applied Science

    9:00 AM Welsh-Ryan Arena

    EVENT DETAILSmore info

    TIME Monday, June 10, 2024 at 9:00 AM - 11:00 AM

    LOCATION Welsh-Ryan Arena   

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    CONTACT Amy Pokrass    amy.pokrass@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science

  • Jun
    10

    Northwestern Engineering Undergraduate Convocation

    McCormick School of Engineering and Applied Science

    2:00 PM Welsh-Ryan Arena

    EVENT DETAILSmore info

    TIME Monday, June 10, 2024 at 2:00 PM - 4:00 PM

    LOCATION Welsh-Ryan Arena   

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    CONTACT Amy Pokrass    amy.pokrass@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science