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  • 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

    Title: Mechanism-based multi-scale models for damage and failure in heterogeneous materials

    Abstract: A large variety of modern engineering materials such as polymers and their composites (unidirectional, textile, nanocomposites) have a heterogeneous microstructure. As a result, their failure behavior under multi-axial stresses is highly complex, consisting of multiple simultaneous meso-scale damage mechanisms. Moreover, the heterogeneous microstructure also makes the fracturing distinct quasi-brittle character (neither fully brittle nor fully ductile). This has important implications on structural behavior, especially in terms of size effects in strength and fracture toughness. Since structural designs often rely on numerical modeling, an accurate prediction of load-bearing capacities and energy dissipation during these failures is essential. This talk will focus on the class of semi-multiscale constitutive models called the microplane models (pioneered at Northwestern), which effectively address this challenge. These models have a dual-scale architecture, and can reproduce complex macro-scale behaviors via simple, intuitive formulation of meso-scale damage mechanisms. They also provide a physically sound basis to homogenize the meso-scale damage to predict the macro-scale failure growth and structural size effects. They are thus an effective strategy for multi-mechanism failures in heterogeneous materials. First, we will introduce the quintessential spherical microplane model, first developed for concrete, and applicable in general to isotropic materials. We will present its application to the failure of brittle-plastic polymers and demonstrate its abilities to capture complex aspects such as tension-compression asymmetry and pressure sensitivity. Next, we will introduce the cylindrical microplane model, which applies to unidirectionally reinforced polymer composites, which are transversely isotropic. We will present a successful application of this model to compression induced kink band failures. Following that we will introduce the microplane triad model, which applies to textile composites, which are orthotropic and have additional complexities due to yarn undulations. We will demonstrate its successful application to prediction of ballistic impact of woven composite lamina. Lastly, we will discuss the challenges of applying these models to real world applications and directions for future work.

    Bio- Prof. Kedar Kirane is an associate professor of Mechanical Engineering at Stony Brook University, New York. His research focuses on characterizing, understanding, and predicting the fracturing and scaling behavior of various conventional and advanced heterogeneous materials. These include brittle materials, fiber reinforced composites, polymers, nanocomposites, geological and cementitious materials, and soft materials. His research combines experimental, computational, and theoretical approaches. The overarching goal is to develop reliable predictive capabilities and sound scientific bases for safe designs in various engineering applications. Prof. Kirane obtained his Ph.D. in 2014 from Northwestern University and joined the Mechanical Engineering faculty at Stony Brook University in Sept 2017. He also holds an M.S. degree from the Ohio State University (2007) and a B.S from the University of Pune, India (2004), both in mechanical engineering. Prior to joining Stony Brook, Prof. Kirane worked in industry, as a finite element analyst at Goodyear Tire & Rubber Co and later as a senior research engineer at ExxonMobil Corp. His research is supported by DOD ARO, DOD ONR, NSF NRT, and ASME. He is the recipient of the 2020 Orr Early Career Award by ASME’s Materials Division, the 2019 DOD ARO Young Investigator Award, and the 2018 Haythornthwaite Research Initiation Grant by ASME’s Applied Mechanics Division.

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    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)

  • Aug
    14

    Undergraduate Quantum Summer School

    McCormick School of Engineering and Applied Science

    All Day Ford Motor Company Engineering Design Center

    EVENT DETAILSmore info

    TIME Wednesday, August 14, 2024

    LOCATION Ford Motor Company Engineering Design Center    map it

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    CONTACT Dongyang Li    lidongyang@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science

  • Aug
    15

    Undergraduate Quantum Summer School

    McCormick School of Engineering and Applied Science

    All Day Ford Motor Company Engineering Design Center

    EVENT DETAILSmore info

    TIME Thursday, August 15, 2024

    LOCATION Ford Motor Company Engineering Design Center    map it

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    CONTACT Dongyang Li    lidongyang@northwestern.edu EMAIL

    CALENDAR McCormick School of Engineering and Applied Science

  • Sep
    18

    CEE Faculty Retreat

    McCormick - Civil and Environmental Engineering (CEE)

    10:00 AM 1702 Chicago Ave

    EVENT DETAILS

    TIME Wednesday, September 18, 2024 at 10:00 AM - 4:00 PM

    LOCATION 1702 Chicago Ave   

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • Sep
    18

    CEE Department BBQ & Poster Session

    McCormick - Civil and Environmental Engineering (CEE)

    4:00 PM 225 Greenwood St

    EVENT DETAILS

    TIME Wednesday, September 18, 2024 at 4:00 PM - 6:00 PM

    LOCATION 225 Greenwood St   

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)

  • Sep
    20

    CEE New Student Orientation

    McCormick - Civil and Environmental Engineering (CEE)

    8:00 AM A230, Technological Institute

    EVENT DETAILS

    TIME Friday, September 20, 2024 at 8:00 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)

  • Sep
    24

    Fall 2024 Classes Begin

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Tuesday, September 24, 2024

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

    CALENDAR University Academic Calendar

  • Sep
    30

    Last day to add or change classes (Last day for tuition adjustment related to enrollment changes (to or from full-time). No reductions are made to bills for dropped or swapped classes after this date)

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Monday, September 30, 2024

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

    CALENDAR University Academic Calendar

  • Oct
    19

    CEE Fall Career Fair

    McCormick - Civil and Environmental Engineering (CEE)

    10:00 AM Louis Room, Norris University Center

    EVENT DETAILS

    TIME Saturday, October 19, 2024 at 10:00 AM - 1:00 PM

    LOCATION Louis Room, Norris University Center    map it

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    CONTACT Andrew Liguori    andrew.liguori@northwestern.edu EMAIL

    CALENDAR McCormick - Civil and Environmental Engineering (CEE)