News & EventsDepartment Events
Events
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Oct7
EVENT DETAILS
lessFaults that accommodate earthquakes are often embedded in hundreds-meter-thick fractured rocks, i.e., fault damage zones. The San Andreas fault, for example, is surrounded by a 150–200 m wide fault damage zone with 30–40% seismic wave reductions. Because such major faults can host M7 earthquakes that cause strong ground shaking in nearby populated regions, it is essential to understand how earthquakes grow in fault damage zones and whether their source properties and ground motions are strongly modulated by the fractured rocks. My talk will demonstrate how seismic waves in damage zones can profoundly affect how fast earthquakes grow and how quickly slip arrests on the fault in dynamic rupture simulations. I will also discuss the theoretical prediction that earthquakes in damage zones can rupture faster than the shear wave speeds of host rocks. Such supershear rupture can propagate stably at a range of speeds usually considered as unstable and cause large ground motions at long distances.
TIME Wednesday, October 7, 2026 at 11:00 AM - 12:00 PM
LOCATION A230, Technological Institute map it
CONTACT Logan Hart logan.hart@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Oct8
EVENT DETAILS
lessThe constitutive framework documented in served as the basis for various structural models in the context of fiber-reinforced composites. By accounting for the microstructure, it also formed the foundation for the mechanical analysis of a wide range of soft biological tissues—including arteries in both healthy and pathological states, myocardium, heart valves, corneas, lens capsules, ligaments, skin, cartilage, temporomandibular joint discs, and intervertebral discs, to name but a few. This constitutive framework is also employed to describe the mechanical behavior of engineered materials, such as textile composites, as well as anisotropic hyperelastic solids in general. Given that collagen fiber orientation in many soft biological tissues exhibits a certain degree of dispersion, we have extended our model to include two additional scalar structural parameters that characterize the asymmetric distribution of collagen fiber orientation.
This lecture summarizes the development of a structural model and focuses on the challenges associated with modeling soft biological tissues—such as arterial walls and the myocardium—in health and disease, e.g., in cases of aortic dissection. In particular, a patient-specific computational model of aortic dissection is presented that accounts for fluid-structure interaction and enables a better understanding of system behavior in response to specific parameter changes.
TIME Thursday, October 8, 2026 at 11:00 AM - 12:00 PM
LOCATION A230, Technological Institute map it
CONTACT Ezri Alfie ezri.alfie@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Oct9
EVENT DETAILS
lessRecent Developments Using DIC Measurements and Advance Algorithms for Material Characterization
TIME Friday, October 9, 2026 at 11:00 AM - 12:00 PM
LOCATION Hive, Ford Motor Company Engineering Design Center map it
CONTACT Ezri Alfie ezri.alfie@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Oct14
EVENT DETAILS
lessPatterns in Porous Media
TIME Wednesday, October 14, 2026 at 11:00 AM - 12:00 PM
LOCATION A230, Technological Institute map it
CONTACT Charles Martell charles.martell1@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Oct16
EVENT DETAILS
lessABSTRACT: Pathogenic viruses are responsible for the majority of infectious disease risk from sewage-contaminated water, yet our current monitoring systems were not designed to detect them. Regulatory frameworks rely on bacterial indicators that poorly predict viral risk, and direct viral detection at health-relevant concentrations remains technically challenging given the extraordinary diversity of human viral pathogens. This talk presents our group's work developing quantitative viral metagenomic approaches and identifying robust novel viral indicators for environmental waters, and discusses how this work connects to wastewater-based epidemiology, showing how the same molecular tools that improve water quality monitoring can enable real-time tracking of community disease dynamics as demonstrated during COVID-19 and beyond. I will close with a perspective on how quantitative viral surveillance will reshape both water safety regulations and proactive public health intervention.
BIO: Kyle Bibby, PhD, PE, BCEE is the Keating-Crawford Collegiate Professor of Civil and Environmental Engineering and Earth Sciences at the University of Notre Dame, where he also serves as Director of the ECI Water Initiative. His research group focuses on molecular tools for environmental pathogen detection, novel fecal indicator development, and wastewater-based epidemiology. His work has been recognized with an NSF CAREER Award, the 2025 AAEES University Research Grand Prize, and Clarivate Highly Cited Researcher designation in 2023 and 2025. He currently serves on the WHO roster of experts updating the global drinking water quality guidelines.
TIME Friday, October 16, 2026 at 2:00 PM - 3:00 PM
LOCATION A230, Technological Institute map it
CONTACT Charles Martell charles.martell1@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Oct16
EVENT DETAILS
lessMolecular Tools for Water Quality and Public Health Surveillance
TIME Friday, October 16, 2026 at 2:00 PM - 3:00 PM
LOCATION A230, Technological Institute map it
CONTACT Charles Martell charles.martell1@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Oct22
EVENT DETAILS
lessThe maximum stress and displacement in a cylindrical bar subjected to impact by a dropped weight are determined for linearly elastic, elastoplastic (metallic), and hyperelastic (rubber-like) materials. Both tensile and compressive impacts are considered for different impact velocities. The analysis is based on an extension of the classical energy approach of infinitesimal linear elasticity. It is assumed that the work done on the bar by the falling weight is equal to its initial kinetic energy plus the change in its gravitational potential energy, evaluated with respect to the deformed configuration of the bar when the velocity of the dropped weight becomes zero. The mass of the impacted bar is assumed to be much smaller than that of the falling weight, so that the inertia of the bar and wave-propagation effects can be neglected.
After reviewing the classical analysis for linear elasticity, the approach is extended to a bilinear elastoplastic material model and subsequently to the nonlinear Ramberg–Osgood, Ludwik, and Rasmussen material models. For tensile impact, the threshold velocity for the onset of necking is determined as a function of the mass, material, and geometric properties of the bar, assuming that the impact velocity is sufficiently low that strain-rate effects can be neglected. For compressive impact of slender bars, the buckling stress and corresponding critical impact velocity are determined using Engesser's tangent-modulus theory and von Kármán's reduced-modulus theory.
The analysis is then extended to incompressible rubber-like materials described by the Mooney–Rivlin, neo-Hookean, Gent, Yeoh, Ogden, and Arruda–Boyce hyperelasticity models, as well as to compressible foam-like materials described by the Blatz–Ko, Hill–Storäkers, and compressible neo-Hookean models. Other coupled and uncoupled compressible hyperelastic models are also considered and discussed. For a linearly elastic bar, the maximum stress at zero impact velocity is twice the corresponding static stress. For nonlinear bars the dynamic factor can differ substantially from 2, depending on the magnitude of the dropped weight and the degree and type of material nonlinearity.
The seminar will address both the research and teaching aspects of this mechanics problem, including energy considerations, wave propagation, material nonlinearity, instability, and constitutive modeling.TIME Thursday, October 22, 2026 at 11:00 AM - 11:00 PM
LOCATION B211, Technological Institute map it
CONTACT Ezri Alfie ezri.alfie@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Oct23
EVENT DETAILS
lessEpigenetics, Biological Aging, and Epidemiology
TIME Friday, October 23, 2026 at 2:00 PM - 3:00 PM
LOCATION A230, Technological Institute map it
CONTACT Logan Hart logan.hart@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Nov4
EVENT DETAILS
lessOn the Role of Large Language Models and Agents from the Scientific Record to Certified Mechanics and Our Classrooms
TIME Wednesday, November 4, 2026 at 11:00 AM - 12:00 PM
LOCATION A230, Technological Institute map it
CONTACT Logan Hart logan.hart@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Nov6
EVENT DETAILS
lessHow the exposome in infancy influences trajectories of chronic inflammation, aging, and disease
TIME Friday, November 6, 2026 at 2:00 PM - 3:00 PM
LOCATION A230, Technological Institute map it
CONTACT Logan Hart logan.hart@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Nov11
EVENT DETAILS
lessCould we use instabilities instead of avoiding them? Mechanical instabilities are usually seen as failure modes. However, recent work shows they can instead be harnessed to give structures rapid, switchable, and adaptive behaviors. Snapping instabilities, for example, allow sudden transitions between stable shapes. In this talk, I introduce countersnapping, a new type of snapping instability in which a structure becomes stronger and stiffer as it snaps, giving rise to programmable stiffness, tunable natural frequency, and hinting toward the possibility of domino-like wave propagation. I will discuss some avenues on how mechanical instabilities could be used to reach structural adaptability using propagation waves.
TIME Wednesday, November 11, 2026 at 11:00 AM - 12:00 PM
LOCATION A230, Technological Institute map it
CONTACT Logan Hart logan.hart@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Nov13
EVENT DETAILS
lessManagement of powerline corridors affects biodiversity and provision of ecosystem services in the Chicago metropolitan region
TIME Friday, November 13, 2026 at 2:00 PM - 3:00 PM
LOCATION A230, Technological Institute map it
CONTACT Logan Hart logan.hart@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Nov18
EVENT DETAILS
lessPermeability is a key property governing fluid transport in geomaterials and plays an important role in subsurface energy technologies such as deep geothermal stimulation, geological CO₂ sequestration, and hydrogen storage. In low-permeability rocks, however, conventional permeability measurements such as the classical transient pulse-decay test can take days, making rapid and reliable characterization challenging. This research seeks to infer permeability from the early-time portion of transient pressure measurements using the Integral-Balance Method. The early-time pressure distribution within the rock specimen is first represented by an assumed profile function, and global mass conservation will be then enforced by integrating the governing equations over the evolving difusion front. This technique reduces the original system of partial differential equations describing the test to a system of ordinary differential equations, leading to a robust regression procedure for determining rock permeability from early-time pressure data. A laboratory test using Vermont serpentinite successfully validated the method. Further extension of the framework to field-scale diagnostic tests, such as pressure fall-off test, will also be discussed.
TIME Wednesday, November 18, 2026 at 11:00 AM - 12:00 PM
LOCATION A230, Technological Institute map it
CONTACT Ezri Alfie ezri.alfie@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Nov19
EVENT DETAILS
lessHow precisely can we measure and control the motion of an object? Quantum mechanics gives a famously unsettling answer: the act of measurement inevitably disturbs the motion we seek to measure — this is the famous uncertainty principle of Heisenberg, theorized almost exactly 100 years ago. I will describe recent experiments that approach these limits using tangibly macroscopic mechanical oscillators, including the measurement and quantum control of motion of a kilogram-scale mirror, and of a centimeter-scale torsional oscillator. At these scales, quantum mechanics becomes a theory we can test with objects we can see and weigh—opening the possibility of asking whether quantum mechanics survives unchanged in the macroscopic world, and ultimately whether gravity itself must obey quantum rules, one of the pre-eminent problems of modern physics.
TIME Thursday, November 19, 2026 at 10:00 AM - 12:00 PM
LOCATION A230, Technological Institute map it
CONTACT Ezri Alfie ezri.alfie@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)
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Nov20
EVENT DETAILS
lessInvestigating Stream Connectivity and Water Quality Across Space and Time
TIME Friday, November 20, 2026 at 2:00 PM - 3:00 PM
LOCATION A230, Technological Institute map it
CONTACT Logan Hart logan.hart@northwestern.edu EMAIL
CALENDAR McCormick - Civil and Environmental Engineering (CEE)