The Lindbergh Lectures | ME 903 Graduate Seminar

All first-year graduate students in the Department of Mechanical Engineering participate in this seminar series during their first two semesters.

The Lindbergh Lectures, named for the aviation pioneer Charles Lindbergh x’24, are presented by our faculty for our graduate students and colleagues in the College of Engineering.

Typically taking place on alternate Thursdays, the Lindbergh Lectures bring stellar researchers from universities, government research labs, and industry to discuss their recent work.

View upcoming Lindbergh Lectures on the UW events calendar

Fall 2019

September 12, 2019
Prof. Alison Marsden
Stanford University
Departments of Pediatrics and Bioengineering, and by courtesy of Mechanical Engineering
Institute for Computational and Mathematical Engineering
Vera Moulton Wall Center Faculty Scholar

video of lecture  (requires CAE login from College of Engineering)

Computational modeling of coronary artery hemodynamics for personalized medicine in children and adults

Cardiovascular disease is the leading cause of death worldwide, with nearly 1 in 4 deaths caused by heart disease alone. In children, congenital heart disease affects 1 in 100 infants, and is the leading cause of infant mortality in the United States.

Patient-specific modeling based on medical image data increasingly enables personalized medicine and individualized treatment planning in cardiovascular disease patients, providing key links between the mechanical environment and subsequent disease progression.

I will discuss recent methodological advances in cardiovascular simulations that aim to increase rigor and clinically applicability, including:

  1. development of a complete pipeline from clinical data assimilation to uncertainty quantification in patient-specific simulations, and
  2. novel methods for fluid structure interaction with fully incompressible tissue properties and incorporating wall mechanobiology.

Clinical application of these methods will be demonstrated in two applications of patient-specific modeling in the coronary arteries:

  1. coronary bypass graft surgery and the biomechanics of vein graft failure, and
  2. risk stratification in pediatric patients with Kawasaki disease.

We will provide an overview of our open source SimVascular project, which makes our tools available to the scientific community (simvascular.org). Finally, I will discuss future directions in fluid solid growth simulations and whole-heart modeling, challenges of translating modeling tools to the clinic, and applications to a range of adult and pediatric cardiovascular diseases.

Prof. Alison MarsdenProf. Alison Marsden is an associate professor in the departments of Pediatrics, Bioengineering, and, by courtesy, Mechanical Engineering at Stanford University. She is a member of the Institute for Mathematical and Computational Engineering. From 2007 to 2015 she was a faculty member in Mechanical and Aerospace Engineering at UCSD. She graduated with a BSE degree in Mechanical Engineering from Princeton University in 1998, and a PhD in Mechanical Engineering from Stanford in 2005. She was a postdoctoral fellow at Stanford University in Bioengineering from 2005 to 2007. She was the recipient of a Burroughs Wellcome Fund Career Award at the Scientific Interface in 2007, an NSF CAREER award in 2011, and was elected as a fellow of AIMBE and SIAM in 2018. She has published over 100 peer reviewed journal papers and serves on the editorial board of several journals. Her research focuses on the development of numerical methods for cardiovascular blood flow simulation and application of engineering tools to impact patient care in cardiovascular surgery and congenital heart disease.


September 19, 2019
Mark Tschopp
U.S. Army Research Laboratory—Central
Regional Lead

video of lecture  (requires CAE login from College of Engineering)

ARL Central, polycrystalline materials by design, and other short stories

This talk will briefly discuss the U.S. Army Research Laboratory and its recent venture into the Midwest region, termed ARL Central. ARL Central is designed to work with partners to jointly solve the Army’s future technology needs by plugging into the talented Midwest ecosystem. Then, on to research…

Grain boundaries and interfaces play a commanding role in the bulk properties of polycrystalline materials, interacting with dislocations and/or cracks, absorbing defects and solute atoms, and moving with stress and/or temperature. Understanding the structure-property relationships of grain boundaries and interfaces in metals and ceramics is critical to designing material systems for improved properties and performance.

This presentation will introduce the different kinds of grain boundaries and interfaces in metals/ceramics and discuss some recent research thrusts to understand grain boundary/interfacial behavior, to model these grain boundaries/interfaces, and to experimentally tailor these grain boundaries/interfaces for real material systems.

The understanding of interfaces, in particular the structure-property relationships, is a key component of the “Materials-By-Design” thrust—a concept related to national initiatives to develop integrated computational material models that aim to link chemistry and processing all the way to performance, with everything in between. The ability to model these interfaces can provide insight into material behavior at multiple scales. This talk will focus on the many efforts to understand, model, and engineer grain boundaries in polycrystalline metals and ceramics, to include efforts to:

  1. sample how properties are influenced by grain boundary character;
  2. develop methods to obtain grain boundaries in simple (cubic) and complex systems;
  3. understand how grain boundary structure interacts with dislocations, point defects, solutes, and impurities;
  4. mathematically describe how shear (twinning dislocations) and shuffles impact twinning in HCP metals;
  5. engineer the thermal stability of nanocrystalline alloys via solute additions;
  6. radically improve the properties of bulk nanocrystalline parts by dispersing nanosized precipitates; and
  7. navigate the complexity in modeling grain boundaries in lightweight armor ceramics such as boron carbide.

Mark A. Tchopp is the Regional Lead for ARL Central at the U.S. Army Research Laboratory, having previously been a materials engineer, team leader, and branch chief in the Weapons and Materials Research Directorate. In this role, his mission is to accelerate discovery, innovation, and transition of science and technology to the Army through forging strategic regional partnerships via the Army’s Open Campus Initiative, and to capitalize on strong academic institutions by leveraging the talent ecosystem for ARL within the Midwest. Tschopp received his BS and MS degrees in Metallurgical Engineering from the Missouri University of Science and Technology. Before joining ARL in 2012, he spent four years in experimental manufacturing research, development, and validation at GM Powertrain, two years in high-temperature material sustainability and mechanics within the Life Prediction and Behavior group at the Air Force Research Laboratory, and over four years as research faculty in the Center for Advanced Vehicular Systems at Mississippi State University with appointments in Mechanical Engineering and Computational Science & Engineering. He received the Mississippi State Pride Faculty Award for excellence in research, teaching, and service to Mississippi State University. Tschopp’s primary research focus has been accelerated design of materials using a combination of modeling and simulation, data science, machine learning, and design optimization. He has published over 160 journal papers, book chapters, conference papers, and technical reports with over 3500 citations for the 100+ peer reviewed journal papers in materials science, mechanics, computational science, and design (Google Scholar, h-factor of 34). He has presented over 130 presentations and seminars at national and international conferences, including giving over 100 invited talks/seminars. He received the ASM Silver Medal Award from ASM International in 2016, the distinction of Fellow of ASME in 2017, and the distinction of Fellow of ASM International in 2018.


September 26, 2019
Prof. Kaushik Bhattacharya
California Institute of Technology
Howell N. Tyson, Sr., Professor of Mechanics and Professor of Materials Science
Vice-Provost

video of lecture (requires CAE login from College of Engineering)

Liquid crystal elastomers

Liquid crystal elastomers are rubbery solids with liquid crystal mesogens incorporated into their main chains. They display an isotropic to nematic phase transformation accompanied by a large spontaneous deformation. This in turn leads to rich variety of phenomena including ultra-soft behavior, stripe domains, shape-morphing etc. Further, when made as slender structures, the structural instability of slender structures and the material instabilities of liquid crystal elastomers combine and compete in interesting ways. This talk will provide an introduction to these materials and provide examples from contemporary research about opportunities these materials present.

Prof. Kaushik BhattacharyaProf. Kaushik Bhattacharya is Howell N. Tyson, Sr., Professor of Mechanics and Professor of Materials Science as well as the Vice-Provost at the California Institute of Technology. He received his B.Tech degree from the Indian Institute of Technology, Madras, India in 1986, his Ph.D from the University of Minnesota in 1991, and his post-doctoral training at the Courant Institute for Mathematical Sciences in 1991 to 1993. He joined Caltech in 1993. His research concerns the mechanical behavior of solids, and specifically uses theory to guide the development of new materials. His honors include the Distinguished Alumni Award of the Indian Institute of Technology Madras (2019), Outstanding Achievements Award from the University of Minnesota (2018), the Warner T. Koiter Medal of the American Society of Mechanical Engineering (2015), and Graduate Student Council Teaching and Mentoring Award at Caltech (2013). He served as editor of the Journal of the Mechanics and Physics of Solids from 2004 to 2015.


October 10, 2019
Univ.-Prof. Friedrich Bleicher
Vienna Institute of Technology
Professor and Head, Institute of Production Engineering and Photonic Technologies

video of lecture (requires CAE login from College of Engineering)

Low-frequency vibration-assisted single-point deep-hole drilling

Deep-hole drilling is defined by depth-to-diameter ratios (L/d) greater than 10:1. With its origins tracing back to the need for straighter, more accurate gun barrels, applications of deep-hole drilling in metal alloys are expanding in energy, chemical, process, and oil field industries. As an example, in the petroleum industry, tools for directional drilling of wellbores consists of tubes made of highly alloyed steels which include deep holes with a L/d-ratio up to 450 at diameters of about d = 5 mm to 6.35 mm.

Deep-hole drilling consists of boring and trepanning association (BTA) drilling and gun drilling, with additional processes designed for specific tolerance objectives and generally performed on dedicated deep-hole drilling machines. The drilling process is used in a variety of alloys from light-weight, non-ferrous, ferrous, and super-alloys. Achieving tight control of diameter, straightness, and superior surface finish is still one of the most challenging topics of research in machining. Deep-hole drilling processes use special tools and setups to deliver high pressure coolant, evacuate chips cleanly, and achieve depth-to-diameter holes into metals beyond what a common CNC machine can reach.

However, chip evacuation is the main difficulty in the deep-hole drilling process. If the chips are not efficiently removed from the bottom of the deep hole that is being drilled then an unstable process behavior appears due to chip congestion effects and related tool breakage. In practical deep-hole drilling processes, too great of a feed per revolution will cause drill breakage due to the low rigidity of the tool, while using a small feed per revolution is inefficient. In order to provoke active chip breakage in machining with single-point drills at small diameters, vibration-assistance can be effectively applied. The influence of low-frequency and high-amplitude vibration-assistance on the chip formation is demonstrated in the drilling of age-hardened copper-zirconium, a material used e.g., in rocket propulsion applications. FEM-simulation coupled with a kinematic model is used to describe the interrelation of vibration and process parameters, like the resulting uncut chip thickness and effective velocity.

Prof. Dr. Friedrich “Fritz” Bleicher is a Professor and Head of the Institute of Production Engineering and Photonic Technologies at the Vienna University of Technology (TU Wien). The Institute has 120 staff, 75,000 sq.ft. of facilities, and an annual research budget of €10 Million to conduct fundamental and applied research on advanced manufacturing processes. Prof. Bleicher received his doctorate in mechanical engineering from TU Wien in 1996 and worked in the machine tool industry prior to returning to TU Wien. His research focuses on the development and optimization of machining processes (cutting technologies) with geometrically defined cutting edges, grinding technologies, development and optimization of machine tool structures for cutting applications, robotic machining, manufacturing automation, adaptive and hybrid machining technologies, electrochemical machining technologies and additive manufacturing. Prof. Bleicher is an Associate Membership at CIRP—International Academy of Production Engineering.


October 24, 2019
Prof. J. S. Chen
University of California, San Diego
William Prager Professor, Department of Structural Engineering, Irwin & Joan Jacobs School of Engineering

video of lecture (requires CAE login from College of Engineering)

Variationally consistent reproducing kernel particle method for modeling man-made and natural disasters

In the past two decades, meshfree methods have emerged into a new class of computational methods with considerable success. In addition, a significant amount of progress has been made in addressing the major shortcomings that were present in these methods at the early stages of their development. Meshfree methods such as the Reproducing Kernel Particle Method (RKPM) are well-suited for modeling materials and solids undergoing fracture and damage processes, and nodal integration is a natural choice for this class of problems. However, nodal integration suffers from spatial instability, and the excessive material deformation and damage process could also lead to kernel instability in RKPM. This presentation reviews the recent advances in nodal integration for meshfree methods that are stable, accurate, and with optimal convergence. A variationally consistent integration (VCI) is introduced to allow correction of many low-order quadrature rules to achieve optimal convergence, and several stabilization techniques will be discussed. The application of the new RKPM formulation for fracture to damage multiscale mechanics and materials modeling, and their applications to the modeling of extreme events, will be demonstrated. These include the modeling of man-made disasters such as fragment-impact processes, penetration, shock and blast events, as well as natural disasters such as landslide will be presented to demonstrate the effectiveness of the new developments.

Prof. J. S. ChenProf. J. S. Chen is currently the Inaugural William Prager Chair Professor of Structural Engineering Department and the Director of Center for Extreme Events Research at the University of California, San Diego. Before joining UCSD in October 2013, he was the Chancellor’s Professor of UCLA’s Civil & Environmental Engineering Department, where he served as the Department Chair from 2007 to 2012. J. S. Chen’s research is in computational mechanics and multiscale materials modeling with specialization in the development of meshfree methods. He is the Past President of US Association for Computational Mechanics (USACM) and the Past Present of ASCE Engineering Mechanics Institute (EMI). He has received numerous awards, including the Computational Mechanics Award from International Association for Computational Mechanics (IACM), the ICACE Award from International Chinese Association for Computational Mechanics (ICACM), the Ted Belytschko Applied Mechanics Award from ASME Applied Mechanics Division, the Belytschko Medal, U.S. Association for Computational Mechanics (USACM), among others. He is the Fellow of USACM, IACM, ASME, EMI, ICACM, and ICCEES.

Past Lindbergh Lecture guests

February 8 – Prof. Ajit Yoganathan, Georgia Institute of Technology

February 22 – Prof. George Pharr, Texas A&M University

March 8 – Xin Sun, Oak Ridge National Lab

March 22 – Prof. Don Lucca, Oklahoma State University

April 12 – Prof. Walter Herzog, University of Calgary

April 26 – Prof. Omar Ghattas, University of Texas-Austin

September 14 – Prof. Thomas Kurfess, Georgia Institute of Technology

September 25 – Prof. Andre Boehman, University of Michigan

October 12 – Ray Radebaugh, National Institute of Standards and Technology

October 26 – Mark Zagarola, Creare

November 9 – Prof. Daniel Haworth, Pennsylvania University

December 14 – Prof. Andy Ruina, University of Cornell

January 26 – Prof. Suresh Advani, University of Delaware

February 9 – Prof. Tom Hughes, University of Texas-Austin

February 23 – Tom Peterson, Cryogenics Department at Fermilab

March 9 – Prof. Michael Sutton, University of South Carolina

April 13 – Jackie Chen, Sandia – Livermore

April 27 – Prof. James Patton, University of Illinois-Chicago

September 15 – Prof. Bogden Epureanu, University of Michigan

September 29 – Prof. Iwona Jasiuk, University of Illinois Urbana-Champaign

October 13 – Prof. Jacob Leachman, Washington State University

October 27 – Prof. Karthik Ramani, Purdue University

November 10 – Prof. Jeffery Sutton, Ohio State University

December 8 – Prof. Jose Castro, Ohio State University