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Voiland College of Engineering and Architecture School of Mechanical and Materials Engineering

MME Seminar Series Welcomes Mr. Adnan Morshed, PhD Candidate, Washington State University

Mr. Adnan Morshed

PhD Candidate, School of Mechanical and Materials Engineering, Washington State University

Held in ETRL 101

Refreshments served in ETRL 119 at 10:30 am

Modeling of Biomechanical Systems in Microfluidic Device

Abstract

Electrodeformation of vesicles can be used as a useful tool to understand the characteristics of biological soft matter. Microfluidic devices are especially useful in this regard where the vesicles immersed in a fluid medium are subjected to an applied electric field. With minimal effort, a lot of intricate geometry can be imprinted in microfluidic chips which allows to observe the shift in vesicle deformation behavior. Modeling this kind of physical system requires consideration of both electric and hydrodynamic descriptions. The complex response of the vesicle membrane strongly depends on the conductivity of surrounding fluid, vesicle size and shape, and applied electric field. We studied the electrodeformation of vesicles immersed in a fluid media under a short DC electric pulse. An immersed interface method is used to solve the electric field over the domain with conductive or     non-conductive vesicles while an immersed boundary scheme is employed to solve fluid flow, fluid-solid interaction, membrane mechanics and vesicle movement. Force analysis on the membrane surface reveals almost linear relation with vesicle size, but highly nonlinear influence of applied field as well as the conductivity ratios inside and outside of the vesicle. Results also point towards an early linear deformation regime followed by an equilibrium stage for the membranes. Moreover, significant influence of the initial aspect ratio of the vesicle on the force distribution is observed across a range of conductivity ratios.

Biography

Adnan Morshed is in the third year of his PhD program at MME. His primary research interest is in the modeling of micro- and nanoscale biological phenomena. At present, his research is focused on the numerical exploration of experimentally hard to reach terrains in soft biological vesicles and studying key biophysical pathways in cancer propagation. He completed his B.Sc. and M.Sc. in mechanical engineering from Bangladesh University of Engineering and Technology (BUET).

Adnan enjoys computer programming and is fascinated with typography. He loves hiking and exploring the beautiful Northwest.

 

 

MME Seminar Series Welcomes Dr. Georges Ayoub, University of Michigan

Dr. Georges Ayoub

Assistant Professor, Industrial & Manufacturing Systems Engineering, University of  Michigan– Dearborn

Held in the  ETRL 101 Lecture Hall

Refreshments served in ETRL 119 at 10:30 am

Uncovering the deformation mechanisms in Ti/TiN multi layer under compressive, multi axial and nano-indention behavior with MD simulations

 

Abstract

The promising mechanical, physical and chemical properties of nano-scale metal/ceramic multilayers (MCMs) are of high interest for extreme environment applications. Understanding the plastic deformation mechanisms and the variables affecting those properties is therefore essential. The interface characteristics and the plastic deformation mechanisms under compressive, multiaxial and nano-indentation loadings in a Ti/TiN multilayer with a semi-coherent interface are numerically investigated. The interface structure of the Ti/TiN interface and the interface misfit dislocation were characterized using molecular dynamic simulations combined with atomically informed Frank-Bilby method. Three possible atomic stacking interface structures are identified according to the crystallographic analysis of the interface. Upon relaxation, large interface areas are occupied with the energetically stable configuration. Furthermore, the higher energy stacking are transformed into misfit dislocations or dislocation nodes. The Ti/TiN multilayer structure shows high strength and ductility under uniform compression loading. However, low strength and ductility are observed under tensile loading favored by crack initiation and propagation. Unlike typical metal stress-strain curves, metal/ceramic multilayers show two main yield points. Furthermore, the Ti/TiN multilayer structure shows three distinctive peak points for compressive loading normal and parallel to the interface. Furthermore, the misfit dislocation network at the Ti-TiN interface is found to dissociate to partials under driving force on the indenter tip and play an important role in the strengthening of Ti/TiN multilayers. We have observed several deformation mechanisms such as dislocation pile-up on the interface, and movement of misfit dislocations.

 

 Biography

Dr. Georges Ayoub completed his Ph.D at Lille University of science and technology in north France. Dr. Ayoub obtained his Master’s degree in 2007, also from Lille 1 University. Dr. Ayoub undergraduate work was completed at the Polytechnic Engineering School of the Lille 1 University (Polytech’Lille) in the field of mechanical engineering. Dr. Ayoub also obtained an Undergraduate Diploma in materials science at the University of Rennes 1 with highest distinction.

As a researcher, Dr. Ayoub started his career working in the capacity of a Post-doctoral Research Fellow at Texas A&M University at Qatar. He was promoted, in 2012 to Assistant Research Scientist and took leadership over 3 research projects in Qatar. Since then he has been able to establish his own independent research program and was awarded funding for 3 projects. Between August 2014 and August 2016 Dr. Ayoub worked as assistant professor at the American University of Beirut (AUB) and maintained an affiliation with Texas A&M University at Qatar as a Visiting Associate Research Scientist. Dr. Ayoub joined the University of Michigan Dearborn in September 2016, as assistant professor. His research projects involve experimental testing, characterizing and modeling the behavior of polymers and metal alloys. The research also entails developing algorithms and coupling them with finite element analysis to predict the material behavior under desired temperatures, deformation rates and loading conditions. Dr. Ayoub research has been published in more than 30 journal papers appearing in journals with high impact factors.

 

MME Seminar Series welcomes Dr. Behcet Acikmese, University of Washington

Dr. Behcet Acikmese

William E. Boeing Department of Aeronautics and Astronautics & Department of Electrical Engineering, University of Washington, Seattle

 

Held in ETRL 101

Refreshments served in ETRL 119 at 10:30 am

Everyone is encouraged to attend!

Real-time optimization for Guidance and Control of Autonomous Aerospace Vehicles

Abstract

Many future aerospace engineering applications will require dramatic increases in our existing autonomous control capabilities. These include robotic sample return missions to planets, comets, and asteroids, formation flying spacecraft applications, applications utilizing swarms of autonomous agents, unmanned aerial, ground, and underwater vehicles, and autonomous commercial robotic applications. A key control challenge for many autonomous systems is to achieve the performance goals safely with  minimal resource use in the presence of mission constraints and uncertainties. In principle these problems can be formulated and solved as optimization problems. The challenge is solving them reliably onboard the autonomous system in real time.

Our research has provided new analytical results that enabled the formulation of many autonomous control problems in a convex optimization framework, i.e., convexification of the control problem. The main mathematical theory used in achieving convexification is the duality theory of optimization. Duality theory manifests itself as Pontryagin’s Maximum Principle in infinite  dimensional optimization problems and as KKT conditions infinite dimensional parameter optimization problems. Both theories were instrumental in our developments. Our analytical framework also allowed the computation of the precise bounds of performance for a control system in term of constrained controllability/reachability sets. This proved to be an important step in rigorous V&V of the resulting control decision making algorithms.

This seminar introduces several real-world aerospace applications, where this approach provided dramatic performance improvements over the heritage technologies. An important application is the fuel optimal control for planetary soft landing, whose complete solution has been an open problem since the Apollo Moon landings of 1960s. We developed a novel “lossless convexification” method, which enables the next generation planetary missions, such as Mars robotic sample return and manned missions. Another application is in Markov chain synthesis with “safety” constraints, which enabled the development of new decentralized coordination and control methods for spacecraft swarms.

 

Biography

Behcet Acıkmese is a faculty in Department of Aeronautics and Astronautics and an adjunct faculty in Department of Electrical Engineering at University of Washington, Seattle. He received his Ph.D. in Aerospace Engineering from Purdue University. He was a senior technologist at JPL and a lecturer at Caltech. At JPL, He developed control algorithms for planetary landing, spacecraft formation flying, and asteroid and comet sample return missions. He developed the “flyaway” control algorithms in Mars Science Laboratory (MSL) mission, and the RCS algorithms for NASA SMAP mission. Dr. Acıkmese  invented a novel real-time convex optimization based planetary landing guidance algorithm (G-FOLD) that was flight tested by JPL, which is a first demonstration of a real-time optimization algorithm for rocket guidance. He is a recipient of NSF CAREER Award, several NASA Achievement awards for his contributions to NASA missions and new technology development. He is an Associate Fellow of AIAA, a Senior Member of IEEE, and an associate editor of IEEE Control System Magazine and AIAA JGCD.

 

 

MME Seminar Series Welcomes Dr. Peter Borgesen, Binghamton University

In ETRL 101
Refreshments served in ETRL 119 at 10:30 am

 

Dr. Peter Borgesen

Professor of Systems Science and Industrial Engineering and of Materials Science, Binghamton University, State University of New York

Deformation and Fatigue of SnAgCu Solder Joints

Abstract

The properties and behavior of the high-Sn alloys currently favored by the microelectronics industry have been the subject of a very large number of studies over the past 2 decades, but a fundamental mechanistic understanding is only now starting to emerge. Realistic solder joints are each the result    of  a single solidification event, i.e. they are cyclically twinned but have no real grain boundaries. This together with the nature of the β-Sn crystal structure and effects of the unstable precipitate distributions lead to a complex behavior under cyclic loading.

This presentation will outline and discuss a first mechanistically justified model of the fatigue of SnAgCu solder joints under realistic long term service conditions. This includes identification of the dominant inelastic deformation mechanism and the effects of vacancy diffusion on the different crack growth modes in thermal and isothermal cycling. Practical consequences and use will be addressed.

Biography

Peter Borgesen is Professor of Systems Science and Industrial Engineering, and of Materials Science, at Binghamton University. He worked at Riso National Laboratory and received a Ph. D. in Physics from University of Aarhus, Denmark. After 4 years in the Surface Physics Department at the Max Planck Institute for Plasma Physics in Germany and 8 years in the Materials Science Department at Cornell University he joined Universal Instruments Corp. in 1994. There he managed a multi-million research effort funded by an international consortium of major microelectronics companies, focusing on manufacturing processes and reliability. He joined Binghamton University in January of 2009. He has held a visiting position at the University of Bordeaux, France, and served on a range of panels and committees, including the so-called Lead Free Electronics Manhattan Project. Professor Borgesen’s current research is in the area of microelectronics reliability, most recently with an emphasis on flexible hybrid electronics.

MME Seminar Series Welcomes Dr. Erin Barker, Pacific Northwest National Laboratory

In ETRL 101

Refreshments served in ETRL 119 at 10:30 am

Process to Structure to Property Modeling of Dissimilar Material Joining

Abstract

The automotive industry has been taking specific steps to reduce vehicle to improve fuel economy.  Materials such as aluminum and magnesium alloys have been investigated as alternatives to heavy steel components.           Advanced high strength steels have also been developed to target a regime of higher strength but lower weight.  Introducing a variety of materials for the structural and non-structural components of the vehicle requires designers and engineering to consider how to join the materials. This variety of        materials often have very different metaling point ruling out traditional joining techniques.  This talk will describe the friction stir scribe joining technique and how modeling is being used to understanding the underlying physics occurring during the process.  The techniques being used to model the   process to structure and structure to properties linkages will also be         discussed.

Biography

Erin Iesulauro Barker received her Ph.D in Civil Engineering from Cornell University in 2006.  At Cornell, she was a member of the Cornell Fracture Group where she focused on computational solid mechanics and fracture mechanics as well as software development.  She began her career at Los Alamos National Lab as a post-doc and then staff scientist working on multi-physics and multi-scale simulation capabilities.  In 2010, she joined PNNL in the Computational Engineering Group.  Her work has focused on developing models for material behavior and failure at the microstructure scale.  She is also heavily involved in developing software tools and frameworks for material modeling from synthetic sample generation to high performance computing simulation capabilities.  Erin is currently the Acting Group Lead for the Computational Engineering Group.

 

Meet Mary

Mary Rezac is the new dean of Washington State University's Voiland College of Engineering and Architecture.

Mary Rezac is Voiland College of Engineering and Architecture’s new dean. She comes to Pullman from Kansas State University, where she served as Tim Taylor Professor of Chemical Engineering and director of Major Grant Initiatives in the College of Engineering.

Here’s a chance to get to know Mary and her thoughts on the future of Voiland College. » More …

Giving Opportunity

Ramiro Gonzalez

Strategically looking for answers, Ramiro Gonzalez gazes across his table that lies covered in papers, a ruler, textbooks, different colored pens, and a cup of tea. It’s a daily routine, as he waits for someone to help. » More …

Lab Safety Training

The Voiland College of Engineering and Architecture (VCEA), in partnership with WSU Environmental Health & Safety, created a specifically designed safety course to address the most common safety practices and areas of risk lab users may experience at WSU.

The course has been taken by numerous seasoned scientists, as well as those with no lab experience.  Both groups have noted they come away from the course pleasantly surprised at what they learned, and most make changes in their lab practices as a result.

VCEA strongly encourages all Voiland College of Engineering and Architecture personnel working or supporting a lab environment take this training, indifferent of their experience.

The training, already a requirement for any PACCAR lab user, provides an updated look at current lab practices in addition to three primary areas that influence risk within a lab.

  • Five Focus Areas and Chemical Compatibility
  • General Laboratory Safety and Hazard Communication
  • Dangerous Waste Generator, Chemical Storage, Emergency Response and Planning

The safety course is free of charge.

Silver Cloud

Using foglike microdroplets of silver, WSU researchers create intricate structures that mimic natural materials. Pictured: nanoparticles forming the letters W S U.

Washington State University researchers have developed a unique, 3-D manufacturing method that for the first time rapidly creates and precisely controls a material’s architecture from the nanoscale to centimeters – with results that closely mimic the intricate architecture of natural materials like wood and bone.

They report on their work in the journal Science Advances (http://advances.sciencemag.org/content/3/3/e1601986) and have filed for a patent. » More …

Keeping Up With Kory

Kory O’Connor in WSU's Formula SAE race car

Mechanical engineering major Kory O’Connor is a man in motion.

Kory, how did you choose mechanical engineering as your major?

Since I was a kid, I loved taking things apart and figuring out how they worked. If there is something that is broken, I like to try and figure out how to fix it. I like to work with my hands and I liked things that moved and were powered with something – cars, robots, or anything that has motion – and mechanical engineering is the perfect match for that. » More …