SUNMONTUEWEDTHUFRISAT
Conferences, Lectures, & Seminars
Events for November
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Aerospace and Mechanical Engineering Seminar Series
Wed, Nov 05, 2014 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Addis Kidane, Assistant Professor in Department of Mechanical Engineering at University of South Carolina, Columbia, SC
Talk Title: Mechanics of Materials at Extreme Environment, at Different Time and Length Scale: A Digital Image Based Approach
Series: Aerospace and Mechanical Engineering Seminar Series
Abstract: Understanding the failure mechanism of materials at extreme condition is essential and at the same time challenging. There have been different approaches proposed over the years to studying materials response at extremely aggressive environment, for example high pressure, ultrahigh temperature. With the advent of high speed imaging systems and computer processing power, these days, high quality images can be taken as fast as 200 million frames / sec and one can study the failure mechanisms at such a high events by carefully analyzing the digital images taken during testing. We used a digital image based approach and characterize the deformation mechanism of materials at different loading conditions, at different time and length scale and temperature. In this talk, different examples such as, shock loading of rigid foams and pre-stressed composite, local heterogeneity in polycrystalline materials and deformation of materials at temperature above 1000°C will be presented.
Biography: Addis Kidane is an assistant professor of Mechanical Engineering at the University of South Carolina. He got his Ph.D. from the University of Rhode Island in 2009 and spent 2 years at California Institute of Technology as a postdoctoral scholar before he moved to Columbia. His research interests are in the areas of failure and fracture of materials at extreme conditions, functionally graded materials, digital image based experimental analysis. He is a recipient of the 2013 Haythornthwaite Research Initiation Grants, from the ASME Applied Mechanics Division and the 2014 AFOSR Young Investigator Research Program (YIP) award.
Host: Professor Paul Ronney
Location: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: Valerie Childress
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Aerospace and Mechanical Engineering Seminar Series
Wed, Nov 12, 2014 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Emmanuel Gdoutos, Professor in Department of Civil and Environmental Engineering at Northwestern University, Evanston, IL & School of Engineering, Democritus University of Thrace, Xanthi, Greece
Talk Title: Failure Modes of Sandwich and Cellular Materials
Series: Aerospace and Mechanical Engineering Seminar Series
Abstract: Sandwich structures consisting of strong and stiff facings and light weight cores offer improved stiffness and strength to weight ratios compared to monolithic materials. Under flexural loading the facings carry almost all of the bending, while the core takes the shear loading and helps to stabilize the facings. Facing materials include metals and fiber reinforced composites. The latter are being used in advanced applications due to the large strength-to-weight ratio. The core materials mainly include honeycombs, cellular foams and wood. In the present seminar the failure behavior of composite sandwich beams subjected to three- and four-point bending will be presented. The beams were made of unidirectional carbon/epoxy facings and various core materials including PVC closed-cell foams, a polyurethane foam and an aluminum honeycomb. Various failure modes including facing wrinkling, indentation failure and core failure were observed and compared with analytical predictions. It was established that the initiation, propagation and interaction of failure modes depend on the type of loading, constituent material properties and geometrical dimensions. The crack growth behavior of polymeric foams under mixed-mode loading conditions will also be presented. Polymeric foams are anisotropic materials and crack kinking occurs even though the applied load is perpendicular to the crack plane. The stress analysis of the plate was performed by finite elements. Crack trajectories for various angles of the orientation of the axes of orthotropy of the material with respect to the applied load were obtained.
Biography: Emmanuel Gdoutos is Professor of Theoretical and Applied Mechanics and Director of the Laboratory of Applied Mechanics at the Democritus University of Thrace, Greece, and Adjunct Professor at Northwestern University. His interests and experience include many areas of mechanics of materials with emphasis on experimental mechanics, fracture mechanics, composite materials and nanotechnology. He serves on the editorial board of eight international journals. He has awarded two Fulbright fellowships and an excellent teaching award from the University of Toledo. He has held numerous lectureships and visiting professorships (Lehigh Univ., Univ. of California at Santa Barbara and Davis, Toledo Univ., Michigan Technological University. and Northwestern University). He served as chairman of the Department of Civil Engineering of the Democritus University of Thrace. He authored over 240 papers in refereed journals and conference proceedings, 15 books and edited 14 books. His book titled "Fracture Mechanics - An Introduction" is a widely used textbook for fracture mechanics courses.
Host: Professor Paul Ronney
Location: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: Valerie Childress
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Aerospace and Mechanical Engineering Seminar Series
Wed, Nov 19, 2014 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Sunghwan (Sunny) Jung, Assistant Professor in Department of Biomedical Engineering and Mechanics at Virginia Tech, Blacksburg, VA
Talk Title: Fluid Mechanics of Drinking and Diving
Series: Aerospace and Mechanical Engineering Seminar Series
Abstract: Drinking is defined as the animal action of taking water into the mouth, but to fluid mechanists, it is simply one kind of fluid transport phenomena. Classical fluid mechanics show that fluid transport can be achieved by either pressure-driven or inertia-driven processes. In a similar fashion, animals drink water using pressure-driven or inertia-driven mechanisms. For example, domestic cats and dogs lap water by moving the tongue fast, thereby developing the inertia-driven mechanism. We will investigate how cats and dogs drink water differently and discuss the underlying fluid mechanics.
Diving is the activity of falling from air into water, which is somewhat dangerous due to the impact. Humans dive for entertainments less than 20 meters high, however seabirds dive as a hunting mechanism from more than 20 meters high. Moreover, most birds including seabirds have a slender and long neck (13~25 vertebrae) compared to many other animals, which can potentially be the weakest part of the body upon axial impact compression. Motivated by the diving dynamics, we investigate the effect of surface and geometric configurations on structures consisting of a beak-like cone and a neck-like elastic beam. A transition from non-buckling to buckling is characterized and understood through physical experiments and an analytical model.
Biography: Sunghwan (Sunny) Jung is a faculty member in the Department of Biomedical Engineering and Mechanics (formerly, Department of Engineering Science and Mechanics), Virginia Tech. Dr. Jung received his PhD in Physics at the University of Texas at Austin and spent two years at the Courant Institute, NYU. Prior to Virginia Tech, he was a math instructor at MIT for two years. His research interests are a variety of fluid mechanics problems occurring in biological systems.
Host: Professor Paul Ronney
Location: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: Valerie Childress
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor.
