Fw: ME Seminar by Dr. Eugene Kheng, 27 May, 11.15-12.15pm, E3-06-08
Alvin Tan
From: Sherine Tiew (NUS)
Sent: Wednesday, 21 May, 2014 11:15 AM
Subject: ME Seminar by Dr. Eugene Kheng, 27 May, 11.15-12.15pm, E3-06-08
Kindly assist to disseminate this seminar announcement to your students and colleagues. Thank you!
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Topic: | Fracture Mechanics of a Layer-By-Layer(LBL) Nanocomposite |
Speaker: | Dr. Eugene Kheng |
Date: | 27 May 2014, Tuesday |
Time: | 11.15am to 12.15pm |
Venue: | E3-06-08 (map of NUS can be found at http://map.nus.edu.sg/) |
Host: | Assoc Prof CJ Tay |
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Layer-By-Layer nanocomposites are thin films formed by sequentially depositing oppositely charged nanoscale thin materials such as polymers, ceramics, carbon nanotubes, etc, to a substrate. The film can then be detached from the substrate to obtain a free standing film consisting of hundreds of distinct nanometer scale thickness layers. These novel films display interesting fracture mechanisms and targeted for use in a wide variety of applications, including layered structural materials as armor. The presentation will begin with an overview of how LBL materials are manufactured, as well as the recent advances in deposition technology. A brief overview of fracture mechanics will be given, particularly how a fracture develops in specimens consisting of a single material. A method of obtaining the fracture toughness for a thin film undergoing plastic deformation will be presented. This method allows us to differentiate the energy dissipated by crack growth from energy dissipated by plastic deformation. In addition, various fracture mechanisms observed in LBL nanocomposites have been directly observed by carrying out the fracture test inside a Scanning Electron Microscope. In particular: • Void Growth • Crack Tip Lag • Crack Tip Separation
A short audience demonstration of crack tip lag will follow, to further demonstrate that unique fracture mechanisms can be obtained through the novel construction of materials. | |
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Dr Eugene Kheng is a recent PhD graduate from the Mechanical Engineering Department of University of Michigan, Ann Arbor, where he was a student since 2003. His research interests lie in the area of fracture mechanics, solid mechanics, novel materials and their manufacture. He has collaborated actively with researchers in other disciplines of material development, particularly Chemical Engineering and Material Science & Engineering. Dr Kheng greatly enjoys teaching and instruction. He has lectured at conferences, in university classes and has lead informal class discussions. He considers teaching his life’s calling. In his free time, he enjoys playing and teaching billiards. He is also a proud father of an overly active daughter. | |
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