Micromechanical Exfoliation and Graphene: 1999 papers and brief discussion of them
The discovery of a new material type, graphene and extremely thin platelets of graphite, was discussed in several articles from my research group published in 1999:
Lu XK, Huang H, Nemchuk N, and Ruoff RS, Patterning of highly oriented pyrolytic graphite by oxygen plasma etching, APPLIED PHYSICS LETTERS, 75, 193-195 (1999).
A good beginning of 2007
In the very beginning of 2007 I have four papers published or accepted (one is independent research and others are collaborated). All of them are the work done in my doctoral period. The topic is focusing on the enhancement of creep resistance of polymers by incorporating of nanofillers including particles and CNTs.
Journal Club Theme of March 2007: Mechanics of Flexible Electronics
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Flexible electronics is an emerging technology with an exciting array of applications, ranging from paper-like displays, skin-like smart prosthesis, organic light emitting diodes (OLEDs), to printable solar cells. These potential applications will profoundly impact various facets of our daily life, and excite our curiosity on: what's the future of newspapers and books? Will OLEDs replace light bulbs and fluorescent lamps, and emerge as future lighting source? Can we power electronic devices everywhere cordlessly? Significant progress has been made in the past several years, especially as sizable investments flux in. For example, Polymer Vision just released the first commercial product of rollable display (as shown in the figure) after secured $26M investment in January 2007. The future success of this emerging technology largely relies on:
Three-dimensional anisotropic elasticity - an extended Stroh formalism
Tom Ting and I have recently developed a method of extending Stroh's anisotropic formalism to problems in three dimensions. The unproofed paper can be accessed at http://www-personal.umich.edu/~jbarber/Stroh.pdf .
Quasi-continuum orbital-free density-functional theory : A route to multi-million atom electronic structure (DFT) calculation
I would like to share the research work I have been pursuing over the past four years. I believe, through this forum, I will be able to reach researchers with various backgrounds and expertise. Suggestions and comments from members will be very useful. I am also attaching links to preprints of manuscripts describing this work. Please follow these links:
http://www-personal.umich.edu/~vikramg/academic/Preprints/QC-OFDFT.pdf
Multi-Axial Failure Models for Fiber-Reinforced Composites
The increasing use of fiber-reinforced composites accentuates the need for developing multi-axial fatigue failure models for these materials. In this article (attached), we proposed several multiaxial fatigue failure models for fiber-reinforced composites considering the contribution of mean and cyclic normal stress/strain and shear stress/strain at the plane of failure and examined their capability for predicting the fatigue life of the E-glass/epoxy composite materials.
Accuracy and error estimation in extended finite element methods
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Stephane Bordas, Marc Duflot and Pierre-Olivier Bouchard announce the WCCM8 mini-symposium Link to detailed pdf description
Submit your contribution here before Dec. 15th 2007
Which phenomenological flow stress model is the best?
A couple of years ago a colleague who wanted to simulate high-speed machining asked me: " Which is the best phenomenological flow stress model for metals?" I wasn't able to give an answer right away and decided to look in the literature.
What I found was, every ten years or so, a new model appears in the literature that tries to solve some of the problems of older models. However, a clear ranking of models has not been established yet.
eXtended Finite Element Method: Short Course Notes
I taught a short course some time ago on the eXtended Finite Element Method, and thought many people would find the notes useful.
So I've posted them here, in .mov format (as exported with the Apple software keynote). The advantage of this format is that, when you click on one of the .mov files, it should open a separate browser. Clicking in the window will advance the slide. This way you see all the movies, etc, as well as the sequence as it appears when I gave the talk. There is a way to add audio to this format as well - something I may pursue in the future.