Blog posts
Postdoctoral Cecil and Sally Drinkward Fellowship Competition at Caltech
The Mechanical and Civil Engineering Department at Caltech is inviting applications for a one-year postdoctoral scholar position in Civil Engineering and Applied Science. This is an endowed postdoctoral fellowship with the intention to identify and groom the best talent in the field.
More information on the process and how to apply can be found at https://applications.caltech.edu/job/drinkward
Acta Mechanica Sinica (Volume 33, Issue 1, 2017 ) is online now !
Acta Mechanica Sinica (Volume 33, Issue 1, 2017 ) is online now !
Dear everyone!
The first issue in 2017 (Volume 33, Issue 1) of Acta Mechanica Sinica (AMS) is online now.
Welcome to this SCI-indexed journal http://ams.cstam.org.cn for rapid publication of your exciting results.
_______________________________________________________________________________
Textbook on Modeling Nonlinear Problems in the Mechanics of Strings and Rods
My latest textbook, O. M. O’Reilly, Modeling Nonlinear Problems in the Mechanics of Strings and Rods, has just been published by Springer Verlag. The electronic version of this book is available (for free if your university's library has a subscription) on this website:
http://www.springer.com/us/book/9783319505961
Compressible, Dense, Three-Dimensional Holey Graphene Monolithic Architecture
We demonstrated outstanding compressibility of holey graphene nanosheets, which is impossible for pristine graphene. Holey graphene powder can be easily compressed into dense and strong monoliths with different shapes at room temperature without using any solvents or binders.
ACS Nano, Article ASAP, http://pubs.acs.org/doi/abs/10.1021/acsnano.7b00227
3-year PhD position at University Paris-Est on multiscale cracking modeling in 3D printed glass-polymer composites
We are looking for highly motivated PhD candidates to study the multiscale cracking in 3D printed glass-polymer composites. The main objectives of the project are to develop a multiscale numerical modeling framework for cracking in PA12/glass beads samples obtained by additive manufacturing (Selective Laser Sintering, SLS) and to combine these numerical tools with experimental 3D imaging and in-situ mechanical testing techniques to identify the models. The PhD is part of a funded national research project involving several academic institutions and an industrial partner.
The normal-auxeticity mechanical phase transition in graphene
When a solid object is stretched, in general, it shrinks transversely. However, the abnormal ones are auxetic, which exhibit lateral expansion, or negative Poisson ratio. While graphene is a paradigm 2D material, surprisingly, graphene converts from normal to auxetic at certain strains. Here, we show via molecular dynamics simulations that the normal-auxeticity mechanical phase transition only occurs in uniaxial tension along the armchair direction or the nearest neighbor direction. Such a characteristic persists at temperatures up to 2400 K.
Toward realization of computational homogenization in practice
Dear all,
I have read the article of Yuan and Jacob Fish entitled "Toward realization of computational homogenization in practice" and realize that they have published the source code they used in their paper. Unfortunately, I cannot download the code from the link that the authors provided. I wonder if any of you have downloaded the code before. If so, please kindly share the code to me.
Thanks in advance.
Ken
Localization and instability in sheared granular materials: Role of friction and vibration
Shear banding and stick-slip instabilities have been long observed in sheared granular materials. Yet, their microscopic underpinnings, interdependencies and variability under different loading conditions have not been fully explored. Here, we use a non-equilibrium thermodynamics model, the Shear Transformation Zone theory, to investigate the dynamics of strain localization and its connection to stability of sliding in sheared, dry, granular materials. We consider frictional and frictionless grains as well as presence and absence of acoustic vibrations.
Objective Fracture Parameters and a Paradox for Interface Cracks
Due to the oscillatory singular stress field around a crack tip, interface fracture has some peculiar features. This paper is focused on two of them. One can be reflected by a proposed paradox that geometrically similar structures with interface cracks under similar loadings may have different failure behaviors. The other one is that the existing fracture parameters of the oscillatory singular stress field, such as a complex stress intensity factor, exhibit some nonobjectivity because their phase angle depends on an arbitrarily chosen length.