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nanomechanics

Surface mediated plasticity in sub-10-nm-sized gold crystals

Nature Communications 1, Article number:144 | DOI:10.1038/ncomms1149

Although deformation processes in submicron-sized metallic crystals are
well documented, the direct observation of deformation mechanisms in
crystals with dimensions below the sub-10-nm range is currently lacking.
Here, through in situ high-resolution transmission electron
microscopy (HRTEM) observations, we show that (1) in sharp contrast to
what happens in bulk materials, in which plasticity is mediated by
dislocation emission from Frank-Read sources and multiplication, partial
dislocations emitted from free surfaces dominate the deformation of

Julien Yvonnet's picture

Sixth M.I.T. Conference on Computational Fluid and Solid Mechanics: special session on Multiscale Computational Nanomechanics

We are inviting abstracts for the following special session: Multiscale Computational Nanomechanics, Sixth MIT conference on Computational Fluid and Solid Mechanics, June 15-17, 2011, Cambridge, MA, USA.

http://www.sixthmitconference.org/

Abstract submission deadline: February 15, 2011.

 

 

The topics covered by this special session include (but are not limited to):

 

-Continuum modeling incorporating nanoscale effects

Markus J. Buehler's picture

Special issue on "Computational and Theoretical Materiomics" now published (J. Computational &Theoretical Nanoscience)

The special issue on "Computational and Theoretical Materiomics: Properties of Biological and de novo Bioinspired Materials" has now been published. A list of papers is included below. A sincere thank you to all contributors! Anyone interested in a reprint of any of the articles please send me a message.

Ali_Hadjesfandiari's picture

New perspective on Couple Stress theory resolving the indeterminacy issue

Dear fellow Mechanicians,We have done this research on couple stress theory which we believe has resolved the problem of indeterminacy in the spherical part of the couple-stress tensor and the appearance of the body couple in the constitutive relation for the force-stress tensor  (Mindlin and Tiersten, 1962).I humbly request you to read the paper and give me your feedback.

PhD Research Positions in Computational Nanomechanics at the University of Pittsburgh

Several PhD research positions are currently open in the Computational Nanomechanics Group at the University of Pittsburgh for the following research projects:

 

1.  Thermomechanical behavior of carbon-based nanomaterials

2.  Atomistic-to-continuum themomechanical theory in solids

3.  Mechanics of nanoporous and nanocrystalline metals

 

Acurate Size Measurements of Nano Particles and Nano Pores Make Mechanical Understanding Easy

Encouraged by its current and prospective customers, Ebatco’s Nano Analysis and Testing Laboratory (NAT Lab) has expanded its nano/micro scale analytical and measurement capabilities significantly. More than ever before, customers can gain insights and comprehension of what is going on and why it has happened at the nano/micro scale.

Oden Warren's picture

Nanomechanics symposium at SES 2010

Dear Colleague: Please consider submitting your nanomechanics related abstract to Symposium 4-1 ("Nanomechanics: Beyond Modulus and Hardness") of the 47th Annual Technical Meeting of Society of Engineering Science, which takes place October 4-6, 2010 at Iowa State University, Ames, IA. The deadline for abstract submission is 5:00pm CST, Monday, June 7, 2010. The meeting's homepage can be found at www.ucs.iastate.edu/mnet/ses2010/home.html.

Yong Zhu's picture

Mechanical Properties of Silicon Nanowires

In this paper that was published a few months ago, we reported the size effects on the elastic modulus and fracture strength of silicon nanowires. In addition, we observed that the silicon nanowires are linear elastic until fracture with a very large fracture strain up to 12%.

Y. Zhu, F. Xu, Q. Qin, W. Y. Fung, and W. Lu, Nano Letters 9, 3934-3939, 2009

Abstract:

Yong Zhu's picture

Mechanical properties of ZnO nanowires under different loading modes

In this paper, we report the size effects on elastic modulus and fracture strength of ZnO nanowires from the tension, and that the measured (nominal) elastic moduli under tension and bending (from the buckling experiment) are different as a manifestation of the size effects. 

F. Xu, Q. Qin, A. Mishra, Y. Gu, and Y. Zhu, Nano Research, DOI: 10.1007/s12274-010-1030-4, 2010

Abstract:

Cold welding of ultrathin gold nanowires

Nature Nanotechnology, Feb. 14, 2010. DOI: 10.1038/NNANO.2010.4, Yang Lu, Jian Yu Huang, Chao Wang, Shouheng Sun and Jun Lou

NANOVEA's picture

Nanoindentation of Silicon Carbide Wafer Coatings

The fabrication process for microelectronic devices can have over 300 different processing steps and can take anywhere from six to eight weeks. During this process the wafer substrate must be able to withstand the extreme conditions of manufacturing, since a failure at any step would result in the loss of time and money. The hardness and strength of a wafer must be much greater then the conditions imposed during manufacturing to insure a failure will not occur.

Oden Warren's picture

Nanobrücken Nanomechanical Testing Workshop: Feb 24-26, 2010 at INM Saarbrücken

The Nanobrücken Nanomechanical Testing Workshop, Feb 24-26, 2010 at INM Saarbrücken in Germany, aims to bring together researchers from the international nanomechanical community in a forum that highlights both techniques and applications. The workshop features an outstanding lineup of keynote and invited speakers. We cordially invite you to attend and encourage you to participate with a contributed oral or poster presentation.

 

td's picture

Trends in Computational Nanomechanics-Transcending Length and Time Scales

I am happy to announce the forthcoming volume titled Trends in Computational Nanomechanics - Transcending Length and Time Scales 

Postdoctoral Research Associate at the University of Massachusetts Amherst

Choose a channel featured in the header of iMechanica: 

A postdoctoral position is available starting immediately in the area
of mechanics and electronic structure of graphene. The ideal candidate
will have a background in materials science/computational
physics/quantum chemistry with specific expertise in density functional
theory and atomistic simulations. The initial appointment will be for a
period of two years, renewable annually contingent upon satisfactory
performance

Postdoctoral Research Associate at the University of Massachusetts Amherst

A postdoctoral position is available starting immediately in the area of mechanics and electronic structure of graphene. The ideal candidate will have a background in materials science/computational physics/quantum chemistry with specific expertise in density functional theory and atomistic simulations. The initial appointment will be for a period of two years, renewable annually contingent upon satisfactory performance.

Horacio Espinosa's picture

PhD Dissertation Positions in Nanomechanics at Northwestern University

Description
Applications are invited for graduate studies within the Micro and Nano Mechanics Laboratory in the Department of Mechanical Engineering, Northwestern University.  The successful candidate will join a vibrant interdisciplinary research group and be involved in projects addressing atomic scale experimentation and modeling of advanced materials.  We seek motivated, talented and independent individuals interested in pursuing a PhD in one of the following areas:
•    Mechanics of Graphene and applications

Postdoctoral Research Fellow Position in Computational Nanomechanics at the University of Pittsburgh

A postdoctoral research fellow position is currently open in the Computational Nanomechanics group at the University of Pittsburgh for the following research projects in the multidisciplinary areas of computational nanomechanics, nanotechnology, renewable energy, and nanomedicine: 

  1. Hydrogen and bio-sensing nanowire fabrication
td's picture

2nd International Conference from Nanoparticles and Nanomaterials, Rhodes, Greece, June 28 -July 3, 2009

Conference link  May 8th, 2009 -- Abstract Submission
2nd IC4N – 2009 Symposia/Special Sessions on Fundamentals of Nano-materials: experiment, theory and simulation Organizers: Traian Dumitrica (U. Minnesota, USA), Boris Yakobson (Rice U., USA)
 

ChristineOrtiz's picture

PostDoc Position Available at MIT

PostDoc Position Available

Ortiz Laboratory at MIT

Professor Christine Ortiz, Department of Materials Science and Engineering , Massachusetts Institute of Technology, Cambridge, MA, USA

To apply for this position; send cover letter including date available to start, CV, full list of publications, and the names of three references to: cortiz@mit.edu

 

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