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Nanotube geometry

Hi folks! I deal with buckling nanostructures, contact problem of nanostructures. And i have a problem with geometry construction of nanotube with arbitrary (n, m) chirality. Can any one write the algorithm for building nanotube geometry in 3d space(xyz-Cartesian coordinate system).  Many thanks!

Alex 

ICEM 14 - Poitiers, France, 4 - 9 July 2010

ICEM 14 - 14th International Conference on Experimental Mechanics

 Poitiers, France, 4 - 9 July 2010

 

Extended deadline for Abstracts: 25 October 2009

 

How to calculate the length of element when writting VUMAT for ABAQUS

Hi, everyone!

 Could you please tell me how can I use / calculate the element length when writting VUMAT for ABAQUS?

 Thank you!

Study and Simulation of Tarbela Reservoir with and Without Sedimentation

Tarbela dam is one of the largest
earth filled dam. Tarbela dam lake has height of 485 ft  above the river bed and a reservoir size of
100 sq mi, reservoir capacity. It in
one of the largest man made reservoir constructed in 1970. The importance of
the dam can be realized due to the fact that this dam is on river Indus which
is considered as the backbone of Pakistan in terms of water storage, irrigation
and power generation. Main purpose of the Tarbela dam was to govern the flows
of the Indus River for irrigation purposes. In addition it is one of the
biggest sources of electricity generation. Sediment level at Tarbela Lake is
increasing across the years and there is a need to device methods to stop this

Computing of subdomain integration in Abaqus

I am woring on homogenization with Abaqus for predicting effective properties of composite material, I am using Abaqus to implement  homogenization method, now, I need to compute the stress integration in a subdomain in Abaqus, but I do not know the keyword to do that. Any suggestion is very much appreciated.

 

Thanks in advance

phamhuytuan's picture

Frequency response analysis for solid-liquid system with ABAQUS

  diaphragm by you.

Hello ABAQUS users!

 Do you know how to simulate the resonant frequency for a diaphragm with a liquid medium below as in the figure with ABAQUS ?

Teng Li's picture

Zhigang Suo honored with Humboldt Research Award

Zhigang Suo , Allen E. and Marilyn M. Puckett Professor of Mechanics and Materials at the Harvard School of Engineering and Applied Sciences (SEAS), founder and architect of iMechanica , has been honored with a Humboldt Research Award .

Postdoc Position in Numerical Analysis in Oxford

A position for a postdoctoral research assistant is available, for up to three  years, to work on "the development and analysis of coupled atomistic/continuum models of solids", specifically quasicontinuum and related methods.

Teng Li's picture

Ph.D. Research Positions Available

We invite applications for Ph.D. student positions in the Department of Mechanical Engineering, and Maryland NanoCenter, University of Maryland, College Park. We look for talented and motivated applicants interested in pursuing a Ph.D. degree in one of the following areas:

•    Mechanics of inorganic/organic hybrid nanostructures in flexible electronics
•    Mechanics of graphene-based nanostructures and nanomaterials

Requirements:

Teng Li's picture

Post-doctoral Research Associate Position

A post-doctoral research associate position is available immediately in the Department of Mechanical Engineering, and Maryland NanoCenter at the University of Maryland, College Park, in the area of multi-scale modeling (from atomistic, molecular, coarse-grained to continuum) of carbon-based nanostructured materials. Material properties of specific interest include mechanical and electrical properties, with special focus on deformation/failure mechanisms and bandgap engineering. 

Pijaudier-Cabot and Bazant concept of non local damage

Hello all,

I would like to seek help on a topic on which I am slightly ignorant.

I do not understand the concept of non local damage and the internal length of the non local continuum as described by the well quoted paper of Pijaudier-Cabot and Bazant (1987) in continuum damage mechanics.  So may I please ask the experts in this forum to please explain to me using some simple analogy.

Dependence of relaxation time on the polymer length (via a string of viscoelastic springs)


Dear all,

According to polymer theory, the relaxation time depends on its length (or unit number), and there exist some relationships to describe such dependence. The smaller number of polymer units, the smaller the relaxation time  of the polymer is. How to describe this via a simple model of visco-elastic springs?

Gurson REV CELL PP .......

hi all 

i need more information about : Cell REV Gurson GTN PP Traction Curves ....

thx

 

Need some info about Mechanics and Control of Chatter Vibrations

Can anyone cite some resources for chatter vibrations...the google search results dont throw up good results...I need some thing that will explain the basics - mechanics,causes, measuring and control of chatter in machine tools!

Rui Huang's picture

Excess energy and deformation along free edges of graphene nanoribbons

Q. Lu and R. Huang, Excess energy and deformation along free edges of graphene nanoribbons. Posted online at arXiv:0910.0912, October 2009.

katia bertoldi's picture

Post-doctoral position in solid mechanics at Harvard

A postdoctoral position is available in the area of mechanics of solids and structures. The ideal candidate will have expertise in mechanics of materials, will be creative and willing to explore new ideas.

For additional information, please contact Katia Bertoldi at bertoldi@seas.harvard.edu or visit the website www.bertoldi.seas.harvard.edu

Zhigang Suo's picture

iMechanica has over 16,000 registered users

The number of registered users of iMechanica passed 16,000 early today.  The the number of posts passed 6,900, and that of comments, 12,500. 

iMechanica was founded in September, 2006, with the mission:

  1. to use the Internet to enhance communication among mechanicians
  2. to pave a way to evolve online all knowledge of mechanics

I quote what I wrote when the number of registered user passed 1000 in early 2007:

Yonggang Huang's picture

Professor Huajian Gao will give the Robert Henry Thurston Lecture at the 2009 ASME International Mechanical Engineering Congress

Professor Huajian Gao, Brown University, will give the Robert Henry Thurston Lecture at the 2009 International Mechanical Engineering Congress, Orlando, Florida.  His lecture “Nanomechanics of biological systems - What can we learn from nature about hierarchical materials?” will be in room Euro 10, on the 3rd floor at the Walt Disney Dolphin Hotel (conference hotel), at 10am, November 16, Monday.

cuitino's picture

Post-doctoral position in computational mechanics at Rutgers University

A postdoctoral position is available in the area of multiscale modeling of granular solids. The position is supported by the National Science Foundation and industrial partners of the NSF Engineering
Research Center for Structured Organic Particulate Systems (http://ercforsops.org/). 

Open PhD position: Inverse identification from full field measurements

The part of full field displacement measurements is increasing in
experimental mechanics. Their taking into account relies on the
development of suited identification approaches, which have to be able
to take advantage of their richness. When dealing with composites, they
offer the possibility to perform the identification at a scale where
the material is heterogenenous. The goal of this thesis is to apply
inverse approaches on the challenging case of the identification of
heterogeneous elasticity and develop a robust identification

Nonlinear Buckling of Cylindrical Tubes w/ ANSYS

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Hi all,

I'm trying to run a nonlinear (elastic for now) buckling analysis in ANSYS. Basically I have a thin cylindrical shell (made up of SHELL181). fixed at one end (rigid) and applied force and/or displacement specified on the other end to make it buckle.

I have pretty much tried all options. These were:

i) Linear buckling (Eigenbuckling)

ii) Displacement controlled buckling with a lateral point force to provide eccentricity/imperfection.

iii)Force controlled buckling with, again, a lateral point force (arc-length method)

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