iMechanica

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 .

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.

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:

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. 

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.

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?

hi all 

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

thx

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!

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

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

Phys. Rev. B 80, 165407 (2009), Ji Feng, Liang Qi, Jian Yu Huang, and Ju Li

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:

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.

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/). 

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

A thin film subject to compressive strain can either bend (for large strain gradient) or wrinkle (for small strain gradient). The bending is traditionally used in thermostats (bimetal stripes), but couple of years ago, it was extended to the nanoscale thin films which can bend and roll-up to tubes with defined number of rotations. The wrinkles are also rather common in macro- and microscale thin films.
Here, we developed an equilibrium phase diagram for the shape of
compressively strained free-hanging films by total strain energy
minimization.

Hi all,

If you can pls advise me to modelthis experiment.

First I have applied a constantload for the steel member.

Then I have increased thetemperature of one of the member surface with time

until the member got failed.

This resulted in non-uniformtemperature variation across the section.

I have measured the temperaturesof the different surfaces of the member and

I would like to use thesetemperature values in my structural modelling.

Now I would like to model themember so that I can find out the time

What are the effects of magnetism on stresses while material is under loading condition?Is there any relationship between magnetism and stress?

Thanks!

Shantaram

Hei,

 I am a new learner of XFEM. I want to start some exmaples in ABAQUS. The tutorial in ABAQUS is rather crude. If any body has experience, May I have small notes on how to solve problems with XFEM in ABAQUS?

Thank you for your help.

 Venkat

Reliability of micro-gears is known to be adversely affected by wear. In this work we report a strategy to predict local wear with the aim of predicting their effective life span. For the prediction of local wear we start from the relevant model experiments, choice of a suitable wear model and identification of the wear coefficient from these experiments. This wear model is then implemented in an efficient finite element based scheme to predict local wear.

Expert programmer needed for an exciting project at the University of Minnesota involving the establishment of an online infrastructure for the evaluation of the transferability of interatomic potentials used in atomistic and multiscale simulations. The project called KIM -- the Knowledgebase of Interatomic Models -- is funded through the NSF's Cyber-Enabled Discovery and Innovation (CDI) program. For more information see the attached PDF file. The position is available immediately.