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Warner Tjardus Koiter (1914-1997) and his 1945 thesis

Koiter's PhD thesis, dated 1945, gave the birth of post-buckling analysis, and quantified the notion of imperfection sensitivity.  He wrote the thesis in Dutch.  An excellent English translation is free online.

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John Lyell Sanders Jr. (1924-1998)

John Lyell Sanders, Jr., served on the Harvard faculty for a total of thirty seven years and as Gordon McKay Professor of Structural Mechanics for over thirty years from 1964 until his retirement in 1995.  Read the full text of this recently published memorial minute.  

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Vlado A. Lubarda's picture

In Memoriam: Erastus H. Lee

Erastus H. LeeErastus H. Lee, professor emeritus and a prominent researcher, with fundamental contributions to plasticity, viscoelasticity and wave propagation, died at the age of 90 on May 17, 2006, in Lee, New Hampshire.

Open Source Software

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  • This page was started following discussions initiated by Mogadalai Gururajan.
         Here are some links to open source codes/software available on the net; all this information is collected from different posts at iMechanica. It is quite possible that we missed some, and some that are listed are not open source. If so, please feel free to edit the post or leave a comment with relevant links so that we can edit the post.

A general discussion on the undergraduate course on Strength of Materials

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Most departments of Mechanical Engineering, Civil Engineering, and Aerospace Engineering have a required course called variably "Strength of Materials", "Introduction to Solid Mechanics", etc.  In most departments, the content of the coure is mainly about static, elastic deformation of rods, shafts, beams and columns.  It might be a good idea to share your thoughts on this course. 

What sort of conferences do you prefer to go to? Conferences that cover a range of topics or those that are specialized?

Range of topics (e.g. McMat07)
41% (13 votes)
Special subset of mechanics (e.g. Plasticity07)
22% (7 votes)
Whatever I can afford
22% (7 votes)
Only if invited to speak
6% (2 votes)
Conferences are a waste of time
9% (3 votes)
Total votes: 32
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Mahdi Kazemzadeh's picture

"Students Turn"

Here is a hot topic" Overlaps in our knowledge structures " on iMechanica for all of the students!! This belongs to how students iMechanica can be developed or how students can improve it! Please read the comments and let the others know your ideas about this developements. You will find some suggestions there also. With all students ideas collected, there will be a solution to improve current situation for students section.

Henry Tan's picture

Can iMechanica replace mechanical seminars in the future?

Reading the article, future role of iMechanica (node/908) posted by Teng (user/10), I am thinking that iMechanica may replace mechanical seminars, lectures conducted by invited mechanicians, in the future.

Academic seminars have several functions: first, to exchange information; second, to build up connections.

Mogadalai Gururajan's picture

New category for open source codes

Update: An Open Source Review page has been created. Please feel free to leave links, codes and comments on the page. 

Dear Mechanicians,

I have seen that there is lot of code sharing among the mechanicians at iMechanica; a search for the word "code" for example produces nearly fifty entries, of which, I believe, at least half of the posts are pointers to codes and their sharing.

LECAM's picture

Description of fatigue damage in carbon black filled natural rubber

The present paper deals with fatigue damage at the macroscopic scale in carbon black filled natural rubber under uniaxial loading conditions. Uniaxial tension-compression, fully relaxing uniaxial tension and non-relaxing uniaxial tension loading conditions were applied until samples failure. Results, summarized in a Haigh diagram, show that only one type of fatigue damage is observed for uniaxial tension-compression and fully relaxing uniaxial tension loading conditions, and that several different types of fatigue damage take place in non-relaxing uniaxial tension loading conditions.

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Henry Tan's picture

Overlaps in our knowledge structures

Each one of us developed his own knowledge structure. After graduation we followed different research interests, took different projects, and adopted different approaches, analytical, numerical, or experimental. Therefore the knowledge structure is unique for every person, coming from his/her education background and scientific experiences.

There are several levels for the overlapping in our knowledge structure.

MichelleLOyen's picture

North American Workshop on Applications of the Physics of Porous Media

The 7th North American Workshop on Applications of the Physics of Porous Media will be held in Puerto Vallarta, Mexico, November 2-6, 2007. This will be the 7th biennial meeting of researchers around the world who are interested in the phenomena associated with physics of fluid flow and deformation in porous media and its applications to a broad range of basic roblems encountered in geophysics, geomechanics, medical physics, and condensed matter physics.

Full details are available at the website:

Rashid K. Abu Al-Rub's picture

Strain Gradient Plasticity

Recently, there have been many strain gradient theories that are used for the interpretation of size effect at the micron and submicron length scales. The basic idea of these theories is the introduction of a first, or second (or both) gradients of strain or any internal state variable in the governing equations of classical theories.

Zhigang Suo's picture

iMechanica has just upgraded to Drupal 5. Any issues?

After testing for some time, Lesley Lam has just upgraded iMechanica to Drupal 5.  She has tried to make every function exactly the same as before, so that users should not see any abrupt changes.  If you do find any unfamiliar behavior of the new version, please leave a comment below.

Chun Lu's picture

Research Scientist Positions at the Institute of High Performance Computing, Singapore

The Institute of High Performance Computing (IHPC), a member of the Agency for Science, Technology and Research (A*STAR) in Singapore, invites applications for eight available positions for research scientists in the field of theoretical and computational mechanics and materials science. These positions are connected to the A*STAR-sponsored Visiting Investigator Program (VIP) with Prof. Huajian Gao from Brown University as the Principle Investigator.

The development of Crystal plasticity

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Recent experiment have shown the size effect of the materials, when the characteristic length associated with non-uiform plastic deformation is on the scale of micros.The classic plasticity theories can't explain such phenomenon as their constitutive models posses no intrinsic length scale. The new models which contain strain gradient plasticity now are used to explain the experiment.

Seek for suggestions!

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            我是武汉科技大学力学专业04级的本科生, 现在我也准备报考研究生了,力学的方向比较宽泛让人有些迷惑,不知道到底报考 哪个方向比较合适,比较能发挥自己的特长.

Method of Manufactured Solutions

Nowadays, we often use the tools of computational analysis in engineering design. For the results of such analyses to be believable, the tools that are used have to pass rigorous tests. There are two categories of tests involved:

Community Standards for iMechanica

As a moderator here on iMechanica, I have deleted a few posts recently that were clearly spam. As iMechanica grows and becomes more visible within the mechanics community and the broader internet community, we can expect the frequency of these kinds of posts to increase.

Zhigang Suo's picture

Do-it-yourself iMechanica Get Together

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The classes are over. The summer is coming! Rui Huang, iMechanician Number 22, has just arranged an iMechanica Get Together in an evening at McMat 2007, in Austin. Here is a tentative agenda. Please join us if you are in town.

USNCCM Invited Session: Stress Evolution at the Nanoscale

The U. S. National Congress on Computational Mechanics will be held in San Francisco, CA July 23-26 2007 (see link for conference below). As part of the symposium, "Modeling and Simulation of Nano Materials and Mechanics", an invited session discussing stress evolution at the nanoscale will be held. This session will foster discussion of outstanding computational challenges to understanding and predicting stress evolution during growth of materials at the nanometer length scale. Registration information for the meeting can be found via the link below.

Teng Li's picture

IBM Airgap Microprocessors enabled by self assembly (Video)

An earlier post by Xiaohu Liu reported IBM's latest progress in microprocessors. IBM has figured out how to control and perfect the self assembly process to create trillions of tiny, nano-sized holes across a chip, which speed electrons that flow across wires inside the chip and reduce the power consumed by 15 percent.The following short video may help us understand a little bit more about the new technology. More videos, audio and images on this are available here (free, but registration needed)

Enjoy.

-Teng

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