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The efficiency of turbines

Mon, 2007-09-10 09:56 - Ajit R. Jadhav
education
fluid mechanics
students
brain-teaser
turbines
hydro-electricity

Hello students (and also others) at iMechanica,

Last weekend, while channel browsing on TV, I happened to notice a documentary on the Hoover dam (in the US). It showed a number of jets of water, huge ones, forcefully springing forth out of the rock faces just downstream of the dam. These were the water jets coming off the electricity generation plant of the dam, *after* their job of generating electricity was already over.

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MichelleLOyen's picture

Graduate students and publishing

Sat, 2007-09-01 15:45 - MichelleLOyen
education
publishing
students

I just stumbled on this very interesting discussion on why science graduate students should publish, regardless of their later career intentions.  I agree with the author on most points, but believe it really comes down to two things: (1) if you aren't going to communicate your results (both good and bad!) then you might as well have not bothered to do the work, and (2) becoming a good writer is a skill that every technical person will need in any career.

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modelling of friction welding process using abaqus

Wed, 2007-08-29 11:04 - venkat_dsk84
education

I am a postgraduate student studying in india.I am doing my project in friction welding . I have to create a finite element model of friction welding process and then simulate it to get the shortening distance.I am new to ABAQUS so help me by sening the procedure for creating a finite element model of friction welding process and then simulating it .

My E-mail address is

VENKAT_DSK84@YAHOO.CO.IN

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hmdthr's picture

Theoretical Notes (ALE)

Mon, 2007-08-20 16:43 - hmdthr
education
students

Hello,
 I need some detailed informations about topics below:
 Single material ALE
 -Advection schemes
 -Mesh smoothing algorithms
 Multi-material ALE
 -Volume fraction weighted stress
 -Interface reconstruction
 -Moving mesh techniques
 FSI
 -Constraint based method
 -Penalty based method
 -Leakage
Can anybody help me?

Thanks alot

 

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Henry Tan's picture

MACE-11010 Engineering Mechanics

Thu, 2007-08-16 07:24 - Henry Tan
education
students
Tan's lecture notes
Engineering Mechanics

You are always welcome to visit my office (B14/Pariser), call (0161 306 8970), or email (henry.tan@manchester.ac.uk).

Grading System

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Gopinath Venkatesan's picture

Interesting Material: d3o

Sun, 2007-08-12 12:32 - Gopinath Venkatesan
education
students

I came across this web page recently, and it talks about a novel product d3o that can control impact effects by adjusting molecular structure in case of shock loads. If this material becomes a regular apparel material, we may see many Jackie Chans in the future. The material is d3o.

Visit this page to learn more about this material, This is not a SPAM. http://www.d3o.com/index.php

I don't know if you guys knew of this. I guess you do. Is this material really the way it is advertised, or some boasting included?

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shengke zhi's picture

Looking for suggestions and comments on PhD research Project

Thu, 2007-08-09 06:27 - shengke zhi
education
condition monitoring
laser techniques
Instantaneous Angular Speed
Non-contact measurement

Dear Researchers and Industry Engineers, 

In this letter I am looking for some comments and industrial supports for my PhD research on non-contact measurement for machinery maintenance.

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coupling between plasticity and damage

Wed, 2007-07-18 11:50 - nilesh
Forums: 
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education

Hello all,

 I am Nilesh and doing
study of Continuum damage mechanics, in that context, I have some doubt s

     Can anyone tell
me?

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yoursdhruly's picture

Sih's Strain Energy Density Approach in Fracture - why is it not very popular?

Fri, 2007-07-13 15:46 - yoursdhruly
education
fracture
strain energy density
Sih

Most fracture classes and texts focus on the following different approaches: Griffith's energy approach, Irwin's stress intensity factor approach, the Barenblatt-Dugdale strip yield model (and subsequently, cohesive zone modeling) and Rice's J-Integral approach. As a graduate student studying fracture mechanics, I have often wondered why there seems to be very little discussion in the community with regard to Sih's strain energy density approach. Are there any fundamental limitations to the approach or are there "other" reasons behind this? Your thoughts are appreciated.

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atmaca's picture

post doct.

Fri, 2007-07-13 10:01 - atmaca
Forums: 
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education

How can i make post doc. in another country?

How can i follow post doc positions available in europe or america? 

 

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msd.jacob's picture

stress singularity and stress relationship

Fri, 2007-07-13 07:15 - msd.jacob
education

Dear All 

Williams analysis is well known for stress singularity. Actually when we are analysing the stress distributions between two diffrent configuration which is given below ,based on the stress singularity, I got a doubt...how the order of stress singularity is directly related with the stress. (we can get the relationship using equation) however if i want to explain to a student who never come across with applied mechanics. How can we explain to him in very simple and understandable manner.   

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Xuejun Fan's picture

New Book - Mechanics of Microelectronics

Thu, 2007-07-12 17:19 - Xuejun Fan
education

You may want to take a look of this newly published book entitled Mechanics of Microelectronics, which is

Series: Solid Mechanics and Its Applications , Vol. 141

Springer, May 2006

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Zoeb Kaizar Lakdawala's picture

mapped meshing model having a crack in ansys

Thu, 2007-07-12 11:44 - Zoeb Kaizar Lak...
Forums: 
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Choose a channel featured in the header of iMechanica: 
education

hi,

 

i am student of M tech 2nd year and working on fracture mechanics one of the problems i am encoutaring is that my model is a rectangular plate and having a central hole with a crack now problem is that i can not mapped mesh the model in ansys can anyone tell me how to map meshed the model.

 

Regards

zoeb lakdawala

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Henry Tan's picture

Instructional Design and Technology

Tue, 2007-07-10 10:25 - Henry Tan
education
instructional design and technology
e-learning

Some topics on instructional design and technology may benefit iMechanica.

• New possibilities and proven practices: teaching with blogs, wikis, and discussion boards
• Critical approaches to teaching with technology
• Teaching with podcasts
• Designing and developing e-learning materials: when and where should teachers invest in design
• Multimedia: value, depth and access to other learning styles
• Supporting teaching and learning with mobile technologies
• The art of supporting educational technology: opportunities & challenges

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msd.jacob's picture

parallel computing and future

Thu, 2007-07-05 02:28 - msd.jacob
education

I am new to parralel computing and trying learn basic. wat are the languages can we use for coding in parallel computing. Can any one give me an example for this. Any resource link will do?

Tks in advance

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karthi's picture

Guidelines

Tue, 2007-07-03 15:50 - karthi
Forums: 
Fracture Mechanics Forum
Choose a channel featured in the header of iMechanica: 
education
Free Tags: 
project
Thermal fatigue

HI all

     I am Karthikeyan pursuing my
M.S in Rotating Machinery Design. Its high time for me to take up the
project. So I decided to take my project in Fracture or Fatigue. I am
interested in Thermal fiels also. So I would like to do my project in
Thermal Fatigue fracture side. So I would like to get your suggestions
and some topics to take out work.

    I am
interested in coding also so if anybody give guidelines to develop an
element for this analysis then I will be grateful for them.

 

With Regards

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Hypoelastic-plasticity with logarithmic spin

Tue, 2007-07-03 15:42 - Biswajit Banerjee
education
hypoelastic
plastic
logarithmic spin

In small strain elastoplasticity we start off with an additive decomposition of the total strain into elastic and plastic parts. In terms of strain rates we write

$\displaystyle \dot{\ensuremath{\boldsymbol{\varepsilon}}} = \dot{\ensuremath{\boldsymbol{\varepsilon}}_e} + \dot{\ensuremath{\boldsymbol{\varepsilon}}_p}.<br /> $

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Derivative of Logarithmic Strain

Sun, 2007-07-01 20:21 - Biswajit Banerjee
education
derivative
tensor
logarithmic strain

Some of you probably work on problems that involve moderately large strains. An useful strain measure for such problems in the logarithmic or Hencky strain. In particular, if you deal with the numerics of large strain simulations, you will often need to compute the material time derivatives of logarithmic strains.

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Ashfaq Adnan's picture

Natural Frequencies for all elements in the Periodic table.

Sun, 2007-06-24 21:08 - Ashfaq Adnan
education

Hi, 

I am interested to know the natural frequencies of elements in the periodic table. I made some attempt to reveal this information but surprisingly ended with nothing. Perhaps I  did not search hard. Does anyone know about the natural frequencies of elements in periodic table.

 

Sincerely,

-Ashfaq Adnan

Doctoral Candidate, School of Aero and Astro, Purdue University, Indiana

 

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msd.jacob's picture

Abaqus CAE with dynamic explicit/implict

Tue, 2007-06-19 01:48 - msd.jacob
education

I want to get the stress value in the roller of a hot/cold worked plate. Both the roller and the plate are defrormable 2D shell model. The change in the thickness of the plate is 0.05mm once the plate  passes throguh the rolees.I am trying to use dynamic explicitt in the step process. PLease advice me wat are the other factors i have to input for the dynamic explicit process. I am having some more input for the roller and the plate velocity.

Please advice me or just ask me for further input. Thanks for your mehaniciams feed back.

Jacob

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