# education

## stress singularity and stress relationship

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.

## mapped meshing model having a crack in ansys

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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

## Guidelines

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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

## Natural Frequencies for all elements in the Periodic table.

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,

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

## Abaqus CAE with dynamic explicit/implict

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.

Jacob

## Question regarding applicability of J-integral in LEFM

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hi,

I am a Student of 2 year M. Tech. studying in S. V. National Institute of Technology, Surat. My name is Zoeb K Lakdawala. My topic for disseration is ''Implemenation of Fracture Mechanics on Pressure Vessels". In my disseration I want to develop a code on fracture mechanics and compare it with standard Packages like ANSYS & ABAQUS

However, going through the books I have found that in

1. Plane Strain Mode the thickness of the material is very high

## Physical Interpretation of Strain decomposition

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## Heart geodesic

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Hello

I would like to ask if anyone work about geodesic in the left human ventricle. If Yes, I wanted to ask what is the role of the geodesic.

Michael Borowicz

## Griffith

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I teach Materials Science to undergraduate engineering students. We devote 2 or 3 lectures on Fracture where we mainly introduce Griffith's formula and the stress intensity formula. I face a difficulty in reconciling the two which I would lke to present here.

The Griffiths equation gives the fracture stress s for a given crack size c:

s=sqrt[2 E g/ (p c)] (1)

The stress concentration formula gives the max stress at the crack tip as

s=s0 [1+2 sqrt (c/r)] (2)

## G. R. Irwin: the father of Fracture Mechanics

Technology, Law and Insurance, Volume 2, Issue 1 March 1997 , pages 43 - 47

## damage mechanics

Hi , I am a  working on a project of  Continuum Damage mechanics in Composite . But  I do not have much idea about Damage mechanics . I am getting lot of diffculites to understand this topic .

So please  anyone let me know any basic literature, lecture notes where I can find all basic information about Damage mechanics .

Regards.

## Cell mechanics workshop at University of Illinois with NSF fellowships

Apply for NSF fellowships to attend 1-week long workshop on cell mechanics, July 31-Aug 3, 2007.

Check out www.ccm.uiuc.edu