Timoshenko Lectures

Listed in this post are the speeches given upon receiving the Timoshenko Medal.  Every November, at the Annual Applied Mechanics Dinner, the medalist of the year delivers a speech. Taken together, these speeches provide a long perspective of our field, as well as capsules of the lives of extraordinary individuals.

How to set the element coordinate system for truncated cone composite shell in Ansys ?

Hello, everyone! 

Now, I'am trying to analysis a truncated cone composite shell subjefcted to compression load in Ansys. But I don't know how to set the element coordinate system. I want to set the circumferencial direction as fiber direction, and the thickness direction and generatrix direction as transverse direction. Can any one teach me how?

Thankful to any adivice? 

Dry Gas Seal Primary vent suction perssure HI Hi


We have installed new gas compressors solar titan 130 turbines
driven. Unfortunately, we have problem of primary vent suction pressure for dry
gas seal (John Crane) Hi Hi.

Our operating parameters are:

Compressor suction pressure: 60 bar.

Compressor suction temperature: 40C.

Please support "Theoretical and Applied Mechanics" at Stack Exchange

Hello everyone,

I've proposed a new Stack Exchange site called "Theoretical and Applied Mechanics" for people intersted in mechaics related issues.  The current link is

For the proposal to be accepted to go to the next stage the site will need the  following:

- 60 people to follow the site

- 40 questions that are relevant to applied mechanics with a score of 10 or more.

tigerofmahdi's picture

I need this book.

I need this book highly. 

anyone have PDF of this book?


"Impact strength of materials" by W.Johnson 

Journal Club Theme of March 2014: 3D Experimental Measurements in Soft Materials

3D Experimental Measurements in Soft Materials - from measuring cell displacement fields to complex hierarchical material deformations and beyond

The Why? - Why do we need 3D material deformation measurement?

This is an excellent question. If material surface deformation field descriptions are of prime interested, then Digital Image Correlation and interferometry techniques provide the user with a mature field available experimental approaches that might fit the bill [1]. However, if the material of interest presents itself with an internally non-homogenous, non-periodic or simply 3D microstructure, 3D internal deformation measurement techniques might be the only way to investigate the material’s deformation, and ultimately its constitutive behavior.

Matlab Code for Material modelling

Hi all,

 I want to write a matlab based code that will be able to describe material behaviour under uniaxial loading. So what I am interested in is the plasticity of a material. I want the code to be able to represent material behaviour after yielding and also cyclic loading.

After my literature review I was able to come to the conclusion that Armstrong and frederick and also Chaboche Model could be used to describe the material behaviour. What I wanted to know was if anyone has done something like this and could comment on the level of difficulty involved in this process. I have a timescale of 2 months and wanted to know if it is possible. Let me know any guidance you can provide will be much appreciated.

Pradeep Sharma's picture

Liping Liu is the recepient of the 2013 Eshelby Mechanics Award for Young Faculty

It gives me great pleasure to announce the outcome of the 2013 competition for the Eshelby Mechanics Award for Young Faculty. This award is given annually to rapidly emerging junior faculty who exemplify the creative use and development of mechanics. The intent of the award is to promote the field of mechanics, especially among young researchers. The selection committee consisted of: K. Ravi-chandar (UT Austin), Huajian Gao (Brown University), Kaushik Bhattacharya (Caltech), Roger Fosdick (Minnesota University), and Yonggang Huang (Northwestern University).

The award consists of $ 1500 cash and a commemorative plaque. The receipients are honored at the ASME Applied Mechanics Banquet.

tigerofmahdi's picture

Which is older??

hi every body:

What's your idea?  The virtual displacement is special case of hamilton's principle or the hamilton's principle come from virtual displacement?  Or, Which is older?

Residual stress theory measurement new NDT.


Residual stress theory measurement new NDT.


Vicky Nguyen is named Editor of the iMechanica Journal Club

vicky NguyenVicky Nguyen, of the Johns Hopkins University, is named Editor of the iMechanica Journal Club.  Vicky has a broad vision for mechanics, and has made contributions to diverse topics.  in 2008, she received the Presidential Early Career Award for Scientists and Engineers.  In 2013, she received the Sia Nemat-Nasser Early Career Award and the Eshelby Mechanics Award for Young Faculty.

The mission of the Journal Club is to facilitate discussion at the frontier of mechanics and its applications. 

To enable the discussion, each month an Editor selects a Discussion Leader, who in turn posts a Theme.  The Theme stays at the top of the front page of iMechanica for the entire month.  See Recent and Past Themes, and the Operating Notes for the Journal Club.

Vicky will share the responsibility of editing the Journal Club with Xuanhe Zhao.  Feel free to contact either of them if you have an idea for a theme, or if you would like to volunteer a colleague.

  • Email Vicky Ngyen:
  • Email Xuanhe Zhao:

Yonggang Huang's picture

Professor Ares Rosakis elected as a Foreign Fellow of the Indian National Academy of Engineering

Professor Ares J. Rosakis is elected as a Foreign Fellow of Indian National Academy of Engineering.

Carbon-epoxy composite plates with edge crack modeling by FRANC 2D/L

Hi, All

 Can someone help me for modeling composite plate contaning edge crack by FRANC 2D?

thank you


Abaqus Standard /General contact with penetration

Dear Colleague, 


I am running Abaqus Examle Problems Manual 1.1.18 - The self contact on rubber gasket.  


I tried to convert the self contact and surface contact definition to a general contact definition. However, the rigid surface just penatrate the model like this shown below.


Left image is the result for the inp from manual. The right one is the result for compuation with general contact.


Does somebody here want to discuss or maybe explain this for me ?


Thank you in advance. 


Abaqus "system error code 884"

Hello again


Im running a simulation on Abaqus and i got the next text message:


Abaqus Error: The executable C:\SIMULIA\Abaqus\6.11-PR3\exec\standard.exe 

aborted with system error code 884. 

Please check the .dat, .msg, and .sta files for error messages if the files 

exist.  If there are no error messages and you cannot resolve the problem, 

please run the command "abaqus job=support information=support" to report and 

save your system information


 do you know what is this error? ive been looking on ABAQUS documentation and in the web and i cant find information


Pradeep Sharma's picture

Call for Nominations for the Eshelby Mechanics Award for Young Faculty

It is my pleasure to solicit nominations for the "Eshelby Mechanics Award for Young Faculty". This award, launched last year, is given annually to rapidly emerging junior faculty who exemplify the creative use and development of mechanics. The intent of the award is to promote the field of mechanics, especially among young researchers. While interdisciplinary work that bridges mechanics with physics, chemistry, biology and other disciplines is encouraged, the ideal awardee will demonstrate clear inspiration from mechanics in his/her research.

The award will consist of $ 1500 cash and a commemorative plaque.

lbergman's picture

ASME Applied Mechanics Division Call for Award Nominations

The Applied Mechanics Division seeks nominations for the awards listed below. All awards are international. Each nomination should include a nomination form and 4-5 letters of support, as described in this document.  Each nomination should be emailed as a single PDF file to the Chair of the Applied Mechanics Division, Bergman, Lawrence A ( 5 November 2012. The subject line of the email should contain the words“AWARD NOMINATION”, the name of the award, and the name of the nominee.  This deadline is firm. Nominations submitted after this deadline will be considered for the subsequent award year.

hello , in NGUYEN V 's 'An Object-Oriented approach to the Extended Finite Element Method with Applications to Fracture Mechanic

hello , in paper :An object-Oriented approach to the xfem with Appications to fracture mechanics, in page172, the matlab code :mshmlab.m.

when i run the code mshmlab.m , this problem occured:

 ???Maxmium recursion limit of 500 reached, when i set(0,'recursionlimit',N).N=5000. the matlab crashed,

how to address this issue? 

lucadeseri's picture

ERC Advanced Grant 2013 to Professor Davide Bigoni

Join us to congratulate Professor Davide
Bigoni, who has just been awarded with the ERC Advanced Grant
Proposal 340561 - Instabilities and nonlocal multiscale modelling of
materials, years 2014-2018, 2.4 M.

Congratulations Davide!



More on Davide's research:






I am working on a tube that is called "detonation tube". I am studying the vibrational response of this tube to moving pressure loading(tube). This type of loading is repeted in many steps. I made a FE model of it in Abaqus. Otherwise, I have an analytical solution, but my results in nalytical solution is different from that in Abaqus. Actually, there is damping in results of FE model of detonation tube. It seems that this damping is artificial. In addition, the results in the first steps of loading profile is similar. How can I remove the damping effects in Abaqus? Please help me.

Thank you.

Change of basis for deviatoric second order tensors

Dear mechanicians
I remember reading somewhere that someone had a proof of the following:
Given a deviatoric/traceless second order tensor it is possible to find a basis for which all the normal/direct components equal zero.
For 2d this is easy: a basis rotated 45deg wrt. the eigenbasis.
The proof concerned 3d and it may have been Gurtin that had it in one of his books (sometihng tells me "The Linear Theory of Elasticity" (1972) as I don't have access to this one), but I'm not certain.
Can anyone help me in this matter?

Thermomechanical coupled simulation

Hi all,


I am trying to input a termperature field as initial conditions in
abaqus, to use the temperature distribution from a previous temperature
simulation in an mechanical simulation. But when I check the Temperature
values in the mechanical simulation i get great differences between the
nodal values (NT) and the element values (TEMP).

Does anybody know the reason of this problem?


Can it be related to the element typ? So the TEMP values are the avereged values from NT?


Kind regards!

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