iMechanica

Dear all,

I need an Abaqus UEL for von Mises plasticity as sample to learn how to write a UEL for plasticity. Does any body have any similar UEL code?

Thanks,

Hadi

There are 3 fully-funded PhD studentships available for a 1st October 2009 start, for EPSRC-eligible students in Mechanics of Materials at Imperial College London. EPSRC eligibility usually entails UK citizenship.

I am sure that several of you have followed Mr. Koenemann's posts with some interests.  For some it might be entertainment, and for others it might be like watching a car wreck.  In any case, several iMechanicians have attempted to convince Falk that his theories do not make sense.  We have all failed miserably at that task.  I am perhaps a bit slower than most, but it is clear to me that Mr. Koenemann will not be convinced by any physical or mathematical arguments.  So I am left with the ultimate arbiter of all theories, experimental measurement and observation.

The 31st CONFERENCE and the 25th SYMPOSIUM of the International Committee on Aeronautical Fatigue is hosted in Rotterdam, The Netherlands, by the National Aerospace Laboratory NLR, under the auspices of the Netherlands Association of Aeronautical Engineers NVvL, the Technical University of Delft and Stork Fokker AESP B.V.

hi all,

 I am trying do analysis on a beam in ABAQUS which is coated with polymer meaterial and i have to test it in following conditions,

1. Humidity resistance: 50 ° C/85 ± 4% RH for 8 days

2.  Warm salt water: 58 ± 2° C/5% salt-water immersion for 8 days

can anyone tell me how to do this one...

Regards

sagar

Hi everyone,

Does anyone have the work experience on stepped column kind of structure?

I would like to know, how to determine the crippling load for stepped column kind of structures? If anyone have the materials pertaining to the subject, please do share (if interested).

Thanks and Regards

M Gopalakrishnan.

Hi every one,

 I am in my final stage of my dissertation, which is about slamming analysis of boat hulls with help of CEL - in Abaqus. I am currently working in how to validate the results which I got. Is there any way except experimental method to validate the stress - strain results?

Please help me...

 Regards

Kunal Baxi

M.E.- CAD/CAM

Job Summary

Cell sensitivity to substrate stiffness

Submitted by Daniel Isabey on Wed, 2009-04-15 15:03.

In Féréol et al. (Biophys. J., 2009, 96: 2009-2022),
we propose a coupled theoretical and experimental study in order to understand the
mechanism of cell sensitivity to substrate stiffness. To do so, we first consider
that adhesion sites pass through different stages of development, e.g., Initial
Adhesion (IA), Focal Complex (FC), Focal Adhesions (FA), characterized by the

The Penn State Biofunctionalized Nano-Electro-Mechanical-Systems (BioNEMS) Laboratory (http://www.esm.psu.edu/huang/) is actively recruiting highly motivated, qualified Ph.D. students. 

We welcome students trained in the following fields: Mechanical Engineering; Electrical Engineering; Chemical Engineering; Chemistry; Biology; Optics; Material Science; Bioengineering; Physics.

Oppurtunity for experience scientist and professors at

Council of Scientific & Industrial Research [CSIR]:

 http://www.csir.res.in/

http://www.nature.com/naturejobs/science/jobs/93864-Outstanding-Scientists

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Hello everyone,

 Why do we have the infinitesimal (linear) strain tensor to be symmetric? The reasons, which I have understood so far are:

1. It is defined to be symmetric so that it behaves like a tensor.

2. The stress tensor, which is its energy conjugate, is symmetric, and hence the skew-symmetric part has no contribution towards strain energy.

 Can anyone suggest more fundamental reason(s) for the symmetry of linear strain tensor, like the moment equlibrium leading to symmetry of the Cauchy stress tensor?

Thanks in advance,

Hi everyone, 

Sometimes while replying for the answered queries, I face the issue of "COMMENTS FIELD IS REQUIRED" inspite comments field is filled. I have attached the same in the presentation. Please go through it help in this regard.

Thanks and Regards
M Gopalakrishnan

Hi all,

 I am working on simulation of necking in a uniaxial tension test using sheet specimens of 1 mm sheet thickness. I have given stress strain data upto a plastic strain of 1 , I am using 4 elements in the thickness direction of the sheet.My job is able to complete but with lot of warning messages as follows:

1) The strain increment has exceeded fifty times the strain to cause first yield at 286 points

2) The system matrix has 174 negative eigenvalues.

I am doing analysis in ANSYS which requires the contact pair to be defined. I am unable to select an appropriate value of Pinball region, Penetration Tolerance and normal penalty stiffness. Does any body have an idea how to select the good values for better solution? If you have anykind of material related to contact pair kindly email me at hijazi.19@gmail.com

 Thanks

Dear Prof.Barber,

     This is the proof of the theorem I mentioned before. This proof is recorded in a book

  (titled as variational principle in elasticity and its applications)  written by Prof.Hai Chang Hu, one of the inventors of the well-known Hu-Washizu generalized variational principle. It is written in Chinese. I translated it into English. Of course, all errors and misunderstandings are due to me. I think this proof is elegant and accessible to most of the students with engineering background.

  Hope it helps

Hi Every one

Greetings!!!

 I am a new entrant to this site. This site seems to be very good towards technical aspect.

First of all I would like to introduce myself. I am a Ph.D student working in the area of fatigue.

- Is there anyone to support and share the knowledge in the domain of fatigue?

- Can anyone guide towards the websites that provides very good information about fatigue and related literatures.

Thanks and Regards

Gopalakrishnan Mohanam

Dear all,

do you know does any entry stored is STATEV, used in UMAT subroutine,
should remain unchanged for the next increment for the case of finite
deformation?
I know that STRESS and STRAN  will be rotated by ABAQUS but what about the STATEV?

I want to protect STATEV from any rotation by ABAQUS in order to rotate
it in UMAT by my rotation matrix but I am experiencing that it is
different value at the beginning of new increment in comparison the one
as output from previous increment.

Thanks in advance,

Marina.

Location:  Colby-Sawyer College, New London, NH, United States
Sunday, July 26, 2009 - Friday, July 31, 2009
Chair:  Jeffrey T Koberstein (Columbia University)
Vice Chair:  Chung-Yuen Hui (Cornell University)
Web Site:  http://www.grc.org/programs.aspx?year=2009&program=adhesion

Online Application:  http://www.grc.org/application.aspx?id=13784