Immersed in an ionic solution, a network of polyelectrolyte polymers imbibes the solution and swells, resulting in a polyelectrolyte gel. The swelling is reversible, and is regulated by ionic concentrations, mechanical forces, and electric potentials. This paper develops a field theory to couple large deformation and electrochemistry. A specific material model is described, including the effects of stretching the network, mixing the polymers with the solvent and ions, and polarizing the gel. We show that the notion of osmotic pressure in a gel has no experimental significance in general, but acquires a physical interpretation within the specific material model.

Hi all,

I have taken up this research project/attachment on
"characterising the fracture toughness of epoxy using mechanical
fatigue", and encountered lot's of problems while researching. I'm just
a student, not even in university, but rather still schooling (grade
10), so am completely new to this field, which explains my problem in
understanding all the lit reviews, lecture slides i found online.
Luckily, i found out this site, and would hope that someone can guide
me in the right direction!

Congratulations to the winners of the 2009 Awards:

• Pradeep Sharma wins the Thomas J.R. Hughes Young Investigator Award
• Eugenio Oñate wins the Ted Belytschko Applied Mechanics Award
• Stephen H. Crandall wins the Thomas K. Caughey Dynamics Award
• James R. Barber wins the Drucker Medal
• Stelios Kyriakides wins the Koiter Medal
• Zdenek P. Bazant wins the Timoshenko Medal

All awards will be presented at the Applied Mechanics Annual Dinner, on Tuesday, 17 November 2009, in Florida, at the ASME International Mechanical Engineering Congress & Exposition.  Join us to congratulate the winners, celebrate mechanics, and renew friendship.

Related post:

Call for nominations for the 2010 Applied Mechanics Awards

EMI, the Engineering Mechanics Institute of ASCE, will hold its annual conference on August 8-11, 2010 at the University of Southern California in Los Angeles, CA.   Dr. Roger Ghanem (Department of Aerospace & Mechanical Engineering) and Dr. Amy Rechenmacher (Department of Civil and Environmental Engineering) will be the Co-chairs of the EMI 2010 Conference.

I am doing a modal analysis of a 3 D frame.The expected fundamental natural frequency was above 1000Hz.I selected Block Lanczos method as analysis option.The start frequency and end frequency in the appeared window was not given.The fundamental frequency I obtained was very less(about 40Hz) than the expected value.Later,I changed the start frequency and end frequency to 1000Hz and 25000Hz respectively.Then,I got the result as 1018Hz.I want to know whether we should give the start frequency and end frequency?From my experience,I got the idea that if we are not giving those two values,the result obtained will be wrong.Please give me a solution

Hi,

 I am trying to learn a software for geomechanics modelling. I used to run my own codes. Can anyone tell me which one is better for geomechanical modelling between FLAC and ABAQUS?

 Recently, I notice that many people are learning COMSOL, which is a multiphysics modelling software. How about its mechanical capability?

 Thanks in Advance.

 Yongnuan

Zanaboni  Theorem  Is  Not  True

Hello,

I am planing to model a viscolestic material in ANSYS and condition is dynamic.

Could anyone please suggest what are the essential things (i mean datas) required for modeling a viscoelastic material?

For example, If I do the DMA test of viscoelastic materials i can have the modulus data at different frequencies. How to use those data in ANSYS to find out the stress-strain curve?

Thnaks for your kind help

parimal maity

Dear professors

 Could you please help me to get an MATLAB code for non linear analysis of simply supported beams please.

Email me on; kazitani_nabil@yahoo.fr

Best regards

Colleagues

Can I draw your attention to a Chair position and Lectureship in Bioengineering at the School of Engineering, Durham University. While the curent Chair position is occupied by an experimentalist, the postitions are open to candidates with interests in computational modelling and I would encourage anyone in that area to take a look.

Further details are available at the Durham jobs website https://jobs.dur.ac.uk/default.asp. Closing dates are 10/07/09 for the Chair and 31/07/09 for the Lectureship.

Charles Augarde 

NSF-DFG-Project

Materials World Network: Multi-Scale Study of Chemical Vapor Infiltrated C/C Composites

The Institute of Engineering Mechanics, Chair of Continuum Mechanics, Karlsruhe University (TH), Germany, offers the position of a

Scientific Employee

to work on a special research project within the frame of the NSF-DFG Project Materials World Network: Multi-Scale Study of Chemical Vapor Infiltrated C/C Composites. The position offers, as well, the opportunity to receive a PhD.

Job description
A Postdoctoral Fellow position is available in the Computational Solid
Mechanics Laboratory in the Division of Physical and Chemical Sciences
and Engineering at King Abdullah University of Science and Technology
(KAUST). Candidates with experience in the following
research area are encouraged to apply:

(1) Constitutive modeling of soft materials (biological tissues and polymers)

Qualifications
A successful candidate must have a Ph.D. in the field of computational
solid mechanics with experience in the aforementioned
area of research. Programming experience on a UNIX platform is a must.
Other related areas of research will be considered.

Hi there,

 I am sure a lot of you have been using ABAQUS to define cohesive elements. I have seen a lot of forums here and a lot of them specified the Alfano 2001 paper as a great reference. Here is the title of the paper incase anyone is wondering which paper:

G. Alfano and M.A. Crisfield, Finite element interface models for the delamination analysis of laminated composites: mechanical and computational issues, International Journal for Numerical Methods in Engineering 50 (2001), pp. 1701–1736. 

 ABAQUS itself uses this paper to describe its usage of cohesive elements.

Dear Colleagues,

The next *WCCM 2010* (World Congress in Computational Mechanics)
Conference will be held in Sydney (AUSTRALIA) on July 19 - 23, 2010.
Within this conference, Stephane Bordas and myself are organizing a
minisymposium dedicated to ...

"Novel discretization techniques for moving discontinuities and
singularities". You can download some explanatory text on the topics
and methods in the file uploaded to the "files" part of this group. We
invite you to submit a paper as part of this symposium. Strong
contributions will make this session a success and we are grateful in
advance for your participation.

You can download a pdf file of this announcement.

The Applied Mechanics Division, of the American Society of Mechanical Engineers, seeks nominations for the awards listed below. All the awards are international.  Neither the nominee nor the nominator need be a member of the ASME.  Further descriptions of the awards are given at http://divisions.asme.org/amd/Honors_Awards.cfm.

(1) Principle of virtual work statement can be said as:

"Virtual work = Work done by real forces in moving through virtual displacements
                        = (Real Force) * virtual displacement
 
Therefore, the equation of virtual work that you get is:
F * du = (K*u) * du (where, du is the virtual displacement and u is real displacement, and Ku is the real internal force and F is the real external force)
 
(2) However, I was going through the lecture notes of Duke university, we have at the following URL:

Hi,

I am working on a coupled fluid structure problem , precisley on the elasto-acoustic mode, of a system consist on a cube which define the fluid domain coupled with an elastic plate.

The boundry conditions is:

- all the face of the cube is regid only the face coupled with the plate

Halmstad University (Sweden) is looking for young researchers to join our research groups in embedded and intelligent systems, specifically for intelligent vehicles in joint work with Volvo Technology in Gothenburg. Two positions are currently open: one with a focus on vehicle diagnostics, maintenance and uptime, and one with a focus on autonomous vehicles. Please se advertisement at: http://www.hh.se/english/abouttheuniversity/vacantpositions.2064_en.html (click on link Assistant Professors in Information Technology)

Hi

I am modelling a contact problem using Abaqus and I am trying to use remeshing hoping to get more accurate results in critical locations. But I encounter following error:" the area of 7 elements is zero, small or negative". Despite of the definitions of the remeshing rules always the error message appears when size of elements  is quite a small. My goal is to get minimum element size 1E-7m in critical location. The error message appears much before that goal. I am very grateful if someone could help.

A Ph.D. position has recently become available in my research group (www.eng.uwyo.edu/mechanical/research/frick/), to explore thermo-mechanical
behavior of shape memory polymers for biomedical applications.  A
strong candidate with a M.S. or B.S. degree in Mechanical Engineering,
Materials Science, or a related discipline is required.  A good
academic record, a clear interest in experimental sciences, and an
enthusiasm to conduct outstanding research are the only prerequisites.
Prospective candidates should contact me (cfrick@uwyo.edu) for additional information.

Does anyone have experience using poroelasticity model? I dont underestand the abaqus model -the logarithmic bulk modulus and.., where are these coming from?Is anyone knows a reference book to link those?

Hello everyone, I am useing the CZM method researching the dynamic crack propation problem in composites,so I must have the UEL OR VUEL of cohesive zone elements in ABAQUS or other FEM software,at this moment,  i have a UEL of ABAQUS,so i have a question ,if i want to simulate the dynamic crack problem, can i use the UEL? Or must write my VUEL?

Everyone answer is welcome

If some people have the same researching plan ,we can communicate each other!

EMAIL:liuluguangwindows@msn.cn

Thanks

I have a question, for the same metal material, when will the elastic modulus will be changed? in another words, in what kind of processing or machine condition will the elastic modulus be changed? for example, to machine elements(gear, bearing ...), when the part surface is case hardened,will the elastic modulus be changed? if not, how can the difference of hardness between case hardened surface and without hardened substrate be reflected in FEM analysis? how can the case hardened surface parameters affect the contact stress when two part are brought to contact?

and a further question about this topic is will Carburizing and nitriding treatment change the elastic modulus of metals?

Thank you, for you help very much!

dear all

i am trying to model droplet impact and spreading and i am thinking of using comm code CFX for this purpose

Can CFX handle this sort of problem?  or if some one  can help me out with an alternate

thanks