I have one very simple question regarding ANSYS-AUTODYN and LS-DYNA. It seems that both can model impact loads.

My
questions is which can model low-velocity impacts and which can model
high-velocity impacts. I have some troubles modelling low-velocity
impacts in autodyn (changing the mass of the projectile does not affect
the pressure and the stresses on the target. Does this mean autodyn
only models high-velocity impacts)

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.

Dear all,

 I have a puzzling question. 

As we know, the positions of a increment in a FEM analysis ( in abaqus) include :

Dear xuanhe and all,

I have reviewed the paper "Method to analyze programmable deformation of dielectric elastomer layers". (Xuanhe zhao, Zhigang Suo)

It is very insteresting.

I have one question you would like to ask you.  Hope to get your reply.

hi plz help me in doing fatigue problem in ansys classic if u have tutorials plz send it to me its my kind request....monday is last date for me to submit..plz help me

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.

Dear All,

I am trying to simulate mechanical behaviour of a concrete unit cell for uniaxial compression laoding. I have apllied periodic bounadary conditions on both lateral edges using linear equation option available in ABAQUS where as on top and bottom edges load is apllied. Deformed structure shows there is no lateral deformation and unit cell behaves as if it is confined laterally on both sides. I am confused about my boundary conditions whether they are correct or not. 

 Equation used to aplly periodic bounadary condition are

        I am a Ph.D. student in Department of Aeronautical Structural Engineering. I expect to receive my PhD degree in July 2009 from Northwestern Polytechnical University. This university features as a top 10 engineering universities in China. My dissertation is on active/passive vibration control with piezoceramics. Part of my work has been published in an international peer-reviewed journal (“Vibration suppression of a hard disk driver actuator arm using piezoelectric shunt damping with a topology optimized PZT transducer” in Journal of Smart Materials and Structures).

i make FEA for my master research in ANSYS PRO., i simulate a prestressed concrete beam with two precast units connected by contact element (CONTA.52). i used solid 65 for concrete modelling and link 8 for for prestressing steel with initial strain, i entered the stress strain curve for the concrete with linear isotropic, concrete and multilinear isotropic in five points as below:

strain=0.0004    stress = 12 Mpa

Strain = 0.001   stress = 30 Mpa

Strain = 0.0015   stress=37.5 Mpa

strain =0.002      stress = 40 Mpa

strain = 0.0003   stress = 40 MPa

Dear, All

I am looking for a postdoctoral position.

I expect to complete my Ph.D. in Mechanical Engineering at Texas A&M University, College Station, by Dec 2009 (From Aug-2005 to Dec-2009). Defense of dissertation is scheduled in Aug-2009.

Dear all,

I have completed PhD recently(IITMadras,INDIA) and looking for postdoctoral position in the research area of vibration/damping of engineering structures which includes FGM,sandwich and composite materials. Also interested in stability and acoustic studies on thin-walled structures.

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

Hi everybody

could some one give me the Revised Johnson Cook model constants for Mild steel.

thanks in advance

Jayaram 

Hi Dears,

 I  writting an user subroutine to Add concrete with modified properties but I cann't link writed subroutine to Autodyn.

If you could help me I would be greatefull.

offcoarse your attention would be worthwhile.

Zanaboni  Theorem  Is  Not  True

I am new to Abaqus, I need assistant on modelling of pipeline.

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

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.