User login

bugatti87's picture

Calculation of Power law frequency dependence in ABAQUS

Hi everyone:
Now i am doing a dynamic analysis of a sandwich structure in ABAQUS
,which is consist of viscoelastic (ER) material and elastic ones. I want to
input viscoelastic material parameters by means of Frequency=formula.But
I have only formula of shear modulus(including storage modulus and
loss modulus expressed in frequency domain) about the material
,Real(G)=G',Loss
factor=G'',(G=G'+iG'').So how can i
get the paraments required by Frequency=Formula? Thank you and waiting
for your answer!

KennyNg's picture

Transverse moduli for composite

I'm currently working on modeling 3 phases composites material. However, I'm having hard time on finding the transverse modulus as it's different from analytical results. I've been using Mori-Tanaka approach to determine the stiffness moduli. Does anyone know how to obtain a correct values for the transverse moduli? 

Modelling 2D instead of 3D in ABAQUS

Hi,

I modeled a beam with a hole in ABAQUS in 2D and now I would like to stick one plate to the beam surface.

I can do it easily in 3D but actually I do not like to jump 3D because It will make analyses very hard to follow.

My question is that, Is there anyway to stick a the plate to beam in 2D in ABAQUS and avoid 3D?

Thank you,

Parisa

FRICTION STIR WELDING -SIMULATION-ABAQUS

Could you tell me how to define inflow and outflow eulerian boundary in ALE? MY ERROR IS "An Eulerian boundary region cannot overlap a sliding boundary region"

Defined in the first interface surface, and then modify the inp file, change to add
REGION TYPE = EULERIAN

*SURFACE, NAME=SURF1, REGION TYPE=SLIDING
TOP,S4

*SURFACE, NAME=EULER1, REGION TYPE=EULERIAN
EULER1,S3

Then, I go on the File/Import/Model...inp.file  - when he fined warning

Use of Hashin damage criteria for plain woven composites in ABAQUS.

Hi,

I am trying to model impact damage in a composite plate made of woven plies lay-up. I have 2 questions probably basics but I can't find any clear answer and I hope someone could help me.

1) Can the Hashin damage criterion in ABAQUS be applied to a plain woven composites? I know that initially Hashin critrion was for unidirectional composites and looking at the equations I can't see how this criterion could make the difference between matrix and fibre failure in the case of woven composites, but I can't find any restriction in ABAQUS documentation.

grassl's picture

Two PhD studentships in computational fracture mechanics at the University of Glasgow

There are two PhD studentships available at the University of Glasgow in the area of computational fracture mechanics of concrete.

The topics are multiscale modelling of corrosion induced cracking and meso-mechanically motivated nonlocal models for fracture

Please visit my webpage at http://www.civil.gla.ac.uk/~grassl for more information.

All the best,

Peter Grassl

abaqus, cel, coupled eulerian lagrangian, fluid flow

I am trying to model a tube which is filled with liquid that is being crushed.  I am using Coupled Eulerian Lagrangian to model the problem in abaqus, and there are a few distortions/errors in the model.  I am using symmetry to model only quarter of the model.  The liquid actually comes out from the sides of the tubes as the two attached pictures show.  

 

Zoom in from the side.  It shows the eulerian elements coming out of the tube

Tang Lihua's picture

Research Fellow Position Available @ NTU: Concrete Material Modeling

Concrete Material Modelling under High Strain Rate

Post available: Research Fellow

Duration of appointment:2 years

 

Brief description of the research project

J Mahmud's picture

ICAME 2010: 3rd International Conference on Advances in Mechanical Engineering

   ICAME 2010: 2nd Call for Papers, due 15 Sept 2010 

         2 - 5 December 2010

         Shah Alam, MALAYSIA

         visit: www.icame2010.org

 

PROGRESSIVE DAMAGE AND FAILURE ABAQUS / EPOXY RESINS

Hi everybody,

 have you ever tried to model the damage behaviour of a material using the theory of progressive damage and failure

for ductile metals implemeted in Abaqus for continuum elements?

If so, do you think it is possible to use the same theory to model the damage behaviour of an epoxy resin?

Are there any articles in which this has been done? Could you please suggest me some articles to read?

 Thank you very much.

Regards,

 Cecilia 

How to apply pressure on perticular side of the shell element

If a pressure is to be applied on one of the sides of the shell element (not on the mid surface) in ansys, how to do it? And if the pressure ie acting on both the sides of the geometry, then how to take care of it when shell element is being used?

Arash_Yavari's picture

Joint Postdoctoral Fellow Position at KAUST and Georgia Institute of Technology

                                     
Joint Postdoctoral Fellow Position at KAUST and Georgia Institute of Technology — Accepting applications until the position is filled

We have one more opening and have no U.S. visa waiver requirement anymore.

bugatti87's picture

abaqus

how can i define frequency domain viscoelastic material & electrorheological in abaqus ?

surajmravindran's picture

Bimaterial interface modelling using ABAQUS

Hii all,

How can we model a bi-material interface using abaqus. 

Aircraft Wing Dynamics

Choose a channel featured in the header of iMechanica: 

Hello,

I am looking for any resource where I can get some data regarding the average force and its time variation with which the wind applies force onto an aircraft body especially the wing. To reframe the question in a better way: can anyone recommend a resource that has data about the wind velocity profile around the aircraft (especially the wings) or pressure/shear force profile on the boundary of the aircraft (especially the wings) during various phases in its flight. 

If periodic boundary conditions do not respect stress continuity at the boundary....

Hi everybody,

have you ever tried to implement in Abaqus periodic boundary conditions?

I am doing this. Particularly, I am applying PBC to unit cells constituted of a clay particle in an epoxy matrix.

When I apply PBC in case of transverse shear, I have convergence problems using Abaqus standard,

so I have to use an algorithm of stabilization but because of this one

I have to renounce to the stress continuity between opposite boundaries of the unit cell.

Do you think this is normal or I am doing some mistakes?

How are Compression Modulus and Tensile Modulus related to Lame` constants?

Choose a channel featured in the header of iMechanica: 

Hello everyone

I have a material with a compression modulus and tensile modulus along with Poisson's ratio. Are compression modulus and tensile modulus related to the Lame` constants? Or does this material fall under 'cubic symmetry' which needs three elastic constants? In that case, how are they related to the elastic coefficients (C12, C44 or C11)?

I need to incorporate these material properties in ABAQUS. How do I model this material in ABAQUS?

Any lead on this problem is appreciated. Thanks a lot.

--

Nikhil

Can I retrive strain increment in ABAQUS with python?

Choose a channel featured in the header of iMechanica: 

Dear all,

I just finished extrusion process simulation in ABAQUS with the input of stress-strain data. Now I want to retrive the strain increment of certain element during each deformation increment. Surely one can write straininc to a *.txt file when simulating with VUMAT. But the simulation of extrusion will be extremely slow with VUMAT. So How can I get the strain increment when simulating with the input of stress-strain data? 

Best regards,

PhD candidate position is available in microstructure/damage interactions in advanced superalloys at elevated temperatures

One PhD candidate position is available in the Department of Mechanical engineering at the University of Rhode Island. This fully supported position which is to be filled by January 2011, is for thesis research focusing on microstructure/damage interactions in advanced superalloys at elevated temperatures.

Pages

Subscribe to iMechanica RSS Subscribe to iMechanica - All comments

More comments

Syndicate

Subscribe to Syndicate