hi all,

I have some problems with contact elements in ANSYS.

My model is a cube of matrx containing two fibres with periodic boundary conditions. The interface between Matrix and Fibre is modeled with contact elements and cohesive zone law. 

In 2-D everything works out just fine when bringing up displacement in x-direction. Here is a movie I made of the Contact Status over the loadsteps:

http://dl.dropbox.com/u/4920002/2D_contactmovie_ContaStat_0.4.avi

Doing the same in 3D brings up some problems. The Contact status is not behaving as expected.

Dear sir
        I am Ravi dalmeya doing Phd from Indian Institute of Technology,Kanpur (India). I am doing work on adhesive elastic wavy  thin film. I have completed 2-D Hertzian contact between cylinder and elastic half space using Abaqus. Now i want to apply Dugdale-Barenblatt cohesive zone model outside the contact zone and i do not know  how to apply  Dugdale-Barenblatt cohesive zone model outside the contact zone.Can you give me some suggestion?

Thanking you

Ravi dalmeya
Phd scholar
IIT Kanpur (India)
email  rdalmeya@iitk.ac.in

Hi I am a PhD. Student at Aalborg University at Department for Mechanical and Manufacturing Engineering in Denmark. In short my PhD project treats modeling delamination damage in laminated fibrous composite structures under quasi-static and cyclic loading.

Hello, everyone!

Could you, please, help me with the following issue?

I’m trying to simulate a crack growth in an anisotropic media using cohesive zone model (CZM), and the results I get do not agree with my expectations, based on a common sense and simple estimations.

As I don’t yet feel myself on a safe ground with APDL, I make use of Ansys Mechanical, implementing command objects where needed.

Can anyone suggest some basic literature on Cohesive Zone Modeling and it's implementation through FEM? Most of the literature, I find, is on traction-separation behaviour and some simulation using a FEM package. I 'm interested to learn it's mathematical formulation and implementation through FEM. Can anyone help me?

Praveen.

Hi experts in both mechanics and abaqus,

Dear All,

I modelled a beam with a hole and used cohesive elements on the possible crack plane.

When I run the model in 2D, it works very well and I can get the results pretty good.

Why running the same model in 3D (making 3D model and running it) has caused me a headach for a long time and I can not

get the results?

Any idea highly appreciated,

Thanks,

Parisa

Hey I've got a beam and between two different materials i'm thinking to
put a cohesive zone with "weaker" material properties. Does it make
sense to use cohesive zone models?

My model is looking like this now. But I don't know what's wrong. It
seems taht the whole force/displacement is lost in the cohesive zone. 

If somebody can help that would be very nice

 here the pic: http://f.666kb.com/i/bnody4selpc6iml9m.jpg

Thanks for advance

Hello,

(for completing R. Huang's post : http://imechanica.org/node/7396).

A  few years ago, some colleages (from Italy, UK and Brazil) and I proposed some comparisons of the behavior of cohesize zone models. This was presented during ECCM 2004. The paper is attached.

Hello,

I'd like to ask if anybody knows if it is possible to use an ABAQUS usersubroutine that could vary some parameters (τmax, kn or ks etc) of the cohesive zone model of ABAQUS with the vertical pressure applied on the interface. The new ability of ABAQUS to support cohesive behaviour in contact surfaces seems very interesting and useful, however how could somebody simulate the interface under a compression - shear regime that may follow a Mohr-Coulomb type behaviour?

I tried to use the subroutine USDFLD. However I realised that it cannot be used with contact parameters as internal variables. Does anybody have any particular idea on this?

Inverse Analysis