iMechanica - Fracture in Abaqus - Comments

Properties of cohesive zone models and their parameters

marco.paggi — Sat, 04 Feb 2012 15:24:16 -0500

Dear All,

in this recent article you may find how to select the properties of the cohesive zone model (stiffness, and so on) according to physical arguments:

M. Paggi, P. Wriggers: "Stiffness
and strength of hierarchical polycrystalline
materials with imperfect interfaces", Journal of the Mechanics and
Physics of Solids, in press, doi:10.1016/j.jmps.2012.01.009

This has been possible by proposing a new CZM for finite thickness interfaces:

M. Paggi, P. Wriggers: "A nonlocal
cohesive zone model for finite thickness interfaces – Part I:
mathematical formulation and validation with molecular dynamics", Computational Materials Science, Vol. 50 (5), 1625-1633, 2011.doi:10.1016/j.commatsci.2010.12.024

Here you may find its implementation in the finite element code FEAP:

M. Paggi, P. Wriggers: "A nonlocal
cohesive zone model for finite thickness interfaces – Part II: FE
implementation and application to polycrystalline materials", Computational
Materials Science, Vol. 50 (5), 1634-1643, 2011. doi:10.1016/j.commatsci.2010.12.021

Best regards,

Marco Paggi

Hi everybody I have created

Reza Hojjati — Mon, 16 Jan 2012 11:21:00 -0500

Hi everybody

I have created ABAQUS *inp file and I am going to open this file in ANSYS in order to use the model for crack initiation analyze.

Is it possible or not. if no is any prepared code available to translate it for ANSYS?

How to extract force on surface in Abaqus

Sai_prasanna — Fri, 06 Jan 2012 03:31:50 -0500

Hello every one,

Please some one tell me how I can get the extract force on the weld joints in abaqus cae(static Analysis)!

How to Extract force on surface ...What option in Abaqus cae

Thanks,

Prasanna

Please could you tell me

PeterBrusss — Thu, 05 Jan 2012 02:47:42 -0500

Please could you tell me how I can get the SIF at the crack tip in abaqus cae! I am modeling a static 2D case where the crack is horizontal, I want to see the accuracy of SIF as the mesh becomes finer?

Thanks!
Peter @coupon codes

request helping

mohamadreza — Fri, 18 Nov 2011 02:18:42 -0500

Hi Zhenyu Xue

I want to simulation of fatigue crack propagation in abaqus, But lost my abaqus manual.if you can help me by explaining which steps I have to do for simulate, I am really thankthful.

I usually late check this web page.

mohamadreza86@gmail.com , Is my e-mail and I check it every day!

Help for Dugdale-Barenblatt cohesive zone model

rdalmeya — Tue, 27 Sep 2011 06:18:30 -0400

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

cohsive elements for facture siumlations initiated by indentor

ABAqirl — Sat, 30 Apr 2011 03:07:13 -0400

Dear Prof. Gao,

I deals with cck propagationsimulations initiated from indenter. Ialready created the model for indentation in ABAUS Explit, it worls well, bt i haveno idea how to plement the cohesive elements in it. The best way i think to introduce tese elements via ABAUS CAE. Could you please give me some hints whee can i find the tutoials fr cohesive elements.

Best regards

ABAgirl

Multiple Cracks modeling in Ansys

laxmi512 — Sat, 12 Feb 2011 12:45:38 -0500

Hi...

I am working on two cracks emanating from each circular hole.

In ansys we can only model one crack at a time.

So can anyone pls suggest how to model a plate containing multiple cracks.

Thanks,

Laxmi

SIF in Abaqus 2D

reza0388 — Wed, 09 Feb 2011 01:51:44 -0500

Hello every one,

Please some one tell me how I can get the SIF at the crack tip in abaqus cae! I am modeling a static 2D case where the crack is horizontal, I want to see the accuracy of SIF as the mesh becomes finer.

Thanks,

Reza

Cohesive zone

gammoudy — Tue, 05 Oct 2010 10:26:19 -0400

Hi,

I'm new in this forum. Iwould ask Mr Gao in order to explain some things. So, I'm working on cemented fixation of orthopaedic implant. My model was consists of three parts: implant, acrylic cement and bone. Thus i'm having two interfaces, the one between implant-cement and another betwenn cement-bone. I would to simulate the pull out test of the implant. What the nature of intéraction in the different two interfaces. How simulate my problem without any subroutine. WHAT do I do if I WOULD predict the damage and the failure of the interphase.

thanks for answer me

and I'm very sorry for my Bad english

damage evolution

aydin- kabir — Wed, 08 Sep 2010 02:06:46 -0400

hi every body

i simulated a rigid projectile and deformble target, i used Weldox 460 E Steel for target and use "Johnson-cook" model for damage, but i cannot define 'Damage evolution" ! i mean whwn i going to use "Displacement" for damage evolution i cannot find a good value for "Charactersic Length" ! element size for target is 0.2*0.2*0.2mm^3,

can any body help me?

best regards

3D edge crack modeling with J-integral method in

payam — Mon, 16 Aug 2010 13:19:36 -0400

Hi every one,

i am new in this field.

would you please introduce me any step by step modeling of 3D edge crack modeling with J-integral method ?

i can model it in 2D, but have problems in 3D

regards,

Zhenyu: If a

Bo Yang — Wed, 03 Mar 2010 13:51:33 -0500

Zhenyu:

If a singularity-based approach can handle it, the CZ model can do it too. In place of K-based criteria, damage induction criteria (similar to yield criteria of plasticity) can be devised based on stresses at the fictitious crack tip to simulate arbitrary crack growth within the CZ model.

The "blast" case you mentioned I would not consider right now a conventiional frature problem we would typically think of dealing with individual cracks, because there are just too many cracks in a blast. The cohesive element model plus some complicated consitutive law applied to the volume seems to me the best approach for the time being. Maybe one day the computer technology has advanced so much, we could simulate all those indivual cracks as indivisuals.

Wow, ABAQUS should pay you all

Bo Yang — Wed, 03 Mar 2010 12:00:15 -0500

for the research.

Before all the numerical algorithms, do we understand the nature of dynamic fracture, or say, have we discovered any reliable criterion for dynamic crack propagation?

The quasistatic crack propagation has become friendly though, at least, in homogeneous materials.

It seems a lot of us have stopped writing a code of our own. Is this so in order to graduate sooner?...

David, your reply

arasuk — Wed, 03 Mar 2010 06:01:03 -0500

David,

your reply awakening to do more for my research on crack simuation. Could you please indicate how to determine stress intensity factoers (Ki,KII and KII) using ABAQUS? I highly appreciate for your time.

-arasu

Fracture in Abaqus

Michael Borowicz — Tue, 27 Mar 2007 05:57:20 -0400

Good morning

I'm working in Abaqus on modelling crack propagation. Regards this i have two questions.

1)I would like to ask if it is possible for Abaqus to create automatic propagation in 2D. What should I do to receive the effect. I've defined the crack and in the history Output i've defined the crack initiation criterion. There are no warnings, no errors, and in visualization module the effects are miserable.

2)When I'm trying to plot Crack prop. direction I'm receiving only points in vertical for time=1s, and I would like to receive crack propagation for different state of times, different moments.

P.s. Sorry for my english, I hope everything is clear enough to understand this post. I hope someone can help me.

Regards

Michael Borowicz