iMechanica - Fracture in Abaqus - Comments

Modelling Elliptical Surface Crack(Quarter Plate model)

SIVAKUMAR M V N — Tue, 27 May 2008 16:12:19 -0400

Hope you are having rich experience with ABAQUS. Can you please help me in " Modelling a Surface Elliptical Crack ( Quarter Plate)". If you have any kind of notes on the same please forward it. Otherwise atleast tell some source from where I can get the help in this regard.

Thanking you

MVN

Modeling of Crack in thru-hole of a plate/Lamb wave propagation

Jo Ukpai — Mon, 12 May 2008 12:44:29 -0400

Hi All,

I'm presently working on modelling of guided ultrasonic wave scattering at defect using Abaqus/CAE. Can anyone help me with some tutorial materials on modelling of crack or notch in a through-hole of a plate as well as loading the model with Lamb Wave?

Warm Rgrds.

Jo Ukpai

JIU

let's see the plastic zone arround the tip

Xiaobo Ren — Fri, 09 May 2008 12:00:40 -0400

Hi,

To your question 1):

You can define the field output PEEQ (Equivalent plastic strian at integration points) , then you can check the plastic zone afterwards.

Xiaobo

Elliptical Surface crack Modeling

SIVAKUMAR M V N — Fri, 09 May 2008 10:40:39 -0400

Dear All,

can anybody help me to Model an Elliptical surface crack.Please give me an instruction manual kind of thing . Otherwise mention where to start whether in ABAQUS/CAE or in ABAQUS/Explicit.

Thanks in advance. please respond.........

Regards,

MVN

crack propagation

Gouse — Tue, 05 Feb 2008 11:25:38 -0500

hello

I read the above intersting discussion. I have a doubt, whether I can give my own fracture criterion in ABAQUS. I am trying to simulate crack propagation using ANSYS right now I am using Max normal stress criterion now I want change fracture criteron. I want to include fracture toughness along with max normal stress can I able to implement in ANSYS or is there any provision in ABAQUA

Regards

Gouse

element and node splitting

H.Ghadbeigi — Sun, 27 Jan 2008 07:12:56 -0500

hi guys,

i am going to simulate material failure by using Johnson-cook pasticity and damage model, but i need to split my elements when the material fail, so i have some questions:

1- how can i split element ( or nodes) in my model to show the effect of material separation

2- is it going to work with ALE formulation implemented in Abaqus?

i did some simulations but when it starts for plasticity calculation it exit with ERROR CODE 5 or 114? do you know whats that?

Regards

Hassan

Sheffield

plastic zones arround the crack tip

Violeta Lopez — Thu, 17 Jan 2008 18:41:30 -0500

Hi everyone,

I have a lot of doubts:

1) i wonder if it is posible to find the plastic zones trough abaqus arround the crack tipi.

2) What do i need exactly to define a crack in a viscoelastic step?

3) When i ask the hystory output for the J-integral how can i interpretate the graphics and how can i know if its working because in the model, in visualization nothing is happening is almost the same figure that in the asembly.

Iknow is alot but is really important, so thank you in advance for helping me.

Violeta

Metal Foam Failure critrion

mhmd abdelshafy — Thu, 10 Jan 2008 08:09:05 -0500

Dear All

I'm working on studing the use of metal foam in sandwich structre containing Al or steel plate to overcome an impact shells or plates at differnet impact velocity but the prblem that I face how to define the failure critrion of Meat foam except difine the crushable foam properties, and I've read a paper on using cohesive element but i don'nt know how to use it.

Hopefully some one can help me solving this prblem, by the way I'm using ABAQUS v6.6

Regards

Re: Interface modelling in ABAQUS

Amir Siddiq — Sat, 08 Dec 2007 07:06:32 -0500

Hi Sathish,

You might know already about them but as starting point, basic ingredients of the cracking behaviour would be:

- construction of an optimized finite element model with proper assumptions of loading, boundary, symmetry, etc conditions and size, type of elements,...

- selection of approperiate material model for the material, and identify or obtain the corresponding material parameters (most likely from experiments or literature search).

- There are different material models already available in ABAQUS based on concrete cracking, damage plasticity, etc. Please, have a look in the documentation and see if you find anyone of them useful. Although, I am not sure if they are based on thermal loading or not. Otherwise there is always a possibility to write a user material subroutine.

- In most of the cases you must know the crack path apriori to perform crack propagation analyses in ABAQUS. Do you already know?

- Another tedious way would be to find the potential direction of crack propagation and separate nodes in that direction but it is a tedious job to do. You might need many steps/increments etc.

- There are many criterion present, based on your explaination a criterion based on shear stresses might serve the purpose but not sure until further details of the experimental results are known.

I hope this helps. Please let me know if you require further clarifications.

All the best. ENJOY THE BUMPY RIDE.:) and never lose hope.

Amir

Interface modelling to predict delamination pattern.

Sathish Konduru — Fri, 07 Dec 2007 14:37:36 -0500

Hi Amir,

I am
doing the similar project like what you did. My project is to predict
the delamination pattern in the interface of a bi-layer system
(substrate and overlay) using ABAQUS. Substrate is made of normal
concrete and overlay is made of High-Performance concrete. Delamination
is induced by maintaining high temperature (say 95 F) in the enclosed
room due to which different materials used will absorb different
temperatures and because of this difference of temperature in two
layers, shear stresses are developed at the interface due to which the
delamination occurs.

My questions are: What are the properties required to input in ABAQUS?

How to model the interface?

How to input the temperature loads?

Any suggestions will be appreciated. Thank you very much Sir.

Sathish konduru.

West Virginia university

hi David

prashant sharma — Sat, 29 Sep 2007 13:47:38 -0400

thanks for the link , but i was wondering, that we can use only up 40 element or some thing , with this limitation i am not able complete my project , as my model will be having some 1 Lakhs element.

so could u tell me how can i can solve my problem.

thanks & regards

Zencrack for evaluation

David Houcque — Thu, 27 Sep 2007 22:35:38 -0400

Hello Prashant:

For details, you can use this link:

http://www.zentech.co.uk/zencrack_download_evaluation.htm

Cheers.

crack propagation using Zencrack with abaqus

prashant sharma — Thu, 27 Sep 2007 13:32:41 -0400

any one have idea about how to use zencrack for cracking ,, how i get this software ( free download link) , please let me know

i have to simulate the crack progation in annular disk for my project work

tnks

Open source code for Embedded Strong Discontinuity (EFEM)

Nguyen An — Wed, 01 Aug 2007 15:39:36 -0400

Hi all,

I am now learning strain localization in solids and geometerial by using Embedded Strong Discontinuity theory (EFEM or elemental enrichment). I am looking for an open source code to learn how to understand and how to reproduce some examples by using EFEM. Did anyone know that?

Any advice will be appreciated.

Cheers.

Simulation Residual stress With ABAQUS

majid — Tue, 17 Jul 2007 07:10:10 -0400

Iwant to simulate residual stress in inner portion of a pipe in ABAQUS Please HELP ME!!!

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