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Muhammad waqas tofique Reply | Threaded
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Apr 24, 2010; 11:38am
Modelling of crack
1 post
Hello everyone!!
Well I am a beginner in using ABAQUS......I am using ABAQUS 6.7......i have to
model a simple 2D crack in a 2D domain......
please can any one guide me about the *simple steps to model a 2D crack.......
I have been reading all the ABAQUS manuals bt to understand them one should have a
very good prior knowledge about this topic which unfortunately i dont have.
I will be very relieved if anyone helps me out bcoz m stuck at ths point.
Regards
Waqas
[Non-text portions of this message have been removed]
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Parisa Khoshnood
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Apr 25, 2010; 3:25am
Re: Modelling of crack
57 posts
Muhammad,
go in this way:
Introduce a partition to the part you want to crack.
Go to interaction and introduce seam into your model, Also add crack to the model in
the same module.
Go to the step and use of CONTOUR INTEGRAL and ask for few contour integral.
Depending on crack length stress intensities are calculated at the crack length for you.
Use stress intensities in LEFM for predicting failure load.
Thank you,
Parisa
--- On Sat, 4/24/10, Muhammad waqas tofique <[hidden email]> wrote:
From: Muhammad waqas tofique <[hidden email]>
Subject: [Abaqus] Modelling of crack
To: [hidden email]
Date: Saturday, April 24, 2010, 4:38 PM
Hello everyone!!
Well I am a beginner in using ABAQUS...... I am using ABAQUS 6.7......i have to
model a simple 2D crack in a 2D domain......
please can any one guide me about the *simple steps to model a 2D crack.......
I have been reading all the ABAQUS manuals bt to understand them one should have a
very good prior knowledge about this topic which unfortunately i dont have.
I will be very relieved if anyone helps me out bcoz m stuck at ths point.
Regards
Waqas
[Non-text portions of this message have been removed]
[Non-text portions of this message have been removed]
Ali31
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| More
Apr 26, 2010; 12:06pm
Re: Modelling of crack
73 posts
Parisa,
Could you please tell me what field and history outputs i should request to be able to
examine the stress intensity at tip of the crack.
Another question:
I made an analysis with xfem functionality in abaqus 6.9-1 with "MAXPS" damage
evolution. An arbitrary crack initiates in middle of the elements and propagates through
the thicness but when i hover the mouse over the cracked elements, it looks like the
damaged elements are still there without damage. My question is what is the main
difference between the XEFEM and an analysis where the crack initiation is predefined
by the user. I also suspect that my analysis with xfem is not correct because the global
stresses are not falling while the crack propagates.
Have somebody tried xfem analysis in abaqus and experienced the same as i?
I appreciate any help.
Ali
--- In [hidden email], Parisa Khoshnood <parisa71@...> wrote:
>
> Muhammad,
> go in this way:
> Introduce a partition to the part you want to crack.
> Go to interaction and introduce seam into your model, Also add crack to the model in
the same module.
> Go to the step and use of CONTOUR INTEGRAL and ask for few contour integral.
> Depending on crack length stress intensities are calculated at the crack length for
you.
> Use stress intensities in LEFM for predicting failure load.
> Thank you,
> Parisa
>
> --- On Sat, 4/24/10, Muhammad waqas tofique <eskeemo_aries@...> wrote:
>
> From: Muhammad waqas tofique <eskeemo_aries@...>
> Subject: [Abaqus] Modelling of crack
> To: [hidden email]
> Date: Saturday, April 24, 2010, 4:38 PM
>
>
>
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>
>
> Â
>
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>
>
>
>
> Hello everyone!!
>
> Â
>
> Well I am a beginner in using ABAQUS...... I am using ABAQUS 6.7......i have to
model a simple 2D crack in a 2D domain......
>
> Â
>
> please can any one guide me about the *simple steps to model a 2D crack.......
>
> Â
>
> I have been reading all the ABAQUS manuals bt to understand them one should have
a very good prior knowledge about this topic which unfortunately i dont have.
>
> I will be very relieved if anyone helps me out bcoz m stuck at ths point.
>
> Â
>
> Regards
>
> Waqas
>
>
>
> [Non-text portions of this message have been removed]
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... [show rest of quote]
tobadooor-2
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| More
Apr 26, 2010; 4:10pm
RE: Re: Modelling of crack
5 posts
Hi Muhammad,
I just get back from Abaqus workshop for modeling Fracture and Failure with Abaqus.
For the background you need the following:
1-Fracture mechanics book for Anderson. It has lots of examples.
2-If you can by the handout for the workshop you will have a complete examples on
how to do crack analysis and crack probagation. it available on Simulia.com of you
want to buy it.
Now if you want to do crack analysis you have to decide first
1- What is your material behavior? ( Brittel or Ductile)
2- Do you want LEFM or EPFM? (thats linear elastic fracture mechanics and elasto-
plastic fracture mechanics).
3- Do you want to do stationary crack or crack propagation?
your history out put you asked for depend on your answers for the above questions.
Anyway, for LEFM you can use the seam but for EPFM you have to do a blunt crack
(no seam).
if your problem is stationary then you can request stress intensity then from the output
chose K1 and which contour you want , chose the 3rd,4th, and 5th contours and
average them(your step should be nonlinear). If you want nonlinear then you can
request J-Integral but not K since the difference is big for nonlinear problems.
For crack propagation: you can use cohesive, VCCT or XFEM.
alot of explanation on the hand outs. The best is XFEM but you need to many material
properties to do that. This is because you need to specify damage initiation criteria and
then damage evolution ( this is needed for cohesive and VCCT as will).
you should start with LEFM problem from the book i mentioned and do a linear
problem first. I hope this will help.
Regards,
Badr Bedairi
To: [hidden email]
From: [hidden email]
Date: Mon, 26 Apr 2010 17:06:10 +0000
Subject: [Abaqus] Re: Modelling of crack
Parisa,
Could you please tell me what field and history outputs i should request to be able to
examine the stress intensity at tip of the crack.
Another question:
I made an analysis with xfem functionality in abaqus 6.9-1 with "MAXPS" damage
evolution. An arbitrary crack initiates in middle of the elements and propagates through
the thicness but when i hover the mouse over the cracked elements, it looks like the
damaged elements are still there without damage. My question is what is the main
difference between the XEFEM and an analysis where the crack initiation is predefined
by the user. I also suspect that my analysis with xfem is not correct because the global
stresses are not falling while the crack propagates.
Have somebody tried xfem analysis in abaqus and experienced the same as i?
I appreciate any help.
Ali
--- In [hidden email], Parisa Khoshnood <parisa71@...> wrote:
>
> Muhammad,
> go in this way:
> Introduce a partition to the part you want to crack.
> Go to interaction and introduce seam into your model, Also add crack to the model in
the same module.
> Go to the step and use of CONTOUR INTEGRAL and ask for few contour integral.
> Depending on crack length stress intensities are calculated at the crack length for
you.
> Use stress intensities in LEFM for predicting failure load.
> Thank you,
> Parisa
>
> --- On Sat, 4/24/10, Muhammad waqas tofique <eskeemo_aries@...> wrote:
>
> From: Muhammad waqas tofique <eskeemo_aries@...>
> Subject: [Abaqus] Modelling of crack
> To: [hidden email]
> Date: Saturday, April 24, 2010, 4:38 PM
>
>
>
>
>
>
>
> Â
>
>
>
>
>
>
>
>
>
> Hello everyone!!
>
> Â
>
> Well I am a beginner in using ABAQUS...... I am using ABAQUS 6.7......i have to
model a simple 2D crack in a 2D domain......
>
> Â
>
> please can any one guide me about the *simple steps to model a 2D crack.......
>
> Â
>
> I have been reading all the ABAQUS manuals bt to understand them one should have
a very good prior knowledge about this topic which unfortunately i dont have.
>
> I will be very relieved if anyone helps me out bcoz m stuck at ths point.
>
> Â
>
> Regards
>
> Waqas
>
>
>
> [Non-text portions of this message have been removed]
>
>
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>
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> [Non-text portions of this message have been removed]
>
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Panagiotis-4
Reply | Threaded
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Dec 15, 2010; 12:38pm
Re: Modelling of crack
34 posts
Hi Ali,
if you are using XFEM there is a good website with basic examples:
http://sites.google.com/site/matthewjpais/abaqus
I hope it helps,
Panos
--- In [hidden email], bador hamz <tobador@...> wrote:
>
>
> Hi Muhammad,
>
> I just get back from Abaqus workshop for modeling Fracture and Failure with
Abaqus.
>
> For the background you need the following:
>
> 1-Fracture mechanics book for Anderson. It has lots of examples.
> 2-If you can by the handout for the workshop you will have a complete examples on
how to do crack analysis and crack probagation. it available on Simulia.com of you
want to buy it.
>
> Now if you want to do crack analysis you have to decide first
>
> 1- What is your material behavior? ( Brittel or Ductile)
> 2- Do you want LEFM or EPFM? (thats linear elastic fracture mechanics and elasto-
plastic fracture mechanics).
> 3- Do you want to do stationary crack or crack propagation?
>
>
> your history out put you asked for depend on your answers for the above questions.
>
> Anyway, for LEFM you can use the seam but for EPFM you have to do a blunt crack
(no seam).
>
> if your problem is stationary then you can request stress intensity then from the
output chose K1 and which contour you want , chose the 3rd,4th, and 5th contours and
average them(your step should be nonlinear). If you want nonlinear then you can
request J-Integral but not K since the difference is big for nonlinear problems.
>
> For crack propagation: you can use cohesive, VCCT or XFEM.
>
> alot of explanation on the hand outs. The best is XFEM but you need to many
material properties to do that. This is because you need to specify damage initiation
criteria and then damage evolution ( this is needed for cohesive and VCCT as will).
>
> you should start with LEFM problem from the book i mentioned and do a linear
problem first. I hope this will help.
>
> Regards,
>
> Badr Bedairi
>
>
>
>
>
>
>
> To: [hidden email]
> From: akhaje@...
> Date: Mon, 26 Apr 2010 17:06:10 +0000
> Subject: [Abaqus] Re: Modelling of crack
>
> Parisa,
>
>
>
> Could you please tell me what field and history outputs i should request to be able to
examine the stress intensity at tip of the crack.
>
> Another question:
>
> I made an analysis with xfem functionality in abaqus 6.9-1 with "MAXPS" damage
evolution. An arbitrary crack initiates in middle of the elements and propagates through
the thicness but when i hover the mouse over the cracked elements, it looks like the
damaged elements are still there without damage. My question is what is the main
difference between the XEFEM and an analysis where the crack initiation is predefined
by the user. I also suspect that my analysis with xfem is not correct because the global
stresses are not falling while the crack propagates.
>
> Have somebody tried xfem analysis in abaqus and experienced the same as i?
>
> I appreciate any help.
>
>
>
> Ali
>
>
>
> --- In [hidden email], Parisa Khoshnood <parisa71@> wrote:
>
> >
>
> > Muhammad,
>
> > go in this way:
>
> > Introduce a partition to the part you want to crack.
>
> > Go to interaction and introduce seam into your model, Also add crack to the model
in the same module.
>
> > Go to the step and use of CONTOUR INTEGRAL and ask for few contour
integral.
>
> > Depending on crack length stress intensities are calculated at the crack length for
you.
>
> > Use stress intensities in LEFM for predicting failure load.
>
> > Thank you,
>
> > Parisa
>
> >
>
> > --- On Sat, 4/24/10, Muhammad waqas tofique <eskeemo_aries@> wrote:
>
> >
>
> > From: Muhammad waqas tofique <eskeemo_aries@>
>
> > Subject: [Abaqus] Modelling of crack
>
> > To: [hidden email]
>
> > Date: Saturday, April 24, 2010, 4:38 PM
>
>>
> > Hello everyone!!
>
> >
>>
> > Well I am a beginner in using ABAQUS...... I am using ABAQUS 6.7......i have to
model a simple 2D crack in a 2D domain......
>
> >
>
> > please can any one guide me about the *simple steps to model a 2D crack.......
>
> >
>
> > Â
>
> >
>
> > I have been reading all the ABAQUS manuals bt to understand them one should
have a very good prior knowledge about this topic which unfortunately i dont have.
>
> >
>
> > I will be very relieved if anyone helps me out bcoz m stuck at ths point.
>
> >
>
> > Â
>
> >
>
> > Regards
>
> >
>
> > Waqas
>
... [show rest of quote]
Ranil Banneyake
Reply | Threaded
| More
Dec 15, 2010; 1:03pm
Re: Re: Modelling of crack
95 posts
In reply to this post by Ali31
In XFEM the element will not disappear but will deform as if there is a
crack. To visualize the crack you have to use the varialbe STUTUSXFEM
Also look at the PHILSM for the crack surface.
Ranil
On Mon, Apr 26, 2010 at 12:06 PM, denzel_washington25
<[hidden email]>wrote:
>
>
> Parisa,
>
> Could you please tell me what field and history outputs i should request to
> be able to examine the stress intensity at tip of the crack.
> Another question:
> I made an analysis with xfem functionality in abaqus 6.9-1 with "MAXPS"
> damage evolution. An arbitrary crack initiates in middle of the elements and
> propagates through the thicness but when i hover the mouse over the cracked
> elements, it looks like the damaged elements are still there without damage.
> My question is what is the main difference between the XEFEM and an analysis
> where the crack initiation is predefined by the user. I also suspect that my
> analysis with xfem is not correct because the global stresses are not
> falling while the crack propagates.
> Have somebody tried xfem analysis in abaqus and experienced the same as i?
> I appreciate any help.
>
> Ali
>
>
> --- In [hidden email] <Abaqus%40yahoogroups.com>, Parisa Khoshnood
> <parisa71@...> wrote:
> >
> > Muhammad,
> > go in this way:
> > Introduce a partition to the part you want to crack.
> > Go to interaction and introduce seam into your model, Also add crack to
> the model in the same module.
> > Go to the step and use of CONTOUR INTEGRAL and ask for few contour
> integral.
> > Depending on crack length stress intensities are calculated at the crack
> length for you.
> > Use stress intensities in LEFM for predicting failure load.
> > Thank you,
> > Parisa
> >
> > --- On Sat, 4/24/10, Muhammad waqas tofique <eskeemo_aries@...> wrote:
> >
> > From: Muhammad waqas tofique <eskeemo_aries@...>
>
> > Subject: [Abaqus] Modelling of crack
> > To: [hidden email] <Abaqus%40yahoogroups.com>
> > Date: Saturday, April 24, 2010, 4:38 PM
> >
> >
> >
> >
> >
> >
> >
> > Â
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Hello everyone!!
> >
> > Â
>
> >
> > Well I am a beginner in using ABAQUS...... I am using ABAQUS 6.7......i
> have to model a simple 2D crack in a 2D domain......
> >
> > Â
>
> >
> > please can any one guide me about the *simple steps to model a 2D
> crack.......
> >
> > Â
>
> >
> > I have been reading all the ABAQUS manuals bt to understand them one
> should have a very good prior knowledge about this topic which unfortunately
> i dont have.
> >
> > I will be very relieved if anyone helps me out bcoz m stuck at ths point.
> >
> > Â
>
> >
> > Regards
> >
> > Waqas
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
... [show rest of quote]
[Non-text portions of this message have been removed]
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cheikhemse
Reply | Threaded
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Jul 25, 2011; 5:15am
Re: Modelling of crack
2 posts
This post was updated on Jul 25, 2011; 8:18am .
In reply to this post by Panagiotis-4
Hello dears,
I am a new abaqus user and i am trying to model a crack propagation in 3D. I have seen
the tutorial of Matthiew but it doesn't work! the crack does not propagate.
I need a help. Do somebody have a tutorial which works nicely. I am using 6.9 version
Thank you in advance
Cheikh
cheikhemse
Reply | Threaded
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Jul 27, 2011; 3:01am
Re: Re: Modelling of crack
2 posts
In reply to this post by Ranil Banneyake
Hello dears,
I am a new abaqus user and i am trying to model a crack propagation in 3D. I have seen
the tutorial of Matthiew but it doesn't work! the crack does not propagate.
I need a help. Do somebody have a tutorial which works nicely. I am using 6.9 version
Thank you in advance
Cheikh
sangsazeh
Reply | Threaded
| More
Jun 09, 2013; 5:07pm
Re: Modelling of crack
3 posts
This post has NOT been accepted by the mailing list yet.
In reply to this post by Muhammad waqas tofique
xfem.cae
M Abdullah
Reply | Threaded | More
Jun 19, 2013; 10:04am
Re: Modelling of crack
6 posts
This post has NOT been accepted by the mailing list yet.
In reply to this post by Parisa Khoshnood
Hi Muhammad
I am trying to model a 2D edge crack using FEM but I do not understand the
instructions.
The following are stated:
Partitioned
Select the crack front (first contour region);
Select the crack tip region;
Specify crack extensiondirection using Normal to crack plane;
Select start point;
Select end point.
there are then 3 green crosses
I then created a part using 2D wire next to where the green crosses start.
Job completed but no higher stresses at the crack area.
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