Nabble - Abaqus Users

Anyone has a sample input file of delamination in Composite....

2008-11-22T04:52:45Z

Anyone has a sample input file of delamination in Composites. I need it for modelling it. Cant understand things from Users manual. Please help.
My email id: hubble_eyes@yahoo.com
Many thanks

Re: put load and BC's at node?

2008-11-21T15:43:49Z

best approach: partition the geometry so that you have a vertex at the
point where you want the BC.
in a pinch: put your BC directly in the .inp file.

Re: Multiple steps

2008-11-21T12:05:02Z

Hello,

I guessing that you have model in Abaqus/Standart. Standart does not
"freeze" displacements from previously step to new step.
If you want to do this you have to use optional argument "fixed" in boundary
keyword.
You can also define zero value velocity or acceleration at specifed nodes to
keep displacement.

I does not use CAE so I can only give you example how to modified inputdeck:

** Step first with tension
*STEP
...
*BOUNDARY
left_nodes_set, encastre
*CLOAD
right_nodes_set, 1, 10
...
*END STEP
** step two with perpendicular force
*STEP
...
*BOUNDARY, OP=NEW, FIXED
left_nodes_set, encastre
right_nodes_set, encastre
*CLOAD, OP=NEW
middle_nodes_set, 2, 10
...
*END STEP

Comment: 1 - tension direction, 2 - perpendicular direction, in both cases
force is equal 10.

For more information about bounduary conditions please take a look to abaqus
documentation
- Abaqus Analysis User's Manual 28.3.1 Boundary conditions
- Abaqus Keywords Reference Manual *BOUNDARY keyword

Regards
Bartosz

----- Original Message -----
From: "MariaZog" <mzoghaib@...>
To: <ABAQUS@...>
Sent: Friday, November 21, 2008 3:40 PM
Subject: [ABAQUS] Multiple steps

>
> Hello,
> I'm using abaqus CAE. My model is a thin plate.
> It is submitted in the first step to a body force in the horizontal
> direction (direction 1) with only one end encastre . And in the second
> step
> it is submitted to a force in the middle that is perpendicular to it
> (direction3) while both plate ends are encastre.
> I want the displacement of a point in the center of the plate in the 3rd
> direction after both those steps.
> The problem is that the tension due to the first step is not taken into
> account in the second step.
> This means the displacement is the same if i run the simulation without
> the
> first step.
> Why? and how to remedy?
> Thanks in advance
> --
> View this message in context:
> http://www.nabble.com/Multiple-steps-tp20622402p20622402.html
> Sent from the Abaqus Users mailing list archive at Nabble.com.
>
>

Beam Vibriating within a Fluid - drag?

2008-11-21T08:05:56Z

I"m trying to model a beam vibrating transversely within a fluid. Besides the *BEAM FLUID INERTIA effects and some alpha damping in the material, anybody got any ideas on how to model the drag on the motion from the fluid? (without having to do a coupled CFD problem and without using fluid elements). I don't want to add too much complexity to this model.

Any thoughts?

Thanks.
Steve

[Non-text portions of this message have been removed]

Multiple steps

2008-11-21T06:40:15Z

Hello,
I'm using abaqus CAE. My model is a thin plate.
It is submitted in the first step to a body force in the horizontal direction (direction 1) with only one end encastre . And in the second step it is submitted to a force in the middle that is perpendicular to it (direction3) while both plate ends are encastre.
I want the displacement of a point in the center of the plate in the 3rd direction after both those steps.
The problem is that the tension due to the first step is not taken into account in the second step.
This means the displacement is the same if i run the simulation without the first step.
Why? and how to remedy?
Thanks in advance

Can I use Abaqus to simulate a moving object? (urgent)

2008-11-21T02:36:21Z

Hi all;

Can I use Abaqus to simulate a moving object?

what is the suitable vetsion of Abaqus to use?

regards

Re: Self-contact interaction

2008-11-20T20:36:58Z

Hi
I have simpler technique to model your problem which helps to get out of the problem of contact. What you can do is to draw your soil profile as one part. Then start to partition your soil profile according to your excavation where you split your region into lifts based on the sequence of your construction process.
In such way you do not have to worry about the contact because this will make ABAQUS understand that the elements in contact to each other.
I hope that this will help you
Good Luck

Gradient of a material property at integration points

2008-11-20T19:50:00Z

Hi,

I want to determine gradient (divergence) of a materials property at each
integration point. Could somebody give any idea/suggestion on this?

Regards,

Alankar

[Non-text portions of this message have been removed]

Re: Self-contact interaction

2008-11-20T17:49:53Z

try to use CEL methodology in Abaqus/Explicit.

V

________________________________
From: M B <dgnmm77@...>
To: Abaqus@...
Sent: Thursday, November 20, 2008 10:35:14 AM
Subject: [Abaqus] Self-contact interaction

Hi,

I am trying to model a trench excavation and backfilling operation.. after excavating the trench I will backfill it with the same soil, but i am not quite sure about the interaction properties that should be used. I was wondering if i shall use Self-contact modeling (because the soil particles are in contact with the same soil) or a surface to surface contact interaction using a coefficient of friction that I can calculate from the equation m=tanf, where f is the internal friction angle of the soil.
Could anyone please help me with this problem?
Thanks in advance.

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

Self-contact interaction

2008-11-20T07:35:14Z

Hi,

I am trying to model a trench excavation and backfilling operation.. after excavating the trench I will backfill it with the same soil, but i am not quite sure about the interaction properties that should be used. I was wondering if i shall use Self-contact modeling (because the soil particles are in contact with the same soil) or a surface to surface contact interaction using a coefficient of friction that I can calculate from the equation m=tanf, where f is the internal friction angle of the soil.
Could anyone please help me with this problem?
Thanks in advance.

[Non-text portions of this message have been removed]

put load and BC's at node?

2008-11-20T01:48:44Z

i have a matter to put load and BC's at node after meshing. how the way is?
can we do mesh first and then we do load and BC's?? i use abaqus v6.6
i have tried it. but i still can't do that. the mesh is delete

thanks for answer

Rh3_v0

Berbagi foto Flickr dengan teman di dalam Messenger

[Non-text portions of this message have been removed]

Re: Helping in VUMAT (Urgent)

2008-11-20T01:18:26Z

Hello all,

I'm working on the same problem like Moritzio. I also want to simulate commposite material including damage.
I got a VUMAT from ABAQUS Support (3DHashin.for - 3D Orthotropic Elasticity with Hashin 3d Failure criterion). I think it's the same VUMAT you use. Maybe we can share our knowledge about it. I needed a few days to get my first calculation without errors. Now i have the Problem that I dont exactly know what values I need for DEPVAR. I firstly thought i had understand the VUMAT and used 17 for statevar and 5 for element deletion. Because SDV5 is the MpStatus. When I run single element test with these settings i get zero stresses. I tried much higher values for depvar and get stresses, but no element deletion.

Does anyone know what values for Depvar are correct?

Best regards
Mac Gyver

How to export the deformable model of Abaqus to Microsoft Visual Studio

2008-11-19T06:44:47Z

First I use Abaqus 6.7 to do finite element analysis and get the deformable orphan mesh. Then I want to export this deformable model and read it in vc++ for other image processing work, but I do not know how to do it.

STL file could be readed using VTK, but Abaqus 6.7 could not export as STL file. I try to export as other format and convert it in other toolkit like SolidWorks, but there is no use.

What should I do?

Any suggestion will be appreciated.

force response - how to?

2008-11-19T04:41:30Z

hi,

i'm trying to get an force response of one part (solid, 200x200x5mm,
steel material, C3D8I element type) but i don't know exactly how to
do this.

I understand that the first step is to compute an modal analysis
(eigenfreq) -> this is no problem for me. But in second step i need
to define an force (for example 5N from 300Hz to 500Hz) and compute
the second step using the first one. Have anybody uf us some
experiences with this study?

Which second step i should select?
/modal dynamic/ or /response spectrum/ or which one is the correct?

How to define an force 5N dynamically changing from 300Hz to 500Hz?
/modulated?/

thank's all for your opinions and advices

have a nice day

Re: Hashin damage theory

2008-11-19T01:01:32Z

Hello there.

This VUMAt is exactly what I need. Unfortunately it seems that this VUMAT doesn't work with Abaqus 6.7 or 6.8. Can anybody tell me what causes this problem? I think this VUMAT was created for 6.6. Is this correct? Where can i get informations about changes between 6.6 and 6.7/6.8? I looked in the Abaqus Documentation but didn't find what i looked for.

Many thanks for your HELP.

simulation

2008-11-18T17:51:30Z

Hi all;

Can I use Abaqus software to simulate a moving object?.

What is the suitable version of Abaqus to use?

Thank you inadvance.

Re: How to apply initial velocity condition in Abaqus/explicit?

2008-11-18T14:09:19Z

Don't use load, just us the boundary conditions. Double click "BCs", select "Mechanical-->Velocit/Angular velocity", "Continue...", then set the velocity.

tiger-paw wrote:

Instead of applying impulse (pressure loading), I want apply initial velocity (moment converted from impulse) on a solid surface in Abaqus/explicit. However I cannot find velocity-type loading under "Loading". The "moment loading" under "Loading" is to define an angular moment for rotation. Could somebody here inform me how to apply initial velocity/moment condition in Abaqus/explicit? Any comments/suggestion would be highly appreciated.

Re: Pure thermal analysis with Abaqus

2008-11-18T09:08:50Z

Thank you very much for the help. This was my first try at Abaqus,
and indeed I was using a wrong element. I have now achieved a run,
yielding teh result I expected. Thank you again.

Edwin

--- In Abaqus@..., "steve manifold" <s.manifold@...>
wrote:
>
> You are probably using the wrong element. You need to use an
element that has temperature degrees of freedom, such as C3D8T or
DC3D8, to list only two. Look in the Analysis User's Manual under
continuum elements.
>
> A surface with no flux defined on it is assumed to have zero flux,
no need to define a zero flux for it

>
> Steve Manifold
> University of Texas
>
>
> ----- Original Message -----
> From: edwinnyirenda
> To: Abaqus@...
> Sent: Tuesday, November 18, 2008 12:39 AM
> Subject: [Abaqus] Pure thermal analysis with Abaqus
>
>
> Dear ABAQUS users,
>
> I am trying to understand the usage of ABAQUS 6.4 by solving for
> fluxes in a 3-D cuboid of size 15m-by-10m-by-10m under purely

thermal
> conditions. Temperatures are fixed at 8 on one side of the 15m-by-
> 10m face, and at 4 on the opposite side, the other side of
> dimensions 15m-by-10m. All the other boundary faces where the
> temperature is not given should have a boundary flux state of 0.
In
> this way I am trying to simulate the situation of one dimensional
> flow from one side of the 15m-by-10m face to the other side, and
> given that the material conductivity is unity, I expect the
solution
> flux to be (8-4)/10=0.4. After this basic problem is solved I
hope
> to move on to more complex boundary conditions.
>
> Two problems arise.
>
> 1. I am unable to input the boundary fluxes of 0.0. Abaqus
> outputs a message that "A uniformly distributed load must have a
non-
> zero magnitude".
>
> 2. To try and achieve a run, I changed the zero flux to 0.0001.
> The program starts to run, but aborts with the message in the
file
> Job-1.dat
>
> ***ERROR: A HEAT TRANSFER ANALYSIS IS NOT MEANINGFUL SINCE THERE
ARE
> NO TEMPERATURE DEGREES OF FREEDOM IN THE MODEL
>
> How can I input the zero fluxes on boundaries, and how do I
define
> temperature degrees of freedom, seeing that I cannot do it under
Load-

> BC?
>
> Any assistance to get me started will be highly appreciated.
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

Re: Pure thermal analysis with Abaqus

2008-11-18T05:33:11Z

You are probably using the wrong element. You need to use an element that has temperature degrees of freedom, such as C3D8T or DC3D8, to list only two. Look in the Analysis User's Manual under continuum elements.

A surface with no flux defined on it is assumed to have zero flux, no need to define a zero flux for it

Steve Manifold
University of Texas

----- Original Message -----
From: edwinnyirenda
To: Abaqus@...
Sent: Tuesday, November 18, 2008 12:39 AM
Subject: [Abaqus] Pure thermal analysis with Abaqus

Dear ABAQUS users,

I am trying to understand the usage of ABAQUS 6.4 by solving for
fluxes in a 3-D cuboid of size 15m-by-10m-by-10m under purely thermal
conditions. Temperatures are fixed at 8 on one side of the 15m-by-
10m face, and at 4 on the opposite side, the other side of
dimensions 15m-by-10m. All the other boundary faces where the
temperature is not given should have a boundary flux state of 0. In
this way I am trying to simulate the situation of one dimensional
flow from one side of the 15m-by-10m face to the other side, and
given that the material conductivity is unity, I expect the solution
flux to be (8-4)/10=0.4. After this basic problem is solved I hope
to move on to more complex boundary conditions.

Two problems arise.

1. I am unable to input the boundary fluxes of 0.0. Abaqus
outputs a message that "A uniformly distributed load must have a non-
zero magnitude".

2. To try and achieve a run, I changed the zero flux to 0.0001.
The program starts to run, but aborts with the message in the file
Job-1.dat

***ERROR: A HEAT TRANSFER ANALYSIS IS NOT MEANINGFUL SINCE THERE ARE
NO TEMPERATURE DEGREES OF FREEDOM IN THE MODEL

How can I input the zero fluxes on boundaries, and how do I define
temperature degrees of freedom, seeing that I cannot do it under Load-
BC?

Any assistance to get me started will be highly appreciated.

[Non-text portions of this message have been removed]

Re: Re: meshing in Abaqus like Ansys

2008-11-18T04:48:55Z

> Well that leads to a complete lack of variety, if
everyone has the

> same features implemented in the same way! My recommendation is to

> LEARN to use the tool that comes with the software.

I don’t get the point, are you saying that a FE package
shouldn’t be improved and equipped with capabilities from the other software in
order to keep the “variety”? Then just check the ABAQUS/CAE python scripting
language (to me this is the level of sophistication to communicate with a
software) and you’ll see the newly implemented methods are quite similar to
those available in APDL (e.g. getElementFaces(...) added in 6.8). Obviously, this
is not the matter of LEARNING the tools; it’s the matter of EFFICIENCY of the
tools.

> If you need something more advanced, or you have
different analysis packages for

> different things, but need a uniform interface, then use a specialized

> mesher (Hypermesh, I-DEAS, Patran,...). The same goes for postprocessing.

With ANSYS you’ll never need another specialized ("compute-aided
engineering”) program for mesh generation, all you need is in there as an “Integrated
Environments” which was the point in my post.

> WRONG. The solver has been under development since the
'70s, while the

> current version of CAE has less than 10 years. If you look at the CAE

> version that shipped with ABAQUS 6.2 or 6.3, you will see the

> extremely fast development pace, and if you have used two or three

> consecutive versions, you will acknowledge that significant

> improvements keep coming steadily. This is not to say that CAE should

> be the tool of choice for everyone ;-)

Apparently, I didn’t intend to compare the rate of
development. I made the comparison between the analysis capabilities vs. preprocessing/postprocessing
in CAE.

I started to work with CAE shipped with ABAUQS 5.8 and since
then I impatiently wait to see complete APDL (and ANSYS) capabilities in CAE. This is not a fast development pace to me Fernando.
Cheers

Maziar

[Non-text portions of this message have been removed]

Re: how to get force generated by bolt load?

2008-11-18T04:21:32Z

Does it generate a *PRETENSION in the .inp ? If so, ask for RF of
the pretension node, and check the result in the .dat.

BenZ

--- In Abaqus@..., CABROL Eric <eric.cabrol-
renexter@...> wrote:
>
> If there's a contact interaction between the bolted parts, you can
sum the

> contact forces normal to the surfaces.
>
> EC
>
> ----- Original Message -----
> From: "engr.lou18" <engr.lou18@...>
> To: <Abaqus@...>
> Sent: Monday, November 17, 2008 10:02 AM
> Subject: [Abaqus] how to get force generated by bolt load?
>
>
> > Hi to all of the members of this group!
> >
> > I would like to ask, how can i get the force or stress generated

by
> > the bolt load option in abaqus odb?
> >
> > to make it more clear, i used the "adjust length" option in the
bolt
> > load in CAE load module, after the analysis, i would like to know
> > how much force did abaqus use to adjust the length of the bolt.
i
> > tried using the section forces option but it is way different
from
> > my expected value. i know i can use the formula d=PL/AE but i
just
> > want to check if abaqus will give me the same figures so i could
> > justify my results.
> >
> > also, if i use the "apply force" option, i get severely distorted
> > elements. so i just used the other option. nonetheless, i just
> > want to know how can i get the stress or force on the bolt upon
the
> > application of the bolt load pretensioning.
> >
>
>
> -- Disclaimer ------------------------------------
> Ce message ainsi que les eventuelles pieces jointes constituent
une correspondance privee et confidentielle a l'attention exclusive
du destinataire designe ci-dessus. Si vous n'etes pas le
destinataire du present message ou une personne susceptible de
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> ***
> This e-mail and any attachments is a confidential correspondence
intended only for use of the individual or entity named above. If
you are not the intended recipient or the agent responsible for
delivering the message to the intended recipient, you are hereby
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communication in error, please notify the sender by phone or by
replying this message, and then delete this message from your system.
>

Re: Pure thermal analysis with Abaqus

2008-11-18T04:20:10Z

Just make... nothing ! Like a zero load in mechanics...!

BenZ

--- In Abaqus@..., "edwinnyirenda" <edwinnyirenda@...>
wrote:
>
> Dear ABAQUS users,
>
> I am trying to understand the usage of ABAQUS 6.4 by solving for
> fluxes in a 3-D cuboid of size 15m-by-10m-by-10m under purely
thermal
> conditions. Temperatures are fixed at 8 on one side of the 15m-by-
> 10m face, and at 4 on the opposite side, the other side of
> dimensions 15m-by-10m. All the other boundary faces where the
> temperature is not given should have a boundary flux state of 0.
In
> this way I am trying to simulate the situation of one dimensional
> flow from one side of the 15m-by-10m face to the other side, and
> given that the material conductivity is unity, I expect the
solution
> flux to be (8-4)/10=0.4. After this basic problem is solved I
hope
> to move on to more complex boundary conditions.
>
> Two problems arise.
>
> 1. I am unable to input the boundary fluxes of 0.0. Abaqus
> outputs a message that "A uniformly distributed load must have a
non-
> zero magnitude".
>
> 2. To try and achieve a run, I changed the zero flux to
0.0001.
> The program starts to run, but aborts with the message in the file
> Job-1.dat
>
> ***ERROR: A HEAT TRANSFER ANALYSIS IS NOT MEANINGFUL SINCE THERE
ARE
> NO TEMPERATURE DEGREES OF FREEDOM IN THE MODEL
>
> How can I input the zero fluxes on boundaries, and how do I define
> temperature degrees of freedom, seeing that I cannot do it under
Load-
> BC?
>
> Any assistance to get me started will be highly appreciated.
>

Re: meshing in Abaqus like Ansys

2008-11-18T04:18:41Z

Heyhey, no, you are a serious analyst ! I haven't spoken about ANSA
because I really think it's not so common nowadays in Automotive...
Or maybe for crash that I don't know well ??? But OK, ANSA is a
great tool that should have been quoted !

To others, I won't go into my own troll, I may just advice to speak
with skilled Ansys users (10-15 years) and to make competition on
own benchs with them in some Abaqus-vs-Ansys trials ! Make your own
opinion, you'll see...

BenZ.

--- In Abaqus@..., CABROL Eric <eric.cabrol-
renexter@...> wrote:
>
>
> From: "BenZ" <benjamin_hagege@...>
>
>
>
> > Don't try to use Abaqus like Ansys, it is simply...
impossible...
> > One of the biggest lack of Abaqus/CAE is the power of selection
on
> > entities. Abaqus is NOT meshing tool, Abaqus is a code. All
serious
> > FEA analysts use Hypermesh, I-Deas or ICEM CFD to generate
meshes.

>
> Damned, I'm not a serious analyst !
>
>
> Eric, Ansa user
>
>
>
> -- Disclaimer ------------------------------------
> Ce message ainsi que les eventuelles pieces jointes constituent

une correspondance privee et confidentielle a l'attention exclusive
du destinataire designe ci-dessus. Si vous n'etes pas le
destinataire du present message ou une personne susceptible de
pouvoir le lui delivrer, il vous est signifie que toute divulgation,
distribution ou copie de cette transmission est strictement
interdite. Si vous avez recu ce message par erreur, nous vous
remercions d'en informer l'expediteur par telephone ou de lui
retourner le present message, puis d'effacer immediatement ce
message de votre systeme.
> ***
> This e-mail and any attachments is a confidential correspondence
intended only for use of the individual or entity named above. If
you are not the intended recipient or the agent responsible for
delivering the message to the intended recipient, you are hereby
notified that any disclosure, distribution or copying of this
communication is strictly prohibited. If you have received this
communication in error, please notify the sender by phone or by
replying this message, and then delete this message from your system.
>

Interaction problems in abaqus

2008-11-18T03:36:29Z

I am currently doing an impact test between an object an a floor, the simulation works fine when the velocity is put through pre-defined fields but when I supress this and put the velocity in through boundary conditions the object goes through the floor as if it wasn't there. The boundry conditions are defined in the same step as the interaction but it still travels through the floor, I cant understand why this is happening and dont know how to fix it so any help would be greatly appreciated.

Thanks,
Gareth

Re: how to get force generated by bolt load?

2008-11-17T23:01:25Z

If there's a contact interaction between the bolted parts, you can sum the
contact forces normal to the surfaces.

EC

----- Original Message -----
From: "engr.lou18" <engr.lou18@...>
To: <Abaqus@...>
Sent: Monday, November 17, 2008 10:02 AM
Subject: [Abaqus] how to get force generated by bolt load?

> Hi to all of the members of this group!
>
> I would like to ask, how can i get the force or stress generated by
> the bolt load option in abaqus odb?
>
> to make it more clear, i used the "adjust length" option in the bolt
> load in CAE load module, after the analysis, i would like to know
> how much force did abaqus use to adjust the length of the bolt. i
> tried using the section forces option but it is way different from
> my expected value. i know i can use the formula d=PL/AE but i just
> want to check if abaqus will give me the same figures so i could
> justify my results.
>
> also, if i use the "apply force" option, i get severely distorted
> elements. so i just used the other option. nonetheless, i just
> want to know how can i get the stress or force on the bolt upon the
> application of the bolt load pretensioning.
>

-- Disclaimer ------------------------------------
Ce message ainsi que les eventuelles pieces jointes constituent une correspondance privee et confidentielle a l'attention exclusive du destinataire designe ci-dessus. Si vous n'etes pas le destinataire du present message ou une personne susceptible de pouvoir le lui delivrer, il vous est signifie que toute divulgation, distribution ou copie de cette transmission est strictement interdite. Si vous avez recu ce message par erreur, nous vous remercions d'en informer l'expediteur par telephone ou de lui retourner le present message, puis d'effacer immediatement ce message de votre systeme.
***
This e-mail and any attachments is a confidential correspondence intended only for use of the individual or entity named above. If you are not the intended recipient or the agent responsible for delivering the message to the intended recipient, you are hereby notified that any disclosure, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender by phone or by replying this message, and then delete this message from your system.

Re: Re: meshing in Abaqus like Ansys

2008-11-17T22:56:56Z

From: "BenZ" <benjamin_hagege@...>

> I've already told Mme Alexandre in France : Abaqus should employ ex-
> Ansys engineers or, at least, try to understand how Ansys is built
> in order to perform significant improvements in Abaqus that is a
> quite old-fashioned FE tool... So is MSC.Nastran, the worst code to
> use...!

Probably due to the documentation, which is undoubtedly awful.
As a Nastran and Abaqus daily user, I obviously prefer the latter. And I
don't say this because we are on an Abaqus-dedicated mailing-list ...

Eric

-- Disclaimer ------------------------------------
Ce message ainsi que les eventuelles pieces jointes constituent une correspondance privee et confidentielle a l'attention exclusive du destinataire designe ci-dessus. Si vous n'etes pas le destinataire du present message ou une personne susceptible de pouvoir le lui delivrer, il vous est signifie que toute divulgation, distribution ou copie de cette transmission est strictement interdite. Si vous avez recu ce message par erreur, nous vous remercions d'en informer l'expediteur par telephone ou de lui retourner le present message, puis d'effacer immediatement ce message de votre systeme.
***
This e-mail and any attachments is a confidential correspondence intended only for use of the individual or entity named above. If you are not the intended recipient or the agent responsible for delivering the message to the intended recipient, you are hereby notified that any disclosure, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender by phone or by replying this message, and then delete this message from your system.

Re: Re: meshing in Abaqus like Ansys

2008-11-17T22:53:07Z

From: "BenZ" <benjamin_hagege@...>

> Don't try to use Abaqus like Ansys, it is simply... impossible...
> One of the biggest lack of Abaqus/CAE is the power of selection on
> entities. Abaqus is NOT meshing tool, Abaqus is a code. All serious
> FEA analysts use Hypermesh, I-Deas or ICEM CFD to generate meshes.

Damned, I'm not a serious analyst !

Eric, Ansa user

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Re: Re: meshing in Abaqus like Ansys

2008-11-17T22:48:41Z

> I am a relatively new user to Abaqus (1yr). I saw some of features in
> Ansys
> and liked it,
> but then I can not ask my advisor to get license of Ansys just for my
> trial
> and that was the
> primary reason, I wanted to know what software advanced people use for
> meshing.

In the (at least european) automotive industry, Ansa is a very common tool
for meshing and pre-processing.
But if you don't have access to commercial softwares, except Abaqus/CAE ...

Eric Cabrol

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Pure thermal analysis with Abaqus

2008-11-17T22:39:17Z

Dear ABAQUS users,

I am trying to understand the usage of ABAQUS 6.4 by solving for
fluxes in a 3-D cuboid of size 15m-by-10m-by-10m under purely thermal
conditions. Temperatures are fixed at 8 on one side of the 15m-by-
10m face, and at 4 on the opposite side, the other side of
dimensions 15m-by-10m. All the other boundary faces where the
temperature is not given should have a boundary flux state of 0. In
this way I am trying to simulate the situation of one dimensional
flow from one side of the 15m-by-10m face to the other side, and
given that the material conductivity is unity, I expect the solution
flux to be (8-4)/10=0.4. After this basic problem is solved I hope
to move on to more complex boundary conditions.

Two problems arise.

1. I am unable to input the boundary fluxes of 0.0. Abaqus
outputs a message that "A uniformly distributed load must have a non-
zero magnitude".

2. To try and achieve a run, I changed the zero flux to 0.0001.
The program starts to run, but aborts with the message in the file
Job-1.dat

***ERROR: A HEAT TRANSFER ANALYSIS IS NOT MEANINGFUL SINCE THERE ARE
NO TEMPERATURE DEGREES OF FREEDOM IN THE MODEL

How can I input the zero fluxes on boundaries, and how do I define
temperature degrees of freedom, seeing that I cannot do it under Load-
BC?

Any assistance to get me started will be highly appreciated.

exporting connector forces

2008-11-17T15:08:23Z

Dear all,

I have a simple question about exporting connector force information from abaqus. I have successfully created a FE model of the human knee joint in abaqus. This model is comprised of 4 bones (modeled as rigid bodies), 2 deformable components as the cartilage surfaces of the bones in contact, and 2 sets of tension only elements connecting various components of my model together.

I’m applying the simulated muscles forces to my model as connector forces through tension only connectors to the top of the system as shown in the attached figure. The second set of tension only connectors on the bottom of the system should experience a certain amount of force as a result. How can I find out how much of my applied forces from the top set of connectors has been transferred to the connectors on the bottom? Thanks for you help.

Re: (unknown)

2008-11-17T10:26:45Z

Use *DLOAD with HP as the distributed load type label. Details of this are described in the user's manual.

Steve Manifold
University of Texas

----- Original Message -----
From: ramesh ramesh
To: Abaqus@...
Sent: Monday, November 17, 2008 1:41 AM
Subject: [Abaqus] (unknown)

hi
i am doing an analysis of a dam
i would like to give hydrostatic pressure for this dam
how to give hydrostatic pressure for a dam using abaqus
ur help will be highly apreciated

with love
ramesh

Add more friends to your messenger and enjoy! Go to http://messenger.yahoo.com/invite/

[Non-text portions of this message have been removed]

Re: Re: meshing in Abaqus like Ansys

2008-11-17T05:31:53Z

Hi All,

Thanks for the response to my original email.
The good thing about Abaqus I like is that it allows to use the mesh
generated by
other softwares in input file and that was the main reason I am looking for
an alternative.
I am a relatively new user to Abaqus (1yr). I saw some of features in Ansys
and liked it,
but then I can not ask my advisor to get license of Ansys just for my trial
and that was the
primary reason, I wanted to know what software advanced people use for
meshing.

Some people in my college have codes written for their group, but the code
generated
mesh specific to their problem and I don't have access to those codes and I
didn't wanted to spend
my time writing my own code for generating mesh.

Some time ago i hear about a pre and post processor called GID, but i am not
sure how good it is and that was the primary reason of asking for
suggestions.
Anyway, I will give a try to free version of "Hypermesh" and see how it
goes.

Thanks

Sincerely,
Devvrath Khatri
---
Graduate Student
California Institute of Technology (Caltech)

-----------------------------------------------------------
Ubuntu - Linux for Human Being
http://www.ubuntu.com/

On Mon, Nov 17, 2008 at 4:52 AM, Fernando <who.is.mailing.me@...>wrote:

>
> > The best way for a FE package to evolve and get better is to
> > watch the advantages of the other packages(or user feedbacks) and
> > implement them.
>
> Well that leads to a complete lack of variety, if everyone has the
> same features implemented in the same way! My recommendation is to
> LEARN to use the tool that comes with the software. If you need
> something more advanced, or you have different analysis packages for
> different things, but need a uniform interface, then use a specialized
> mesher (Hypermesh, I-DEAS, Patran,...). The same goes for postprocessing.
>
> > I definitely do agree with BenZ and just hope that ABAQUS
> > reconsiders improving the concepts of CAE.
>
> I think you are confusing CAE with the standard abbreviation. CAE
> means "Comprehensive Analysis Environment", and its aim is (was?) to
> provide a graphical environment where the user could create an input
> file, submit it, and review the results. With time its preprocessing
> capabilities have improved a lot, but it is still no match for
> SolidWorks or CATIA. If you want a CAE package (as "compute-aided
> engineering), get CATIA or Solidworks, which are produced by the
> current owners of ABAQUS.
>
> > Compared to the strong ABAQUS solver, material models ..., CAE is
> > being developed very slowly.
>
> WRONG. The solver has been under development since the '70s, while the
> current version of CAE has less than 10 years. If you look at the CAE
> version that shipped with ABAQUS 6.2 or 6.3, you will see the
> extremely fast development pace, and if you have used two or three
> consecutive versions, you will acknowledge that significant
> improvements keep coming steadily. This is not to say that CAE should
> be the tool of choice for everyone ;-) If you need specialized tools,
> there are good standalone meshers out there (see BenZ's post), as well
> as standalone postprocessors (Hyperview, EnSight, I-DEAS...).
> As someone else said, you have to learn the rationale of each
> software, often the techniques that go for one package cannot
> translate to another.
>
> Anyway, enough of a flame for today :-)
>
> HTH
> Fernando
>
>
>

[Non-text portions of this message have been removed]

Re: meshing in Abaqus like Ansys

2008-11-17T04:52:13Z

> The best way for a FE package to evolve and get better is to
> watch the advantages of the other packages(or user feedbacks) and
> implement them.

Well that leads to a complete lack of variety, if everyone has the
same features implemented in the same way! My recommendation is to
LEARN to use the tool that comes with the software. If you need
something more advanced, or you have different analysis packages for
different things, but need a uniform interface, then use a specialized
mesher (Hypermesh, I-DEAS, Patran,...). The same goes for postprocessing.

> I definitely do agree with BenZ and just hope that ABAQUS
> reconsiders improving the concepts of CAE.

I think you are confusing CAE with the standard abbreviation. CAE
means "Comprehensive Analysis Environment", and its aim is (was?) to
provide a graphical environment where the user could create an input
file, submit it, and review the results. With time its preprocessing
capabilities have improved a lot, but it is still no match for
SolidWorks or CATIA. If you want a CAE package (as "compute-aided
engineering), get CATIA or Solidworks, which are produced by the
current owners of ABAQUS.

> Compared to the strong ABAQUS solver, material models ..., CAE is
> being developed very slowly.

WRONG. The solver has been under development since the '70s, while the
current version of CAE has less than 10 years. If you look at the CAE
version that shipped with ABAQUS 6.2 or 6.3, you will see the
extremely fast development pace, and if you have used two or three
consecutive versions, you will acknowledge that significant
improvements keep coming steadily. This is not to say that CAE should
be the tool of choice for everyone ;-) If you need specialized tools,
there are good standalone meshers out there (see BenZ's post), as well
as standalone postprocessors (Hyperview, EnSight, I-DEAS...).
As someone else said, you have to learn the rationale of each
software, often the techniques that go for one package cannot
translate to another.

Anyway, enough of a flame for today :-)

HTH
Fernando

how to get force generated by bolt load?

2008-11-17T01:02:39Z

Hi to all of the members of this group!

I would like to ask, how can i get the force or stress generated by
the bolt load option in abaqus odb?

to make it more clear, i used the "adjust length" option in the bolt
load in CAE load module, after the analysis, i would like to know
how much force did abaqus use to adjust the length of the bolt. i
tried using the section forces option but it is way different from
my expected value. i know i can use the formula d=PL/AE but i just
want to check if abaqus will give me the same figures so i could
justify my results.

also, if i use the "apply force" option, i get severely distorted
elements. so i just used the other option. nonetheless, i just
want to know how can i get the stress or force on the bolt upon the
application of the bolt load pretensioning.

i hope someone can help me on this soon. thanks very much in
advance.

Regards,
Louissa Ridad
MS Student
Korea

(unknown)

2008-11-16T23:41:53Z

hi
i am doing an analysis of a dam
i would like to give hydrostatic pressure for this dam
how to give hydrostatic pressure for a dam using abaqus
ur help will be highly apreciated

with love
ramesh

Add more friends to your messenger and enjoy! Go to http://messenger.yahoo.com/invite/