impact-users — Help, Comments & Discussions regarding Impact

[Impact-users] Use of Impact as a library

[Martin B. <zon...@gm...>]

Hello list!

I am planning a physics based game in the vein of
http://www.sparkworkz.com/fc2/ and other similar games (yes, physics
based games are very popular at the moment :), and I was wondering, do
you think it is possible to

1) Use Impact (or parts of Impact) as a simple library to
programatically create structures, simulate them and fetch the results
for animation in a game?
2) Do this in 2d by for example just defining the z coordinate to be 0
for all nodes I create?

First I had a crazy idea to either extend an existing 2d physics
engine such as jbox2d or create a new one with FEM support, but I have
realized that understanding the finite element method well enough to
do it properly is probably out of the scope of my project :/

regards,
//Martin Bruse

Re: [Impact-users] apply contacts on alerady existing elements

[Jonas F. <jon...@ya...>]

Hello Florent,
If I remember correctly, contact elements are included as default in the normal shell elements and enabled by a contact option for each element. You will have to make sure that this option is included on each element and perhaps change if needed.
You therefore do not need to define any specific contact elements in addition to the normal elements.
Check the manual for the element types and have a look at the examples in Impact.

Regards/Jonas Forssell
--- Den ons 2010-07-21 skrev florent combes <com...@gm...>:

Från: florent combes <com...@gm...>
Ämne: [Impact-users] apply contacts on alerady existing elements
Till: imp...@li...
Datum: onsdag 21 juli 2010 15:56

Hello,

I would like to know how can I do to apply some contacts on a structure that I import in .nas .
The structure is very huge so I can't take the time to create Contact_Triangles on the whole surface by picking the nodes one after the other. So Haw can I make impact define it on its own?


Thanks.


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[Impact-users] apply contacts on alerady existing elements

[florent c. <com...@gm...>]

Hello,

I would like to know how can I do to apply some contacts on a structure that
I import in .nas .
The structure is very huge so I can't take the time to create
Contact_Triangles on the whole surface by picking the nodes one after the
other. So Haw can I make impact define it on its own?

Thanks.

[Impact-users] possible: formfinding with soft fabric material?! (von Sturm)

[pablo p d. c. <pab...@ya...>]

Do not forget that you need to implement a new material and new solver like dynamic relaxation, in reality dynamic relaxation is a natural preconditioning.

Pablo



      

[Impact-users] Is Impact-Users still alive?

[jmb <jm...@gm...>]

Hello,

I am trying to find a list of bug fixes in the various versions of
Impact, but have not found them on Sourceforge, the Wiki or the unZipped
directory.   Currently, I have installed Impact-0.7.6.20 in an Ubuntu
9.04 Jaunty 64bit PC.  Any idea where I can read about changes to the
program?

Regards,
JMB

Re: [Impact-users] Impact poll

[Markus H. <ma...@ju...>]

Am 27.12.2008 um 21:04 schrieb Jonas Forssell:

> It would help to hear from you users on what to focus on.

Likely, it would be a good idea to set up packages for the major  
Linux distros (apt, rpm). I must admit I tried Impact about a year  
ago on Mac OS X, but Impact failed to even draw it's buttons and was  
next to useless. So I gave up pretty quickly.

Many engineers use Linux today and state of the art would be to type  
"sudo apt-get install impact" to get some useable form of Impact  
installed for evaluation.

Launchpad/Ubuntu's "Personal Package Archive" has free server  
capacity, for example.


Regarding user interface - the less interaction and the less thinking  
about implementation details a user needs, the more value a software  
has. Automatic mapping from geometrical surfaces to element nodes  
comes to mind. Engineers often need to re-iterate their designs, it  
would be great if Impact would allow to exchange geometry while  
keeping materials, forces, etc..


Regarding science - some comparison of Impact's results with analytic  
solutions and/or experimental measured results would be great.


If some of the above exists already, please forgive me for not  
researching the topic before writing here.


MarKus

- - - - - - - - - - - - - - - - - - -
Dipl. Ing. Markus Hitter
http://www.jump-ing.de/

Re: [Impact-users] Impact poll

[Alexander R. <ale...@ia...>]

Hello, Jonas

As I haven't found the solution by myself :(, I would complain again: 
Impact doesn't write down global strains for tetrahedral elements 
(Solid_Iso_4) from elastoplastic materials. It is so for the simpliest 
elastoplastic material as in help:
STEEL_EP E = 210 RHO = 0.0000078 NU = 0.3 YIELD_STRESS = 0.180 EP = 0.1

Just elastic material is fine. The solution itself (deformations) seems 
to be adequate, but the strains and stresses are written as zeroes.

Jonas Forssell wrote:
> Dear Impact users,
>
> I'm concidering starting work on Impact again (pending available time).
>
> It would help to hear from you users on what to focus on.
>
> Please help me by sending a line or two on what improvements you want 
> me to focus on.
>
> Thanks!
> Best wishes for the New Year
> /Jonas
>
>
With respect
Alexander Rabtchevich

Re: [Impact-users] possible: formfinding with soft fabric material?!

[Jonas F. <jon...@ya...>]

Interesting. In principle it should work, but....

Impact only supports isotropic material at the moment so if the fabric has different stiffnesses in different directions you need to write a new material module to get good results.

/Jonas

--- Den fre 2008-12-05 skrev von Sturm <cvo...@gm...>:
Från: von Sturm <cvo...@gm...>
Ämne: [Impact-users] possible: formfinding with soft fabric material?!
Till: imp...@li...
Datum: fredag 5 december 2008 21.12




 
 






hello there, 

   

i want to use impact to do some formfindings of a membrane
with soft fabric material and defined loads. Is this possible to do with
impact?! 

   

Thanks for any help in advance, christoph. 



 

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[Impact-users] Impact poll

[Jonas F. <jon...@ya...>]

Dear Impact users,

I'm concidering starting work on Impact again (pending available time).

It would help to hear from you users on what to focus on.

Please help me by sending a line or two on what improvements you want me to focus on.

Thanks!
Best wishes for the New Year
/Jonas



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[Impact-users] possible: formfinding with soft fabric material?!

[von S. <cvo...@gm...>]

hello there,

 

i want to use impact to do some formfindings of a membrane with soft fabric
material and defined loads. Is this possible to do with impact?!

 

Thanks for any help in advance, christoph.

[Impact-users] Still getting

[Brenda E. M. <bre...@ya...>]

Hi,

Impact still seems not to be able to use tetahedrons.
I tried it with Gmsh .msh from 2.2.5

It still throws:
java.lang.IllegalArgumentException: Unknown Solid (Hexahedran) element 
parameter  in line: x

....where x=some line with only 4 nodes.

I added this to the buglist.

Thank You,
BrendaEM

Re: [Impact-users] Cannot Seem to Use Tetrahedrons from Gmsh

[Brenda E. M. <bre...@ya...>]

Hi,

I did another experiment with gmsh, which failed as the others,
but noting that Gmsh reports 0 (zero) hexahedra.
This appears to be a bug/defect in Impact.

I found some Impact code online, perhaps the area at the bottom is the 
area that's dumping the error

 while (i < param.length) {
  491          if (param[i].getw().toUpperCase().equals("NODES") && param[i + 1].getw().toUpperCase().equals("=")) {
  492             if (!param[i + 2].getw().toUpperCase().startsWith("[") || !param[i + 2].getw().toUpperCase().endsWith("]")) {
  493                throw new java.text.ParseException("Error, node number definition should be [nodenr1,nodenr2,nodenr3,nodenr4,nodenr5,nodenr6,nodenr7,nodenr8]", lineno);
  494             }
  495             try {
  496                for (j = 0; j < 8; j++) {
  497                   this.node[j] = super.findNode(super.getNodeNumber(j + 1, param[i + 2].getw()), nodetable);
  498                }
  499             }  catch (IllegalArgumentException e) {
  500                throw new java.text.ParseException(e.getMessage(), lineno);
  501             }
  502             i += 3;
  503             this.Nodes_are_set = true;
  504          } else if (param[i].getw().toUpperCase().equals("MATERIAL") && param[i + 1].getw().toUpperCase().equals("=")) {
  505             try {
  506                this.material[0] = super.findMaterial(param[i + 2].getw().toUpperCase(), materiallist);
  507                i += 3;
  508                this.Material_is_set = true;
  509             }  catch (IllegalArgumentException e) {
  510                throw e;
  511             }
  512          } else if (param[i].getw().toUpperCase().equals("NIP") && param[i + 1].getw().toUpperCase().equals("=")) {
  513             this.number_of_integration_points = (int)param[i + 2].getn();
  514             i += 3;
  515             this.NIP_is_set = true;
  516          } else if (param[i].getw().toUpperCase().equals("AHR") && param[i + 1].getw().toUpperCase().equals("=")) {
  517             this.AHR = param[i + 2].getn();
  518             i += 3;
  519             this.AHR_is_set = true;
  520          } else {
  521             throw new java.text.ParseException("Unknown Solid (Hexahedran) element parameter ", lineno);
  522          }
  523       }

Take Care,
BrendaEM




Brenda Ellen Make wrote:
> Hi,
>
> I've run some other experiments:
>     A smaller model, using much less tets
>     Both Tetgen and Netgen meshers from Gmsh
>     Different Materials
>     Changing the (Windows) commandline to:
>          java -Xmx2000m -cp .;doc;bin;Impact.jar run.Impact %1
>
> I am still getting the same error.
> java.lang.IllegalArgumentException: Unknown Solid (Hexahedran) element 
> parameter  in line:xxxx
> ...where x=a line with only 4 nodes.
>
> I don't have a dualboot at the moment, but I may try it on Linux too.
>
> Any help would be appreciated,
> All meshed up, and no where to FEA : O
> BrendaEM
>
>
> Brenda Ellen Make wrote:
>> Hi
>>
>> I'm still wanting to find a FEA/FEM to learn how to design things  
>> better, see how they break, etc.
>>
>> When doing a moderate example in Impact, I get these:
>>     java.lang.IllegalArgumentException: Unknown Solid (Hexahedran) 
>> element parameter  in line: 5610
>>
>> Looking up that node, I find that:
>>     5610     nodes = [285,1157,895,1160]     T = 1.0     Material = 
>> Brenda     NIP = 1
>>
>> I've tried both algorithms in gmsh, and the error still ocurrs.
>> The mesh looks valid.
>>
>> /The Brenda Material is just a very elastic material made from a 
>> suggestion from the Impact list:
>>     Brenda E = 193.0435 NU = 0.29 RHO = 0.00000803 FAILURE_STRESS = 
>> 4481367 YIELD_STRESS = 3309316 EP = 0.1/
>>
>> Any help would be appreciated,
>


-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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http://www.brendamake.com/numbers/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Re: [Impact-users] Cannot Seem to Use Tetrahedrons from Gmsh

[Brenda E. M. <bre...@ya...>]

Hi,

I've run some other experiments:
    A smaller model, using much less tets
    Both Tetgen and Netgen meshers from Gmsh
    Different Materials
    Changing the (Windows) commandline to:
         java -Xmx2000m -cp .;doc;bin;Impact.jar run.Impact %1

I am still getting the same error.
java.lang.IllegalArgumentException: Unknown Solid (Hexahedran) element 
parameter  in line:xxxx
....where x=a line with only 4 nodes.

I don't have a dualboot at the moment, but I may try it on Linux too.

Any help would be appreciated,
All meshed up, and no where to FEA : O
BrendaEM


Brenda Ellen Make wrote:
> Hi
>
> I'm still wanting to find a FEA/FEM to learn how to design things  
> better, see how they break, etc.
>
> When doing a moderate example in Impact, I get these:
>     java.lang.IllegalArgumentException: Unknown Solid (Hexahedran) 
> element parameter  in line: 5610
>
> Looking up that node, I find that:
>     5610     nodes = [285,1157,895,1160]     T = 1.0     Material = 
> Brenda     NIP = 1
>
> I've tried both algorithms in gmsh, and the error still ocurrs.
> The mesh looks valid.
>
> /The Brenda Material is just a very elastic material made from a 
> suggestion from the Impact list:
>     Brenda E = 193.0435 NU = 0.29 RHO = 0.00000803 FAILURE_STRESS = 
> 4481367 YIELD_STRESS = 3309316 EP = 0.1/
>
> Any help would be appreciated,

Re: [Impact-users] Use of com.stevesoft.pat.regex

[Jonas F. <jon...@ya...>]

Make sure to include all .jar files in Impact/lib in the build path for your project.
It should then compile

/Jonas

--- Den fre 2008-07-25 skrev Fathi El Yafi <fat...@fr...>:
Från: Fathi El Yafi <fat...@fr...>
Ämne: [Impact-users] Use of com.stevesoft.pat.regex
Till: imp...@li...
Datum: fredag 25 juli 2008 19.34




 
 






Hi, 

   

I downloaded
Impact source code and I tried to compile it with NetBeans IDE 6.1. 

I have a lot of
error messages because it needs com.stevesoft.pat.regex 

Anybody can tell
me how to find this library and download it? 

   

Thanks for your
help 

Best regards 

   

Note: This is my
first experience with JAVA, but I am more familiar with C#. 

   

El-Yafi 

   

   



 

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[Impact-users] submission4mailing list

[Praful D. <pra...@gm...>]

[Impact-users] Use of com.stevesoft.pat.regex

[Fathi El Y. <fat...@fr...>]

Hi,

 

I downloaded Impact source code and I tried to compile it with NetBeans IDE
6.1.

I have a lot of error messages because it needs com.stevesoft.pat.regex

Anybody can tell me how to find this library and download it?

 

Thanks for your help

Best regards

 

Note: This is my first experience with JAVA, but I am more familiar with C#.

 

El-Yafi

 

 

Re: [Impact-users] How to impart rotational velocity using VRX VRY etc...

[Alain <J-A...@sy...>]

Hi Jens,

I have tried all sort of schemes to get this to work. It seems that if I 
used VRX on a non-rigid_body, the initial movement is around the center 
of mass of my model. After a while in the simulation, it starts turning 
around my defined (witth boundary conditions) center axis. Why? Does it 
mean that I have to use ARX first to accelerate to de desired speed?
Thanks again
-Alain


Alain wrote:
> Jens Bomholt wrote:
>   
>> Hi Alain
>>
>> Have you tryed to look at this example in the folder:
>>
>> /Impact/examples/3.in <http://3.in>
>>
>> I hope that helps!
>>
>> Regards
>> JB
>>
>> 2008/7/7 Alain <J-A...@sy... <mailto:J-A...@sy...>>:
>>
>>     Hello All,
>>     I am trying to give a constant rotational velocity to my model
>>     using the
>>     B.C. constraint VRX = 1  or any  of the "R" constraint parameter.  It
>>     does not matter if I  used a predefined AXIS or not,  I  never get any
>>     move from setting this parameter.
>>     What unit is used for this parameter anyway? Is it m/sec or
>>     radian/second? Is this the proper method to use? What else can I do to
>>     get what I want? Is it doable?
>>     Thanks,
>>     -Alain
>>
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>>     
> Thank you very much for the hint. It is now obvious to me that it only 
> works for RIGID_BODY and the rotational speed is in radian/second.
> Now, is it possible to rotate in two perpendicular axes simultaneously? 
> Around a specified point and axes. In other words, can I specified two 
> different axes for VRX and VRY?
> Thanks,
> -Alain
>
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Re: [Impact-users] How to impart rotational velocity using VRX VRY etc...

[Alain <J-A...@sy...>]

Jens Bomholt wrote:
> Hi Alain
>
> Have you tryed to look at this example in the folder:
>
> /Impact/examples/3.in <http://3.in>
>
> I hope that helps!
>
> Regards
> JB
>
> 2008/7/7 Alain <J-A...@sy... <mailto:J-A...@sy...>>:
>
>     Hello All,
>     I am trying to give a constant rotational velocity to my model
>     using the
>     B.C. constraint VRX = 1  or any  of the "R" constraint parameter.  It
>     does not matter if I  used a predefined AXIS or not,  I  never get any
>     move from setting this parameter.
>     What unit is used for this parameter anyway? Is it m/sec or
>     radian/second? Is this the proper method to use? What else can I do to
>     get what I want? Is it doable?
>     Thanks,
>     -Alain
>
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>
Thank you very much for the hint. It is now obvious to me that it only 
works for RIGID_BODY and the rotational speed is in radian/second.
Now, is it possible to rotate in two perpendicular axes simultaneously? 
Around a specified point and axes. In other words, can I specified two 
different axes for VRX and VRY?
Thanks,
-Alain

Re: [Impact-users] How to impart rotational velocity using VRX VRY etc...

[Jens B. <jen...@gm...>]

Hi Alain

Have you tryed to look at this example in the folder:

/Impact/examples/3.in

I hope that helps!

Regards
JB

2008/7/7 Alain <J-A...@sy...>:

> Hello All,
> I am trying to give a constant rotational velocity to my model using the
> B.C. constraint VRX = 1  or any  of the "R" constraint parameter.  It
> does not matter if I  used a predefined AXIS or not,  I  never get any
> move from setting this parameter.
> What unit is used for this parameter anyway? Is it m/sec or
> radian/second? Is this the proper method to use? What else can I do to
> get what I want? Is it doable?
> Thanks,
> -Alain
>
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[Impact-users] How to impart rotational velocity using VRX VRY etc...

[Alain <J-A...@sy...>]

Hello All,
I am trying to give a constant rotational velocity to my model using the 
B.C. constraint VRX = 1  or any  of the "R" constraint parameter.  It 
does not matter if I  used a predefined AXIS or not,  I  never get any  
move from setting this parameter.
What unit is used for this parameter anyway? Is it m/sec or 
radian/second? Is this the proper method to use? What else can I do to 
get what I want? Is it doable?
Thanks,
-Alain

Re: [Impact-users] Running Impact in parallel

[Adam C P. IV <haz...@de...>]

Thanks, I'll look into it when I have time, and report back to the list.

-Adam

On Thu, 2008-06-05 at 18:55 +0200, Jens Bomholt wrote:

> Hi
> 
> You have to look in the source code. I haven't  figured out how to do
> that - but tried about one year ago.
> 
> Regards
> JB
> 
> 
> 2008/6/5 Adam C Powell IV <haz...@de...>:
> 
>         Thank you JB.  Very nice, the output shows it's running on two
>         CPUs, and "top" indicates its CPU usage is up to 200%.
>         
>         Most of my runs are without the GUI though.  How do I do it
>         from Impact.sh instead of from the GUI?  Where is the number
>         of CPUs set?  Is it on the java command line?
>         
>         I run these on a remote machine, so I ssh in, run (in tcsh):
>         
>                 Impact.sh [file].in >& [outputfile] &
>         
>         then log out, wait until it's done (a couple of days or more),
>         log in again, and run
>         
>                 ImpactGL.sh
>         
>         to view the results.
>         
>         How can I make the plain non-GUI Impact.sh run the job in
>         parallel?
>         
>         -Adam
>         
>         
>         
>         On Thu, 2008-06-05 at 18:17 +0200, Jens Bomholt wrote:
>         
>         > Hi Adam
>         > 
>         > You just have to move the slider like this picture.
>         > 
>         > Regards 
>         > JB
>         > 
>         > 2008/6/5 Adam C Powell IV <haz...@de...>:
>         > 
>         >         Greetings,
>         >         
>         >         I know that running Impact across a cluster requires
>         >         JavaParty, but
>         >         running across multiple CPUs in a single machine
>         >         should not, right?
>         >         Please forgive my Java ignorance, but how do I run a
>         >         multi-threaded Java
>         >         app like Impact across multiple threads/cores/CPUs?
>         >          I don't see this in
>         >         the Impact documentation.
>         >         
>         >         Thanks,
>         >         -Adam

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[Impact-users] Running Impact in parallel

[Adam C P. IV <haz...@de...>]

Greetings,

I know that running Impact across a cluster requires JavaParty, but
running across multiple CPUs in a single machine should not, right?
Please forgive my Java ignorance, but how do I run a multi-threaded Java
app like Impact across multiple threads/cores/CPUs?  I don't see this in
the Impact documentation.

Thanks,
-Adam
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Re: [Impact-users] Fill Solid

[jmb365 <jm...@br...>]

Hello Adam,

The Salome approach is what I am trying.  Of course Impact 0.7.5 now can 
directly read *.unv files so a translator is no longer needed. 

On a different topic, I have not found a clean way to translate the UNV 
files of Salome to *.inp files for Calculix (Abaqus format).  I recently 
downloaded the conversion program (unv2abaqus.py) available at 
www.caelinux.org, but it does not seem to work for tetrahedral 
elements.  Do you have any advice?  Maybe you could take a look at the 
code and tell me what I am doing wrong.  But then I do not know the node 
numbering sequence in a UNV file so I am "flying" (coding) somewhat 
blindly and guessing.  Thank you and sorry for intruding into your topic 
of conversation.

JMB

Adam C Powell IV wrote:
> On Sun, 2008-05-18 at 15:40 -0700, Brenda Ellen Make wrote:
>   
> You probably want to use gmsh, which has mesh generation capabilities
> and can link with Impact.  (I've never used it, I primarily use Salomé
> for that purpose, which in turn uses netgen.  But then I need to write
> my own little program to convert the Salomé mesh output formats to .in
> files.)
>
>   

Re: [Impact-users] Fill Solid

[Adam C P. IV <haz...@de...>]

On Sun, 2008-05-18 at 15:40 -0700, Brenda Ellen Make wrote:
> Hi,
> 
> Almost all 3D programs create hollow hulls. Even those that work with 
> "solids" do not.
> So, as far as exporting, very few programs have any ability to create a 
> 3D solid mesh.
> 
> Could some functionality be added to Impact to fill a hollow hull with 
> evenly spaced Tetahedrons, or Quadrahedrons, so it could be used with 
> Impact?

You probably want to use gmsh, which has mesh generation capabilities
and can link with Impact.  (I've never used it, I primarily use Salomé
for that purpose, which in turn uses netgen.  But then I need to write
my own little program to convert the Salomé mesh output formats to .in
files.)

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So Microsoft is sponsoring SourceForge now?  SF must really need money.

Cheers,
-Adam
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[Impact-users] Fill Solid

[Brenda E. M. <bre...@ya...>]

Hi,

Almost all 3D programs create hollow hulls. Even those that work with 
"solids" do not.
So, as far as exporting, very few programs have any ability to create a 
3D solid mesh.

Could some functionality be added to Impact to fill a hollow hull with 
evenly spaced Tetahedrons, or Quadrahedrons, so it could be used with 
Impact?

Thake Care,
BrendaEM