Problem with exported Nastran code file

One another question, I have a solid mesh of the structure as attached. And I applied two 1000N of forces to two nodes when I was assigning the force. But when viewing it in 3D, I saw there were force vectors at each surface layer(see attached picture). So if there are 4 layers(5 surfaces), does it mean that the total force apply to the structure will be 5*2000N = 10000N or it is still 1000N? Thanks

<?xml version="1.0" encoding="UTF-8"?>

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Hi Steveivy,

We are looking into the Nastran export issue you are facing.

Regarding the applied load, yes it is 10000N which is applied on the model. Have you used box selection to select nodes when applying force?

instead, select the two nodes which you are interested in by manually clicking on the nodes.

Hi Steveivy,

 

We are looking into the Nastran export issue you are facing.

 

Regarding the applied load, yes it is 10000N which is applied on the model. Have you used box selection to select nodes when applying force?

 

instead, select the two nodes which you are interested in by manually clicking on the nodes.

I used 'select by window'. Or I can just divide the total magnitude by the number of layers and I will get the desired the total force.

Yes,

you can do that. Instead of layers, prefer divide total magnitude with total number of nodes.

say if the total load is 1000N and you want to distribute on 10 nodes, then on each node the load is 1000/10= 100N

Hi,

could you please let us know what is the version of HyperWorks installed on your machine and what are all the updates you have?

Please use the link below for information on how to check for updates:

http://forum.altairhyperworks.com/index.php?/topic/13435-to-identify-the-software-updatepatch-that-has-been-installed-in-your-machine/

I think the problem is with the co-incident nodes.

If you count the number of nodes you will see that there are 8 nodes in the model.

Try equivalencing the nodes. Goto Tool page>> Edges>> select component>> Preview Equivalence to see free nodes.

<?xml version="1.0" encoding="UTF-8"?>

Hi,

 

could you please let us know what is the version of HyperWorks installed on your machine and what are all the updates you have?

 

Please use the link below for information on how to check for updates:

 

http://forum.altairhyperworks.com/index.php?/topic/13435-to-identify-the-software-updatepatch-that-has-been-installed-in-your-machine/

 

 

Hi, 

I am using 11.0 version. The code I posted originally was generated from 8.0.  I will try your method when I get to school. 

I think the problem is with the co-incident nodes.

 

If you count the number of nodes you will see that there are 8 nodes in the model.

 

Try equivalencing the nodes. Goto Tool page>> Edges>> select component>> Preview Equivalence to see free nodes.

Hi,

I went to this point(see attached picture) and I don't know how to do next. I clicked preview equivalence but nothing going on.  Thanks

<?xml version="1.0" encoding="UTF-8"?>

Hi,

I went to this point(see attached picture) and I don't know how to do next. I clicked preview equivalence but nothing going on.  Thanks

just due to you create node IDs 1, 2, 3, 4 then nodes 5,6,7,8 concide to 1,2,3,4

so press Shift+F2 => clear all => will clear all free nodes 1,2,3,4 (because your CBEAM refer to nodes 5,6,7,8 so SPC and FORCE should refer to them too)

just due to you create node IDs 1, 2, 3, 4 then nodes 5,6,7,8 concide to 1,2,3,4

so press Shift+F2 => clear all => will clear all free nodes 1,2,3,4 (because your CBEAM refer to nodes 5,6,7,8 so SPC and FORCE should refer to them too)

Ok, I will try that. But I am just curious, I only create 4 nodes, how come there are 8 nodes IDs? 

Thanks

Hi Steveivy,

Please follow Tinh's suggestion.

if that doesn't work, you can use Tools page>> Edges>> slelect components/elements>> Equivalence.

if the problem still exists after doing this, you can replace nodes using Replace panel (F3 is the shortcut on your keyboard). Make sure you have activated coincidenct node picking in Options page (Press O on your keyboard>>Graphics>> coincident picking)

Ok, I will try that. But I am just curious, I only create 4 nodes, how come there are 8 nodes IDs? 

Thanks

perhaps you duplicated them, search if any '*duplicatemark nodes' command appeared in your \documents\command.cmf file

Hi Steveivy,

 

Please follow Tinh's suggestion.

 

if that doesn't work, you can use Tools page>> Edges>> slelect components/elements>> Equivalence.

 

if the problem still exists after doing this, you can replace nodes using Replace panel (F3 is the shortcut on your keyboard). Make sure you have activated coincidenct node picking in Options page (Press O on your keyboard>>Graphics>> coincident picking)

perhaps you duplicated them, search if any '*duplicatemark nodes' command appeared in your \documents\command.cmf file

tinh

It works. Thank you guys

So in the future, will it be a good practice that clear all the free nodes before applying forces and constrains? And is there an easy way to tell that I have free nodes in the model?

Yes Steveivy, free nodes appear in form of 'yellow balls' and you can easily see them

And you should activate 'concide picking' as Pagadala's suggestion to avoid wrong selection