Pbush ,RBE2 elements

Altair Forum User

Hello All,

Can we define Pbush property with RBE2 element of is it only defined for CBUSH (spring) element.

 

Regards

Pratik

Altair Forum User

Hi Pratik,

 

what is the use case?

 

Do you want to make the spring as a rigid using PBUSH property?

 

if that was the case, you can use RIGID in PBUSH card.

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

Rahul_P1

Pbush is specific to Cbush, RBE 2 will not accommodate properties of any kind. 

Altair Forum User

but i was just able to use Pbush propety (Rigid) for my RBE2 element...

tinh

Altair Forum User said:

but i was just able to use Pbush propety (Rigid) for my RBE2 element...

Hi, it sounds great

Could you share your bulk data please? I wanna know how you did it

Altair Forum User

@tinh

i first defined RBE2 element by 1D>rigids...

Then Model Broser> create Property> Pbush> Define Property

Then Model browser > component> Property> Pbush.

 

Bulk Data

 

$ RBE2 Elements - Multiple dependent nodes
$
RBE2      132102   38009  123456    6871    6872    6874    6877    6883
+           6892    6913    6916    6921    6931    6932    6938    6940
+           6951    6960    6968   26057   26058   26059   26061   26063
+          26064   26065   26066   26067   26068   26070   26071   26072
+          26073   26074   26075   32110   32111
RBE2      132103   38010  123456    6865    6866    6886    6895    6915
+           6927    6929    6930    6935    6936    6937    6944    6956
+           6957    6958    6959    6963   25373   25375   25377   25379
+          25380   25381   25383   25384   25385   25386   25387   25388
+          25389   25390   25392   25393   25394   25395   25396   32112
+          32113   32114   32115   32116   32117   32118   32119   32120
+          32121   32122
RBE2      132104   38011  123456    7040    7042    7057    7058    7064
+           7070    7072    7073    7074    7076    7079    7081    7083
+           7085    7086    7087   25610   25612   25614   25615   25616
+          25617   25618   25619   25620   25621   25622   25623   25624
+          25625   32222   32223   32224   32225   32226   32227   32228
+       
RBE2      132105   38012  123456    7093    7098    7103    7104    7111
+           7113    7114    7120    7125    7132    7136    7137    7138
+           7139    7140    7141    7142   25843   25845   25848   25849
+          25850   25851   25852   25853   25855   25856   25858   25859
+          25860   25861   25862   25863   25864   32102   32103   32104
+          32105   32106   32107   32108   32109

 

 

$HMMOVE       22
$         132102THRU      132105
$     

 

 

$$  PBUSH Data
$$
$HMNAME PROP                   1'pbush' 2
$HWCOLOR PROP                  1       4
PBUSH          1       KRIGID   RIGID   RIGID   RIGID   RIGID   RIGID   
$$

tinh

Hi Pratik, in your bulk data RBE2 has no data field referring to PBUSH #1

so actually the PBUSH is not linked to RBE2

in hypermesh you can assign property to a RBE2 component but output bulk data of RBE2 have only ID, Inode, Dofs, Dnodes

Altair Forum User

Pratik,

 

what is the reason to give a PBUSH property to RIGID elements?

 

A rigid element like RBE2 will be rigid all DoFs and RBE2 doesn't carry a PID as Tinh said.

Altair Forum User

Altair Forum User said:

Hi Pratik, in your bulk data RBE2 has no data field referring to PBUSH #1

so actually the PBUSH is not linked to RBE2

in hypermesh you can assign property to a RBE2 component but output bulk data of RBE2 have only ID, Inode, Dofs, Dnodes

 

Do you mean removing Pbush property will have no effect . Also then using Spring element with C Bush property with dof set to zero will better way to modell structutre fixed to rigid support

tinh

Altair Forum User said:

Do you mean removing Pbush property will have no effect . Also then using Spring element with C Bush property with dof set to zero will better way to modell structutre fixed to rigid support

 

Yes you can remove the PBUSH, the better way to model structure fixed to rigid support is to create RBE2 at nodes of structure and apply SPC for one of nodes of the RBE2. SPC is rigid support