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applying constraints in 3D mesh

Altair Forum User

dear all,

i have meshed a model with tetraelements and i want to constrain a structure at 3 top points where i want to have a pin joint.. i have created it as follows i created a rbe2 in the hole surface and at mid node i have applied constraint.. i.e i want to have a rotation along Y-axis here so i have constrained all five dof except 5.. and i am attaching my HM file with this kindly let me know whether what i have done is right or wrong? if it is wrong kindly let me know what is the right way to do it..

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

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Rahul Rajan_21763

Under constraint panel DOF 1-3 is for translation & 4-6 is for Rotation. So if uncheck DOF 5 that means your are allowing your model to rotate along z axis.

Altair Forum User

5 is rotation along y axis right?

Altair Forum User

and as i heard 3D elements will not be having Rotational DOF i.e 4,5 and 6.. is it so?

Rahul Rajan_21763

Hey sorry..that was typo from my side. DOF 5 means rotation around y axis.

Rahul Rajan_21763

PFA on 3d element no rotation.

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

Altair Forum User

thanks for ur response sir.. but how can i create a pin joint on top? i need to have a rotation for the retraction of LG

Rahul Rajan_21763

Hi Nithish,

I believe you have raised this topic of Pin joint on top earlier.It would be nice if you can come on chat room to discuss more on your work.