contact between bolt and nut on abaqus 2

[giuse]

Hello everyone,
I`m a new abaqus user. I`m trying to define the contact between bolt and nut.
I`m using Abaqus 6.11 (CAE) and after importing, meshing, adding step ecc, i`m in struggle with the contact interaction.
Any advice?
As results i need the pressure and the deformation on the threads.
Thanks in advance

 

[portliner]

It sounds as your model contains the local geometry of the threads. If so, you should positioning the bolt and nut correctly in the assembly. Then defining *Contact Pair between the threads bolt/nut. Defining *Contact Pair between the flat surface of the nut and corresponding contact surface of the surrounding structure. Fixing the opposite end of the bolt or corresponding. STEP 1: apply a given angular rotation to the nut. Check the resulting required torque to achive this angular rot. The anuglar rotation is applied indirectly to the nut via a RIGID POINT ( 6 DOF) and defining a Constraint between the RIGIG POINT and the upper surface of the nut. The angular rotation is applied to the RIGID POINT.

 

[lattedicocco]

Portliner, it seems that you have already perfomed a similar calculation: do you have any model to share?

 

[portliner]

Good morning, unfourtnally I dont have a model. I couls eventuall build one, I will check that.

 

[giuse]

Hello, thanks for your reply. how can i define a rigid point? Is it different to a reference point?
Also, I meshed the parts with TET control,is that right?
find attached the link to download the files, so that is easier understand the problem.

http://rapidshare.com/files/3266529727/bolt and nut 30may.cae

http://rapidshare.com/files/1135660096/bolt and nut 30may.jnl

 

[portliner]

Hi, I mean rference point, not rigid point. I dont have ABAQUS on my private laptop, will see if I may open your CAE at my work.

 

[giuse]

http://rapidshare.com/files/1588515330/bolt and nut 30may.cae

http://rapidshare.com/files/2347803929/bolt and nut 30may.jnl