×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Boltpreload and displacement in contact

Boltpreload and displacement in contact

Boltpreload and displacement in contact

(OP)
Hello all,

Im working on a way to simulate a bolt contact with the sol101. For sol 601 I don’t have the license. In most cases its working for my problems well. But found a problem if I use friction to stop movement. I can see a small displacement in my connection. To check this I build this small model. Bolt preload is on a beam, which is connected by RB2 to the soild. The solids are connected by a linear connect:

Checked:
- node constraints on rot
- different rigids (rot)
- different boltfacts,
- and some more

Picture of the model:



Picture of the results (only bolt preload and with load):




my model if some want to try:

http://h2107735.stratoserver.net/protte/FEM/PB.mod...

may some have a clue how to fix it and make a stable connection.


RE: Boltpreload and displacement in contact

Sol 101 will simply weld the contact regions, that is my understanding.. Because you are using RBE2, any displacement of the independent node of the RBE2 connecting the beam element node at the top of the shank to the head will move the head by the same amount. The deformation you are seeing may simply be elastic glued deformation magnified.

www.stressebook.com
Stressing Stresslessly!

RE: Boltpreload and displacement in contact

(OP)
The sol101 has two different types of connection. Linear connection and glued. I used the first one. The second one has no traction on the contact region. But you bring me on another idea. To get the preload of 10KN we have to deform our beam about 0,012mm (dl=F*l/(EA)). My deformation in independent node is :

CODE

Node 10419
  Output Set        8 : BP ONLY 10kn
        Value =        0.036456  |  Output Vector        1 : Total Translation
        Value =        0.011525  |  Output Vector        2 : T1 Translation
        Value =         0.02153  |  Output Vector        3 : T2 Translation
        Value =        0.027068  |  Output Vector        4 : T3 Translation
  Output Set        9 : BP ONLY 20KN
        Value =        0.075214  |  Output Vector        1 : Total Translation
        Value =         0.02305  |  Output Vector        2 : T1 Translation
        Value =         0.04319  |  Output Vector        3 : T2 Translation
        Value =          0.0571  |  Output Vector        4 : T3 Translation 

we see total deformation is 3*T1. T1 is the axial vector of my bolt. But if i set a friction in my connection. there should be no traction in my connection.

RE: Boltpreload and displacement in contact

Hello!,
The link to donwload the FEMAP model is not valid, something is wrong, please check.
Best regards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog de FEMAP & NX Nastran: http://iberisa.wordpress.com/

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources