×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

excessive stress after bolt pre-load step in abaqus simulation

excessive stress after bolt pre-load step in abaqus simulation

excessive stress after bolt pre-load step in abaqus simulation

(OP)
hi to all
 We are try'n to make a thermal analyze aprox. 15 cm long heavy exhaust
 Manifold head and part of engine block where the part is attached.
 Problem that we encountered recently is excessive preload at the bolt neck.
 In the model we have pre-load at the middle section and bolt is tied to engine block from below and there is a contact between the
 bolt head and exhaust manifold.
 Our questions are;
 1 ) what is the possible  reason of having 3000 MPA stress value ( is it that important value to care that much )
 just for preload step with a preload value of 41600 kN for M10 bolt?
 2 ) just for a trial we add a test load as a pressure from the turbo section that causes bending over the bolts for any pressure value, and our contacts in the model do not converge.
 So, solver does not go through the load step after bolt load step .
 
 Although we have tried to change master and slave surface definitions and tried different type of contacts for our contact regions, unfortunately we did not get a satisfactory result yet.
 
 Contact definition still seem to be a problem for 6.7 version of abaqus but anyway may be one of the most difficult part of simulation for all CAE programs.
 Thanks for you replies.
 Write you soon.

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close