×
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

Does chassis rigidity diminish over time / age ?

Does chassis rigidity diminish over time / age ?

Does chassis rigidity diminish over time / age ?

(OP)
Especially torsional rigidity?

Cheers.

RE: Does chassis rigidity diminish over time / age ?

Sure; rivets loosen, welds crack, corrosion reduces section moduli, etc.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Does chassis rigidity diminish over time / age ?

Get enough rust build up and you could get the Southern Rigidity factor... ha-ha...

Cabbages, knickers, It hasn't got A BEAK!

RE: Does chassis rigidity diminish over time / age ?

I don't know about y'alls, but mine has been pretty much downhill lately...

Rod

RE: Does chassis rigidity diminish over time / age ?

(OP)
How about a car in the absence of extreme abuse nor rust?

Do spot welds weaken over time from "normal" use?
 

RE: Does chassis rigidity diminish over time / age ?

No.
 

Mike Halloran
Pembroke Pines, FL, USA

RE: Does chassis rigidity diminish over time / age ?

(OP)
So some cars do break welds or sheetmetal - the BMW "clown shoe" Z3 coupe rear shock towers comes to mind.

For cars that don't outright break stuff, do spot welds degrade or microcrack or fatigue or something, over time, from age and normal use?


 

RE: Does chassis rigidity diminish over time / age ?

I will amend my earlier answer.  Spot welds do have a finite fatigue life.  Which means that after some finite time, even if never subjected to abnormal stresses, they will break.  The finite time is normally longer than the car is expected to last, and far longer than its warranty.

"Normal use" does not include resurrecting a frame or car from a junkyard or chicken coop and putting it back in service.


What are you actually trying to learn here?

 

Mike Halloran
Pembroke Pines, FL, USA

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