×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

*
*
*
*

Thanks. We have received your request and will respond promptly.

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

Stress concentration

thread404-494271

Stress concentration

Stress concentration

(OP)
Hi,

I have a case here where i would like to know what the stress concentration factor conservatively (see below). I have heard that if you set 3 then you are safe?


RE: Stress concentration

Yes, I have heard that too ....

MJCronin
Sr. Process Engineer

RE: Stress concentration

It depends on the loading.
If this is fatigue it would be worse than that.
But for low cycle and static loads 3 is usually in the right range.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Stress concentration

(OP)
Thx for the replies. What would considered to be low cycles in this case?

RE: Stress concentration

what does welding do the material properties ?

we're assuming zero voids, even little tiny ones ?

"surely" someone has done some research on the fatigue of welds ??

another day in paradise, or is paradise one day closer ?

RE: Stress concentration

Yes it depends on a lot of factors.
You have to make a bunch of assumptions; ductile materials, properties largely unchanged by welding, weld filler modestly stronger than base metal, loads a small fraction of ultimate, no high cycle fatigue, and so on.
Of course a lot of this goes away if they just use a full pen weld

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Stress concentration

Slightly different perspective. IMO the weld, in practical, is full pen weld since root of 1mm will get melt. Then the stress concentration will not be of big concern since the weld is/going to become full pen.

RE: Stress concentration

(OP)
Just for the diskussion asume it is not fully pen.

Lets say 14k cycles what would a conservative factor of stress concentration be?

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