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

Welding - Determine Unit Second Moment of Area (Iu)

Welding - Determine Unit Second Moment of Area (Iu)

Welding - Determine Unit Second Moment of Area (Iu)

Hello All,

I am working through some weld calculations and have a profile which is not covered in the standard "treat a weld as a line tables" for bending and torsion.

I am looking for the governing theory to determine the Unit Second Moment of Area (Iu)[Shiggley's notation] for bending is determined. I have a feeling this is pretty straight forward but I can't find any information, only the pre-calculated tables.

RE: Welding - Determine Unit Second Moment of Area (Iu)

If you post up a sketch of your weld geometry and loading condition, I'm sure that with all of the knowledge on this forum we can get you an applicable theory and the design codes to back it up.

RE: Welding - Determine Unit Second Moment of Area (Iu)

Well at the end of the line you can always use basic mechanics to determine things like that

RE: Welding - Determine Unit Second Moment of Area (Iu)

cogmaster, I believe you would calculate the cross sectional properties for the line of weld the way you would for any shape, but use a unit value of 1 for the width of the weld. This will give you an inertia with units mm4/mm that will then give you a section modulus in units of mm3/mm, and when divided by your bending moment will give you a shear on your weld in units of kN/mm. I suggest using this method to calculate Iu for some of the shapes that have tabulated values and then compare your answer to the table.

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


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