×
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

4-point bend fatigue tests for steels

4-point bend fatigue tests for steels

4-point bend fatigue tests for steels

(OP)
Hi,

I am designing a 4-point fatigue test (R+) bending jig for unnotched and rectangle steel specimens. The specimen's width and height will be approximately 40x30 mm. The loading and support spans are going to be fixed (non-adjustable).

What aspects should I take into account in jig design and determining specimen's support and loading spans? The maximum normal stress (between loading rollers) and shear stress (between loading and support roller) can be calculated by using beam theory and trying different loading forces, but are there any other stresses I should know?
How can I determine the right diameter for the loading rollers? I understand that the rollers should be free to rotate because of frictional effects. Does the jig's loading and support system need to be articulating or is a rigid system adequate, so that the loads are evenly applied to the test specimen?

Any comments or experiences?

RE: 4-point bend fatigue tests for steels

Buy a fixture.  The rods have to align exactly.  It isn't worth the trouble to build.

= = = = = = = = = = = = = = = = = = = =
Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net

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