×
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

Threaded Rod Tensile Testing

Threaded Rod Tensile Testing

Threaded Rod Tensile Testing

(OP)
I want to do a standard tensile test on a A36 threaded rod (1"-8 threads). I was planning on threading large steel plates to the top and bottom of the rod so that the tensile tester can clamp onto these plates for easier mounting. Is there a way to calculate the minimum thread engagement length needed to ensure that the rod is not stripped out of the threads before the rod breaks? A36 steel has a tensile strength between 58 and 80 ksi.

RE: Threaded Rod Tensile Testing

1 1/2 D usually works

Regards,

Mike

RE: Threaded Rod Tensile Testing

(OP)
Awesome thanks. If the max tensile strength of A36 is 80ksi, how do I calculate the maximum load that a 7/8"-9 rod could theoretically take?

RE: Threaded Rod Tensile Testing

By referring to Machinery's Handbook, which covers the subject pretty extensively. Failing that there is always Sigma = P/A.

Regards,

Mike

RE: Threaded Rod Tensile Testing

Remember, the "area"above in his formula is for the root area (not the max diameter area) of your 3/4 rod.

Further, you buying an "average" (or maybe a cheap Chinese imitation!) of an "average" A36 piece of steel. What is its actual strength? Are you sure you really know the baseline strength of what you "think" "should be" 36,000 psi?

At this level of calculation - you also need to actually measure the diameter and actual thread depth. Don't "assume" your book values are correct.

RE: Threaded Rod Tensile Testing

Should break before you reach ~37,000 lb.

"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein

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