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

ISO20332 guidance

ISO20332 guidance

ISO20332 guidance

I'm seeking guidance on ISO20332, Specifically, parts relating to fatigue assessment. The parameter 'm' is related to the relationship between stress and load cycles. Clause 6.2.3 permits using m=3 for a simplified assessment, however, most of the example cases in Table D.1 are for m=5. It seems that m=5 is the more conservative approach, but it's too conservative in my case. What is the intended workflow for selecting and applying the value of 'm'?

EDIT: Furthermore, the formula: ΔσRd = Δσc/ (γmf x (sm)^(1/m)) (eq 39) yields a value HIGHER than the material yield stress for many (most?) value combinations (e.g. Δσc=160, γmf = 1.25, m=3 or 5, sm=0.032. Which doesn't makes sense in the case of non-reversing loads.

RE: ISO20332 guidance

What is the application?
What is the material?
What are the regulatory requirements?

RE: ISO20332 guidance

I'm not quite sure how to answer that one. ISO20332 is fairly specific, so it's somewhat self-explanatory. In any case, the application is a crane application (in my case, a static winch), the material is mild carbon steel, and the regulatory requirement is to comply with ISO20332.

I hope that helps clarify my enquiry.

RE: ISO20332 guidance

Ok, thanks. I’m not familiar with that ISO and am not going to purchase it.

Seems like selection of m would depend on the criticality / redundancy of the part and consequences of failure. Also would depend on whether there are other conservatisms in the fatigue loads calculation.

RE: ISO20332 guidance

Hi, thanks for taking the time to respond, but without a knowledge of the specific standard, any answer is a guess and isn't helpful.

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


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