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

Internal friction in steel wire rope

Internal friction in steel wire rope

Internal friction in steel wire rope

Hi folks, I had a class about friction while winding wire rope around a drum. I'll translate (it's in portuguese) and transcript a text about it:

A rope just can wind up around a drum when it takes the drum's shape due to it internal friction appears and it leads a deviation (it can be estimated, see the image 1) between the rope axis and an axis tangent to drum and parallel to the rope axis (Image 2). The main reasons which lead the internal friction are:

1. The compression of rope fiber next to the drum and tension of rope fiber furthest from the pulley

2. Sliding friction between the rope fibers

3. Elastic deformation of the material.

And this friction can be put into numbers by this formula (Image 3) and the amount of force required to wind up it by this another (Image 4). Given this introduction, my question is do you guys know something or meet this theory? I asked it because I was not able to find anything article about it. I think it is important to make you know the author of the book has passed away for more than one decade so the theory can be outdated.

RE: Internal friction in steel wire rope

It's based on practical experience, by measurement with a lot of different cable/rope sizes and lay patterns. It would be awfully difficult to model the internal friction in a rope from first principles.

RE: Internal friction in steel wire rope

the internal friction is the result of the relative movement of the strands against each other when the cable is moved over a pulley or a drum. it will also depend on the way the cable is constructed - some designs might be better then others. another influence on the friction is the type of lubricant. during manufacturing the cables are impregnated with a lubricant that reduces the friction and wear when relative movement of the strands occurs and also acts as a anti-corrosion agent. i have no idea though how the influence of the lubricant can be quantified.

RE: Internal friction in steel wire rope

you should get something from here: Link

this too: Link

See the attachment also.

RE: Internal friction in steel wire rope

It's seems like DTIC servers are currently off line.

And now they are back.

RE: Internal friction in steel wire rope

Thank you all of you, sirs. I could download the three of us navy wire rope handbook. I’lol upload it to my google drive then I’ll share a link for those who couldn’t download it.

RE: Internal friction in steel wire rope

Volume 1Link

Volume 2

Volume 3

RE: Internal friction in steel wire rope

Tiger Brands Wire rope engineering handbook Link

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