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!

*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.

Jobs

Fibers compression performance, which parameters?

Fibers compression performance, which parameters?

(OP)
Dear all,
Dyneema fibers has a poor performance in compression, even worse than aramid fibers; yet they present a very high tensile strength.

My question is: which the parameters determine the compressive performance of a polymer?.

I think it might be related with the presence of a stiff backbone chain (containing lots of aromatic rings, for instance) and probably the amount of secondary bonding (namely hydrogen bonding), but I am not quite sure about this.
Thanks in advance.

João Freitas

RE: Fibers compression performance, which parameters?

The reasons are quite simple. Tensile strength comes from a high degree of alignment of the polymer molecules, which have a very high aspect ratio as fibers do on a macro scale. This alignment is created by doing a lot of stretching of fibers during the manufacturing process. Breaking highly oriented fibers requires breaking chemical bonds in the backbone of the molecules rather than the weaker bonds holding different molecules together. Tensile loads increase orientation and strength.

Compression loading causes fibers and molecules disorient and to buckle. You cannot push with a piece of string.

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


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