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

What brings the exploration of the failure modes of foam core sandwich?

What brings the exploration of the failure modes of foam core sandwich?

What brings the exploration of the failure modes of foam core sandwich?

(OP)

Hi Guys!

What brings the exploration of the failure modes of foam core sandwich?
what can you learn from it?

Thank you

RE: What brings the exploration of the failure modes of foam core sandwich?

When you overstress a sandwich , very often the first failure is the delamination of the skin facing, followed by a buckling of the side of the face in compression, the other failure is deformation of the foam again allowing the compression side to buckle into it. There are other failure modes like peeling.
You explore and investigate these all failure modes to see how closely you can load your structure, or even to see if you are using the best foam for the job.
B.E.

You are judged not by what you know, but by what you can do.

RE: What brings the exploration of the failure modes of foam core sandwich?

NASA CR 1457 analysis of sandwich panels.
Skin wrinkling is often most critical. You also have honeycomb (and very coarse foam) skin dimpling and also core shear failure with both skins in compression (shear crimping). Note the two types of skin wrinkling with honeycomb and foam core. Skin wrinkling occurs with the lower of core compression or core tension or core/skin bond tension. Core compression is often lower than core tension with hot wet foam core (but always check foam tension which will have a low skin-bond tension compared with honeycomb). Lessons to be learned? Check and avoid all local stability failures as well as overall panel stability. Note that foam has lower specific strengths than honeycomb so foam will always make a slightly heavier structure.

RE: What brings the exploration of the failure modes of foam core sandwich?

(OP)
Berkshire, thank you for your helpful information

PRstress ,thank you for your detailed explanation. I'm reading that literature

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