×
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

poisson ratio polyurethane moldings

poisson ratio polyurethane moldings

poisson ratio polyurethane moldings

(OP)
Anyone know what poisson ratio value range I should be using for FEA purposes?  Cannot find on efunda, etc.

mil-m-24041c

Thanks

RE: poisson ratio polyurethane moldings

Have you tried the raw material manufacturer. They should be the best source grade specific data.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
 

RE: poisson ratio polyurethane moldings


Due to the creep behaviour of plastics, stress is heavily dependent on strain rate, so a value for Poisson's ratio is generally not specified. If you look at a typical plastic data sheet, you should see that some parameters are actually specified at a defined strain rate (e.g elongation before break is usually at 50mm/s - sometimes other rates are given.

As Pat suggested, talk to the material supplier and they should be able to help.

Cheers


Harry

RE: poisson ratio polyurethane moldings

(OP)
I tried talking to the material manufacturer, but the part that I am analyzing was made in the early-mid 80's and the company is unable to locate and provide the material data sheets.  

I understand the creep-rate effects for a constant load, but for a one-time impulse-loading situation it seems there should be a poisson's rtion value applicable for polyurethane.

RE: poisson ratio polyurethane moldings

It will probably be called an apparent Poison Ratio. That's what they do with e mod which is also prone to creep.

Bayer Materials or Lenxis or whatever they call themselves now should have data on a similar grade. 20 years ago they literally published truck loads of technical data.

They invented PU and were always considered the market leader re technical service.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
 

RE: poisson ratio polyurethane moldings

(OP)
Do you have a website or phone # for Lenxis?  

Thanks,

RE: poisson ratio polyurethane moldings

Was the "whatever they call themselves now" a clue.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
 

RE: poisson ratio polyurethane moldings

That's Lanxess, used to be Bayer.

There is not any memory with less satisfaction than the memory of some temptation we resisted.
- James Branch Cabell

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