×
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

SN Curves

SN Curves

SN Curves

(OP)
Hey all,

I am new to this group and look forward to being an active member.

We are currently running an fatigue FEA analysis which we need the SN curve for a particular material (thermoplastic). The vendor of the material dont have this data (SN curve). Is there any source you know of that may list SN curves of similar thermoplastics materials?

Thanks in advance.

Best Regards,

Ken
Pulse Designtech

RE: SN Curves

What thermoplastic material are you looking at? The plastics industry hasnt been terribly good at providing the data.

Some references are

Applied Stresss Analysis of Plastics Krishnamachari Failure of Materials in Mechanical Design by Collins
or Deformation and Fracture Mechanics of Engineering Materials Hertzberg.

The field of fracture mechanics has superseded the use of SN curves in the analysis of failure mechanisms of thermoplastics so I am a little confused by the approach you are taking.

RE: SN Curves

Check out the following link:

http://www.dow.com/styron/design/guide/fatigue.htm

They show a typical SN curve for the type of material that you are interested in. If you contact this supplier, they may be able to provide you with the data that you need.

Maui

RE: SN Curves

pulsetech,

The best source of fatigue data on thermoplastics is either directly from the resin supplier, or the following reference:

Fatigue and Tribological Properties of Plastics and Elastomers by: Plastics Design Library Staff © 1995 William Andrew Publishing/Plastics Design Library

You can obtain this reference by using the following link:

http://www.williamandrew.com/books.asp?id=88420715

RE: SN Curves

(OP)
I would like to thank everyone for the great information on my request.

Stanier - Thanks for the info on the Fracture Mechanics direction for the Thermoplastics I will ask our team to look into this for future analysis projects. We were looking for the SN Curves as the input in using Cosmos Works for this particular analysis.

Maui / TVP - Thanks again for the links.



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