SN Curves 1

[pulsetech]

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

 

[stanier]

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The field of fracture mechanics has superseded the use of SN curves in the analysis of failure mechanisms of thermoplastics so I am a little confused by the approach you are taking.

 

[Maui]

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

 

[TVP]

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

 

[pulsetech]

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.