×
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

Plotting stress-strain curve for rubber

Plotting stress-strain curve for rubber

Plotting stress-strain curve for rubber

(OP)
Hi All,

I'd like to plot stress-strain (stretch) curves to compare different rubber materials (I have Mooney or Ogden constant already).

For Mooney-Rivlin material, I can calculate stress S as
 S=(2C1+2C2/d)(d-1/d^2)

where C1 and C2 are Constants and d is the stretch ratio, defined as the ratio of the stretched length to the initial length of the sample. This can be defined in terms of the measured strain in a simple tensile test
d=e+1. .

For Ogden material there is other formula:
S=Sum(mn(d^(bn-1)-d^(-1(1+0.5bn)))

where m and b are Constants, and index n - order of Ogden model (it's all about a simple tension).

For Mooney and Ogden n=2 it works: I try it with different C1 and C2 , and m and b data from literature and it's OK. But for n=3 it doesn't work. Does anyone know how to do it for such case? Thanks

Regards,
Mike

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