×
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.

Students Click Here

Strain energy

Strain energy

Strain energy

(OP)
Hello everybody,

I have a deformated shell with a certain strain energy and a certain disposition of stress. Since is simmetric respect to both axis I model just a quarter of a plate putting th symmetry on the other part of it.
To simulate  a crack I release some elements in the simmetry line in order to get them free. In this case the strain energy should be the same? if so why the free elements simulating the crack change the stress towards 0 while the other doesn't change at all?
I'm asking if there is some way to to fix the strain energy in order to have even the other stress redistribuited.

thanks,
Albert

RE: Strain energy

If the crack propagates the new portions of the crack faces (resulted through node release) should be traction free if the material is elastic. If the material deforms plastically then there'll be a "plastic wake" and the stresses will not go to zero but rather to some residual values.

The strain energy is a history quantity and you can alter it only by modifying the state of stress or elastic strain in the body.

RE: Strain energy

(OP)
xerf,

I have an elastic material so the traction free is correctly 0 but do you know why the other stresses are not influenced by imposing a crack? I think that the stress distribution will change not only on the crack introduced but also in the rest of the plate.
And how can I change the state of stress or elastic strain in a shell once I already have a state of stress on it?

thanks,
Albert

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! Already a Member? Login


Resources

eBook - Functional Prototyping Using Metal 3D Printing
Functional prototypes are a key step in product development – they give engineers a chance to test new ideas and designs while also revealing how the product will stand up to real-world use. And when it comes to functional prototypes, 3D printing is rewriting the rules of what’s possible. Download Now

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