×
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

Problem with Cohesive Elements

Problem with Cohesive Elements

Problem with Cohesive Elements

(OP)
Hi,
I am having some trouble with the cohesive elements... I am using the cohesive elements to simulate the crack growth on an aluminium thin panel using 3D elements. I have a crack in the middle of the panel meshed with 0.2 mm cohesive elements that must not be damaged under the load that I am applying. I do not know how to define the response of the cohesive elements using a traction-separation law. What should I put n the E/Knn, G1/Kss, G2/ktt fields?

Also when I try to simulate the response of the panel it acts as if the cohesive elements were not carrying load, for example, my panel has a height of 300 mm and the cohesive zone covers 200 mm with a initial crack on the middle, but the panel responses as a panels with a 200 mm crack while the cohesive elements just "follow" the deformation of the mesh without carrying load, but the do not suffer any degradation. Indeed the Status parameters has a value of 1.0 and the initiation criterion is not met.

Thank you very much

RE: Problem with Cohesive Elements

G11 & G22 are the fracture toughness of the interface. E is the modulus when closed, typically a value like 1x10^9 is used. Try that & see if it solves the second problem.

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