×
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

Cohesive elements in Abaqus 6.13 - Fracture mechanics

Cohesive elements in Abaqus 6.13 - Fracture mechanics

Cohesive elements in Abaqus 6.13 - Fracture mechanics

(OP)
Hi Guys!

I'm trying to model the contact between 2 surfaces using a cohesive layer with a traction-separation law.
I want to use a bi-linear constitutive behaviour, like the one reported in the image I attached; that bi-linear diagram is completely known to me. The behaviuor is the same in every direction (isotropic behaviour).

The program asks me to insert the following values to define the behaviour of the cohesive layer:

E/Enn

G1/Ess

G2/Ett

(or Knn, Kss and Ktt in the previous versions of Abaqus).

If I'm not wrong, E, G1 and G2 are the energies of fracture in the 3 directions of deformations, and I can determine them because they represent the area under the bi-linear curve (the area in grey in the image I attached).

Enn, Ess and Ett are the "elastic" stiffnesses of the cohesive element, and I can determine them because they represent the slope of the first branch of my bi-linear diagram.

The 1st question is: am I wrong? Can I use this method to insert that numerical values in Abaqus?

Moreover, to define the damaging behaviuor of the cohesive material, I'm asked to insert the subsequent quantities:

Nominal stress, Normal-Only mode

Nominal stress, First direction

Nominal stress, Second direction


I don't know what they are.

Thank you very much for your help!

Orlando



RE: Cohesive elements in Abaqus 6.13 - Fracture mechanics

Does anyone knows the answer on this question?

I have the same doubts!

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