iMechanica - ABAQUS Cohesive Elements - Comments

Traction-separation law

Sergej Tarasov — Sun, 27 Jul 2008 08:07:22 -0400

From my experience, the shape of traction-separation curve has little effect on the load-displacement curve for linear materials. The initial stiffness of the cohesive elements should affect the slope of the first part of load-displacement curve, and the "sharpness" of the peak load value depends on the strength (maximal traction) of the elements. As the crack propagates all curves should practically coincide, as we see in Case 3. But results for Case 1 look quite strange.

Excellent work

yanyabin — Sat, 26 Jul 2008 10:00:23 -0400

You have done an excellent work!

Here what I want to say is that I am also working on using cohesive elements to simulate the delamination process in pizeoelectric thin films. Layers in this kind of thin films are in micrometer or even nanometer scale. What's more, my simulation is also based on a sandwiched-cantilever experiment.

In my simulation, some different kinds of cohesive zone models are used and their traction-separation laws are programmed in the user subroutine in ABAQUS. By reading your paper attached in your blog, I know that the bilinear cohesive zone model was used in your simulation. So, did you applly other kinds of cohesive zone models in your simulation? Did you code their constitutive relations in the user subroutine?

Therefore, I am very interested in communicating with you about the cohesive zone models. Do you have spare time to have this kind of communication with me?

PS: My e-mail: yanyabin@gmail.com.

regards

yanyabin

term paper uploaded

Masayuki Wakamatsu — Fri, 09 May 2008 14:42:43 -0400

imechanicians & Dr. Huang,

Please find the attached EM 388F term paper.

If anyone is struggling to have cohesive element to work, please feel free to contact me.

I couldn't have made numerical analysis without generous support from fellow phd. student.

regards,

masa

Good work

Rui Huang — Fri, 09 May 2008 14:10:26 -0400

It is interesting to see how the shape of traction-separation curve affects the load-displacement response as well as the crack growth behavior.

Presentation File Updated

Masayuki Wakamatsu — Wed, 30 Apr 2008 18:38:05 -0400

imechanicians,

Please find the attached presentation file.

masa