iMechanica - Crack Length in Cohesive Element (ABAQUS vr 6.7.1) in pure MODE I case - Comments

hello , only i commit an

mouna — Tue, 06 May 2008 10:51:53 -0400

hello ,

only i commit an error, i said i can't signed a section=i can't assigned a section

thank you

finite element modeling

mouna — Tue, 06 May 2008 10:49:46 -0400

hello,

Please could any person help me, i search to model an adhesively bonded lap joint using ABAQUS 2D : i use cohesive section for the adhesive the cohesive with continuum response, and i use beam truss section for adherent in this step i have problem i can't signed a section. In interaction module i use tie constraint with the adherent master and the adhesive slave.

this is my adress email haouasmouna@yahoo.fr, when you can send me some articels who can hepl me

thank you for all

bye

Abaqus error

Ayman Ibrahim — Wed, 30 Apr 2008 19:37:49 -0400

Ayman

Hi all

Please could any one help me to solve the messeage error, every time to run the Abaqus to simulate CPT in sand i got that message (The elements in element set ErrElemZeroALEMass-Step1 have zero or negative mass.

The elements contained in element set ErrElemExcessDistortion-Step1 have distorted excessively.

Abaqus/Explicit Analysis exited with an error - Please see the status file for possible error messages if the file exists.)

Please help me?

Ayman

define path

Masayuki Wakamatsu — Wed, 23 Apr 2008 22:00:25 -0400

Hello Yujie,

Thank you for taking time to provide me a good suggestion. I tried to take a path (nodes) along cohesive elements, but ABAQUS does not allow to do so on the torn (eliminated) elements. Instead, I took a path (nodes) on Master element side, I still need to spend some time to process data.

I hope there will be a commend that would simply tell us the crack (torn element) length. Anyway, thanks again.

Masa

Pore water pressure effect

Ayman Ibrahim — Wed, 23 Apr 2008 21:00:25 -0400

Hi Sir(s)

I am a new user for ABAQUS and looking for D-P model and i do need to simulate saturated sand to study the liquefaction phenomenon. So can any body tell me how i can use D-P model to simulate pore water pressure.

Thanks

define node or element path along the interface

Yujie Wei — Wed, 23 Apr 2008 10:38:27 -0400

If you define a node or element path along the interface in Abaqus viewer, you can plot the stress or displacement along the path at different time and save them as ASCII files. Whith such information, you should be able to determine where is the crack tip at different time. No extra effort is needed in the input file in this case.

Alternative, you can write properties of cohesive elements by adding a command like "*Element Output, FILE ....." to do the same thing. I can not remember the exact definition but it is easy to find in Abaqus manual.

Crack Length in Cohesive Element (ABAQUS vr 6.7.1) in pure MODE I case

Masayuki Wakamatsu — Tue, 22 Apr 2008 23:51:56 -0400

Help! imechanica!

This might not be a smart question to ask, but if any of you can help me, it'd be great.

I have a DCB (sandwitch specimen) with a cohesive element in the middle. Studying pure Mode I case, displacement is applied at the end of the DCB. Cohesive element works great (it fails when one reaches max separations). But I am having a difficulity in extracting crack length (i.e. length of failed cohesive element) vs time step. I looked for Damage and Status commend, but it's not promising. (I'm pretty new to ABAQUS....)

If you have worked on cohesive elements, and know where those (filed maybe?) output of failed element lengths can be found, could you please help?

Thanks~ masa