Fracture Mechanics Forum

Hi there

pleas help me with an example explaining how to use matlab code in determining crack growth rate

thank you

hello dears

i have a problem with abaqus in defining material constant for damage initation and evolution(c1,c2,c3,c4)

i dont know the equation that they depend. can somebody help me?

thanks a lot...

Hello,

I wondered if there are any users of FRANC2D/FRANC3D.  If yes, I would appreciate if anyone have examples of solving transient crack propagation problem for a reinforced concrete structure (preferably with interacting cracks).

Your help is much appreciated. 

Thank you,

ss

dear all,

i wanted some codes used in ABAQUS to solve the dynamic problems:

1.Blunt and Hemispherical projectiles hitting the plates.

2.When the plate is perforated by the high velocity projectiles.

hope someone will help me.

regards,

-Sanjay

I am trying to simulate a punching process in abaqus but cannot get the model to work correctly.  When the punch hits the blank, it tries to deform the area and then aborts the analysis.  How can I get the mesh to break becuase of the shear stress rather than just deforming?

I am trying to read J integrals and K Factors from an Abaqus history output database, but I'm however getting a KeyError for 'setname=_PickedSet24' which is the nodeset generated from abaqus cae for the cracktip node. The problem is symetric CCT model using abaqus V6.8.2.  In addition, as the script aborts at this point, I'm not quite sure how it will respond to variables 'J' or 'K' for J-integral and stress intensity factors respectively.

I am quite new to script writing and hope someone could share their expertise. Find my attempt below.

Hi,

        I want to model 3D crack propagation in Abaqus Explicit. For this I am thinking of using the *shear failure option with element deletion. The path of the crackin my models is not known. I have some basic questions in this regard.

1. Is *shear failure a good approach to model crack propagation ?

2. I am modeling crack growth in geological materials. Usually cracks propagate in the trail of a damage zone. Can this (damage zone) be reproduced in Abaqus Explicit with *shear failure option ? 

Thanks in Advance,

 My problem is the following: I have a bounded domain \Om in a plane, and I am looking for the fundamental solution

div_y C \nabla N (x,y) = \delta_x,    in \Om

where C is the elasticity tensor (anisotropic),  with natural Neumann boundary conditions on \partial \Om (traction free).

 I don't ask for explicit solutions! I would like to know that 

  \nabla N(x-y) \le C/|x-y|, where C is a constant depending on whatever!

Hello,

I am expected to calculate strain energy release rate for a single lap composite joint using VCCT in ABAQUS.How do I go about it?

The manual saya some thing about debonding? How do i do that in my model?

Thanks,

Srilatha

Hi everybody,

I'm looking for some resources (textbooks,webpages,papers)  to give me some insights into stress analysis and fracture mechanics of functionally graded materials. i appreciate any suggestions.

Thanks.

Hi

I have a working DCB model with embedded cohesive elements. This is done in Abaqus/CAE standard using nonlinear analysis.

However I'm having trouble finding an efficient way of measuring the distance of failed cohesive elements from the load(displacement) line for evey time increment in abaqus. Its possible to do this manually using the 'Query information' tool for every single time increment but for a model with more than 100 frames this method is not very good. 

Greetings to all Imechanicans ! ,

I just started using the scripting interface in Abaqus, and i stumbled into a small issue, I have a sample input file which is a small model for crack simulation and its UEL subroutine, I know how to open the input file  but I don't know how to open the UEL subroutine that goes with it, I get the following error :

The model "projGH" has been created.

Hello everyone,

 I'm doing a 3D modelingcorroded pipe.  The results is differant from the Analytical solution (modified N31G mathod).  Abaqus results is actualy half of the analytical solution.

I need some help whith:

1-  Half of the pipe was modeld so, how should i constrain the pipe? I constrained it as in the attached picture.

2- How can i know how much load was applyed?

3- how can i magnifiy teh displacment?

Thank you,

Badr

Hi,

 Can anyone discuss about, how can we simulate  tool wear on coated/uncoated cutting tools in orthogonal turning using Abaqus. Any suggestions/links would greatly appreciated.

 Thanks and Regards,

Hari Goud

I am a student and I need to simulate compact tension test so as to obtain the fracture toughness using ABAQUS. I would have to compare the fracture toughness value from ABAQUS with values obtained from experiment.

I have been trying to model the compact tension test for weeks without sucess. Can anyone give me the step by step description of how to model the compact tension test

Thank you 

1、Chaboche J L. Une loi diferentielle d’ endommagement de fatigue avec cumulation non linearire.Revue Francaise de Mecanique,1974, 50-51

2、Lemaitre J, Plumtree A. Application of damage concepts to predict creep-fatigue failures. Journal of engineering materials and technology. Transactions of ASME. 1979,101:284-292

Hello,

I have been reading up a lot  on "crack propagation" and "cohesive elements" in Abaqus. But i am still struggling to make it run and frankly i am running out of time. I have got only two more days to get the model running for a kind of "Introducing modern science to the public" exposition... I am trying to simulate crack propagation in rubber material in the case of uniaxial tension.

I recall the problem that i want to simulate: