User login

You are here

Comments

Subscribe to Comments feed
Comments
Updated: 23 hours 5 min ago

Hi,

Sun, 2017-05-28 16:43

In reply to ABAQUS-cohesive elements in compression

Hi,

For this case, you've gotta differentiate the bahaviour of cohesive element in tension and compression separately, you can write a subroutine.

For instance, if you consider a big value for stiffness without damage in compression for cohesive elements, you will see that two elements never go inside each other. Overall, all is about the definition of cohesive property for cohesive elements. Just in case, keep it in mind that considering a big value for stiffness means considering rigid body condition for cohesive element that may generate stress concentration, you must check to make sure to get what you exactly want.

Regards,

Mehdi Shahzamanian 

this paper gives yet another simple interpretation

Sun, 2017-05-28 08:25

In reply to On Pastewka and Robbins' Criterion for Macroscopic Adhesion of Rough Surfaces

 

This recent paper shows a yet more radical view on PR results, where the conclusion is just the opposite: slopes and curvatures have no role at all on stickiness!

A very simple estimate of adhesion of hard solids with rough surfaces based on a bearing area model

Thank you for interesting announcement

Fri, 2017-05-26 07:03

In reply to Turn your computer codes into Apps connected to HPC in the Cloud

Dear Wenbin Yu
I'm looking for something like that. Recently I'm working with ANSYS and ABAQUS scripting and looking for a platform that can execute scripts without the need of a cumbersome program installed in users' computer.
Could you tell me more about your platform? Is it something like cloud computing? Does it need a computing server where many cae programs take job from users? 

Best regards, 
Nhan

Yes that is true

Wed, 2017-05-24 21:46

In reply to Input variables used in Abaqus UMAT: STRAN, STRESS and DSTRAN

If you find it confusing use the large displacemnts by turing NLGEOM = yes in input file and then use the deformation gradient

DFGRD1 and calculate the finite strain E= (F'F-1)/2.0 and then calculate the stress. if you so it this way you will find that in finite strains or large displacements the strain (STRAN) is the log strain and without any rigid rotations and the stress calculated is cauchy stress.

I hope this clears your doubts.  I also noticed this in the starting but after this small exercise things became clear.

Abaqus2Matlab website

Sat, 2017-05-20 14:47

In reply to how to link abaqus with matlab ?

The Abaqus2Matlab toolbox has now an official website:

www.abaqus2matlab.com

One can find there the latest version, as well as various useful tutorials and examples on how to use it.

 

hello professor ludovic am

Sat, 2017-05-20 04:39

In reply to PhD position in development of cracking computational models in high entropy alloys

hello professor ludovic am verry interested to work in this phd project 

hello professor ludovic am

Sat, 2017-05-20 04:37

In reply to PhD positions in multi-scale computational mechanics

hello professor ludovic am verry interested to work in this phd project 

Dear Dr. Hatami, 

Fri, 2017-05-19 14:17

In reply to Postdoc position in soft tissue mechanics

Dear Dr. Hatami, 

My name is Piyush Gaur. I am currently pursuing my phd in the field of soft tissue biomechanics from IIT delhi, India. I have a relevant research experience in the field of experimental characterisation of soft tissues, i.e. uniaxial tensile and biaxial tensile testing. I will submit my thesis in Nov 2017. I am interested in pursuing the research in experimental characteristion of biological materials and microstructural modelling. 

 

Regards, 

Piyush 

 

load condition at critical location

Sun, 2017-05-14 21:03

In reply to How to pass the plastic strain components to ABAQUS subroutines?

I am not sure how are you gonna to calculate the Effective from the principle plastic strain component, as this is what already Abaqus do in my opinion.

My understanding is that the effective Plastic strain is considered the other strain components, in another word, is more efficient if you have multiaxial load than uniaxial at the point of interest. 

 

Process induced residual stress in composite.

Sat, 2017-05-13 11:11

In reply to How do I run Abaqus 6.7-1 from a DOS Window

When I run subroutine ***.for, I got this error message "Error in job case1temp: Problem during compilation - D:\Important\****\****.for". How can I fix it.

Node set will work if...

Fri, 2017-05-12 08:21

In reply to How to model 1/4 part of 3D cubic void cell (RVE) in abaqus which is subjected to combined tension and shear ?

 

 

Finally its working in my case, 

Obviously Node to Node Equation constrains is another option if someone knows python.

But incase someone doesn't know pyhton then this could be the other way to go forward,

Node set will work subject to condition that the node set should be formed using paired nodes (Pairing of nodes can be done using a simple MATLAB code). Also while writing the input file UNSORTED option must be activated to force the ABAQUS to apply equation constraints on the nodes in sequential order (the order in which you have formed the nodal set. 

For example, 

*Nset, nset=Surface-Bottom-Right, instance=Part-1-1, unsorted

 

 

Regards,

Vishal

something about this phenomenon

Fri, 2017-05-12 05:52

In reply to A question about anisotropic plastic

I have god some clue about the strain hardening anisotropy. It is a phenomenon which is hard to simulate. See the work:

Effect of texture and microstructure on strain hardening anisotropy for aluminum deformed in uniaxial tension and simple shear.A novel approach for anisotropic hardening modeling. Part II: Anisotropic hardening in proportional and non-proportional loadings, application to initially isotropic material

I have god some clue about

Fri, 2017-05-12 05:51

In reply to A question about anisotropic plastic

I have god some clue about the strain hardening anisotropy. It is a phenomenon which is hard to simulate. See the work:

Effect of texture and microstructure on strain hardening anisotropy for aluminum deformed in uniaxial tension and simple shear.A novel approach for anisotropic hardening modeling. Part II: Anisotropic hardening in proportional and non-proportional loadings, application to initially isotropic material

Thank you

Thu, 2017-05-11 21:58

In reply to Congratulations for starting your group, David!

Dear Sung Hoon,

Thank you for your kind message.

Best,

David

Congratulations for starting your group, David!

Thu, 2017-05-11 16:36

In reply to Ph.D. position in Mechanical Engineering at Villanova University

Dear David,

Wonderful to hear that you will start as a faculty this Fall. 
Congratulations!

I send my best wishes for your next steps.

stricking paper!

Thu, 2017-05-11 00:48

In reply to Symplectic analysis for wrinkles: a case study of layered neo-Hookean structures

stricking paper! congratulations!

Hi Farzad

Wed, 2017-05-10 08:34

In reply to Dear Johannes , your work

I agree with you about the Nummerical modul import error. I met this error too. Delete it and run again.

Hi Johannes. Thank you so

Wed, 2017-05-10 08:27

In reply to Abaqus Script Manual/Tutorial

Hi Johannes. Thank you so much. You did a great job.

I'm new to ABAQUS scripting, so your sample code helps me a lot. 

As far as I am concerned, there are two methods of scripting which are writing job file (.inp) and writing journal code (.py)

Let's call the former job-method and the later journal-method. I think each method has their own advantage and difficulty. 

  • journal-method uses python language to create commands for every manipulation that users conduct in ABAQUS GUI. We can learn from the journal file (.jnl) to convert complex GUI based manipulation into code.
  • job-method use ABAQUS syntax to write input file. That means the users have to write down the mesh, nodal coordinate... by their own. It's not easy and take efforts. 

I have just tried scripting for one day so I just make a snap judgment. It may be wrong. Could you give me your opinion about the advantage and difficulty of the two methods? Which one is better? In addition, could you give me some good reference for ANSYS-Matlab connection and ANSYS scripting?  

Best regards,

Nhan

Thank you very much

Wed, 2017-05-10 08:21

In reply to Abaqus Script Manual/Tutorial

<p>Hi Johannes. Thank you so much. You did a great job.<\p> <p>I'm new to ABAQUS scripting, so your sample code helps me a lot. </p><p>As far as I am concerned, there are two methods of scripting which are writing job file (.inp) and writing journal code (.py)Let's call the former job-method and the later journal-method. I think each method has their own advantage and difficulty.</p> 

  • journal-method uses python language to create commands for every manipulation that users conduct in ABAQUS GUI. We can learn from the journal file (.jnl) to convert complex GUI based manipulation into code.
  • job-method use ABAQUS syntax to write input file. That means the users have to write down the mesh, nodal coordinate... by their own. It's not easy and take efforts. 

 <p>I have just tried scripting for one day so I just make a snap judgment. It may be wrong. Could you give me your opinion about the advantage and difficulty of the two methods? Which one is better? In addition, could you give me some good reference for ANSYS-Matlab connection and ANSYS scripting? </p>  <p>Best regards,</p> <p>Nhan</p>

Ya node set will not work

Sun, 2017-05-07 16:39

In reply to How to model 1/4 part of 3D cubic void cell (RVE) in abaqus which is subjected to combined tension and shear ?

I think node set would not work. you have to go from node to node.

It is better to use to python script with find the corresponding nodes at the edges and surfaces and then use the equation constraint to apply the boundary conditions.

If you are trying it for the first time then you may contact me again and send me the input file.

I would also recommend you to try CUBIT software which is more useful in generating the input file for abaqus.

All the best.

Pages

Recent comments

More comments

Syndicate

Subscribe to Syndicate