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I am using Abaqus/cae 6.7 right now. Strain energy potential is marlow. I do not have any stress vs. strain data for compression(from experiment), and I do not know the behavior of the material under compression. obviously, it is implemented in the model that way. Thanks for this valuable...

what you are saying is totally right. Obviously, the change in response is caused by a difference in deformation mechanism btw tension and compression. Actually, I could understand it if it was from experiment. What I do not understand is how simulation generates this.

It is a fluoropolymer. Red line is under tension Blue one is under compression In order to make it easy, I put compression into the first quarter of the coordinate system.http://files.engineering.com/getfile.aspx?folder=56ad2fb5-c25f-4041-b66a-9fb66143a5ba&file=comp.JPG

Depending on how much you compress, you can get such a result.

Hi, I am trying to simulate a plastic with a hyperelastic model. Input: Uniaxial test data Output 1: stress-strain curve under tension Output 2: stress-strain curve under compression When I compare these two curves, I have different behavior. does anyone know what can be the cause of this...

rb1957: Red-lined region. Over there, for instance, there is a X symmetry. I am wondering how I can write it in words?

Hello I have a unit cell(cube 15*15*15mm). I have symmetrical b.conditions for this cell as can be seen from figure. I would like to write this boundary conditions into my report. But I am not sure how to write it. For that surface, I have XSYMM boundary conditions. I am wondering how if I can...

I would say that is an engineering approach, and it worked quite well. Thank you very much. I did it like this!

IRStuff: The problem is I do not know how to do it. That was why I was asking. Could you please tell me how to do it? It is really important for me. clindeman: I am entering Stress and Strain(experiment) data into simulation. I am taking simulation data. So comparison is something that you...

clindeman: Thanks for your answer, but what do you mean by saying same conditions? IRStuff: Thanks for your answer, Unfortunately it is not possible. Then I should also put the corresponding values MechEng2005: Thanks for your answer. I have a curve, I am attaching it again in 97 format. I...

Dear all, Could you please tell me how I can compare two curves in excel? I have a master curve from experiment data, I would like to compare this master curve with the one that I get from simulation?

Hi I think it is about your installation. Is there a perl.exe file in the pointed location? If not, you can try to reinstall it.

Ok, I think I solved the problem. When I use Marlow Strain Energy Potential, I should put two zeros at the beginning of nominal strain-stress data. Now it looks fine. Also I changed the time step, made it only 1 seconds, and every 0.05 seconds I receive data. Thank you very much.

I checked materials parameters and stability limit information. I can not choose a different material model since it is hyperelastic material. Regarding the strain energy potentials, I can only choose Marlow since I have only one test data. Abaqus documentation does not suggest to use other...

williwang: I did not smooth the data. Do you mean changing the curve data since at one point stress starts to decrease while strain is still increasing so it does not work? Stupplebeen: Yes, that is the problem. Data is not appropriate since it has a decrease in stress. It is not increasing...

Hi, Thank you very much for your reply. Nonlinear Geometry is: On The problem is with the uniaxial test data. Please find the attached file.http://files.engineering.com/getfile.aspx?folder=a73485cc-e2d7-42f4-8715-6a67713fa0a8&file=new_data.cae

Hello there, Currently I am trying to simulate a hyperelastic material. I have uniaxial test data from experiment. When I implement this data to Abaqus/CAE 6.7-1, and run the simulation, I have a problem since the stress and strain do not increase continously. Simulation is aborted. Could you...

Dear Friends, Thank you very much for your all helpful posts. It is a little bit late I know. Unfortunately, I was ill... Regarding experiment data, I could not find any way to CORRECTLY determine averaged values. However, I draw 8 x-y scatter chart. and then I took the average of all data, and...

Hello my friend. Recently I have Force vs. Displacement data for my polymer. I did 8 experient. I have 8 different data sets like(just an example): Table1 Table2 x y x y 1 22 1.2 24 2 29 2.6 29 3 33 3.3 24 4 34 3.8 21 I...

The closes result that I could get it this one. By putting a reference point on the edge of right surface, and then constrain it to the whole surface. Now there is another problem with the meshes. File http://rapidshare.com/files/207857746/3d_al_b.zip.html