Jorgen
Administrator

Hi Jorgen,

Im doing the analysis for finding the extrusion of PTFE seal (5%)G.F.Could you suggest the best materisl model for carrying out the analysis.

I have seen the experiemental datas for PTFE 15% G.F in this forum.Do you have any experimental datas for unfilled Teflon ?

Hi
Dr
I am doing Impact simulation on carbon epoxy 16 ply and using hashin damage model but I defined my material as lamina my problem here is weather I have to define my material in vumat or can i do on lamina

Hi Jorgen,

I want to integrate matlab and abaqus to solve an optimization problem which needs a no. of iterations. I want to run this in batch mode. . Can you please give me some direction on this. I am new to both matlab and abaqus. Thanks.

Hi Jorgen,
I am writing a Umat for a micromechanical model of 'Deformation induced anisotropic mullins effect' in Abaqus...Now the jacobian matrix DDSDDE(NTENS,NTENS) for this constitutive model has to be written as prescribed in the user manuals.... How can I derive the Jacobian Matrix...Need your help urgently please..
Thank you.

Hi Jorgen,
I am working on the implementation of Mullins effect by using UMULLINS user defined subroutine in Abaqus...I am doing so because I want to use a new damage function in constitutive model...Do you have any experience in writing UMULLINS..If so then can you please guide me with it..
Thank you.

Dear Dr Jorgen

I am so grateful.
thank you very much

I have sent two private messeges for you

please read these messages

Dear Dr Jorgen

happy new year

I have sent an e-mail for you

please help me

hi Dr Jorgen

if you please, how can i get the (drucker and prager constitutive model) in fortran code which, implemented (built in) in ABAQUS FINITE ELEMENT code. I need this model to modify it for modeling a soft soil in braced excavation application with small strain stiffness application (importing young's modulus as a function of strain and changing the stiffness after yielding occur)

Dear Dr. Jorgen,

I found this thread http://polymerfem.com/forums/showthread.php?t=833 with indentation input file for Abaqus. I model similar things in Adina and have problems for large strain case, therefore before finishing PhD thesis in couple of months, i would like to quickly try Abaqus.

I thought to use input file from mentioned above thread, but it contains more than 20 000 nodes and therefore I can't run it on our license.

Could you be so kind and give me couple of hints how to make similar (orphan) mesh from scratch or maybe a link to some resource.
All I find in internet (tutorials) are much more simple in terms of meshing. HTML documentation is not that useful either - i have not found step-by-step examples for that kind of meshing.

Thank you in advance,
Best regards,
Denis Davydov,
PhD student, Czech Technical University

dear Jorgen,

Hi, I would like to check the constraint effect on the hydrogel filler (circle) in another hydrogel matrix (rectangular block). The estimated elastic modulus is around 5kPa. Unfortunately, it does not work in ABAQUS/standard. Then I run it in ABAQUS / explicit. Although the simulation complete successfully, but the result doesn ot look correct. The interesting bit is that if I change the materials properties to steel & Al it works well.

Could you please give me some advice on this ?

I am eager to your kindest help !

The input desity is 1100.

Great thanks in advance !

Sorry, I do not know how to attach the images. It seems that I need URL to attach the figs. Could you please tell me how to do this so that I can send you the images ?

Thanks !!!!

vicky