Dear All,

 I am a Masters Student in Material Science, I am supposed to do the Finite

Element modeling of PTFE material with few content of short carbon fibers. Could any of you please suggest the best,

 1.Modeling method, its

2.Material parameters and 

3.References of that best modeling method.

Would be really thankful and would be helpful for my studies as well. 

Regards,

Raghu Raman Rajagopal

Denmark. 

Is it possible to find eigenvalues and principal directions for a 4th order tensor? How?

For a zero order tensor? for a first order tensor? for a third order tensor.........

many thanks

Hello Abaqus Users,

I am new to Abaqus: I am trying to model formation and propagation of fractures in glacial ice (note: ice deformation mainly by plastic flow). I was wondering if anyone has modeled ice as a material exhibiting a nonlinear behavior, or possibly have a user subroutine for ice that I could use. Thanks in advance for any help.

Daniel

i'm a new persone in this webside

i'de like to know more good things about Gurson model.

if u have any help

so , u can add me between ur friends

yacult273@hotmail.fr

thx for ur help  

Hello everyone,

 I am having trouble applying cyclic loading in ANSYS with a frequency of 2 Hz while comparing the stress levels of interface elements at my crack interface. After I apply the first loading cycle I post process the result compare the stress values of the elements and proceed to the second cycle, while I do that once I post process the results the time step at the start of the second load cycle starts from time 0 again which is affecting my load increment Vs time, to get around this problem I applied a dummy load until it reaches the time step of the previous cycle and then proceeded with applying actual loads. 

Hello:

 My name is Eric and I am working on my MS thesis project.  I have been tasked with analyzing a reinforced concrete column specimen in Abaqus and comparing the analysis results with the experimental measurements.  The column is subjected to cyclic lateral loading. 

My question is how we can predict the crack growth rate and direction for a structure under cyclic loading in such a way that both plasticity and creep has been built in it.

Let's say we have a simple beam that has gone through a number of thermo mechanical cycles. The cycle, for simplicity, is composed of two points. The first point has high mechanical and thermal loading, say, 2000F. Another point has no mechanical loading, and the beam is under uniform room temperature.  Often we see cracks initiated in the beam. My goal is to predict the crack growth rate and direction as the number of above defined cycles builds up.

I've mostly had quite helpful responses from iMechanica participants whenever I've asked questions on this forum.  However, I've noticed that questions from several posters have gone unanswered.  I feel that there are two main reasons for that lack of response:

1) The questioner has not provided an adequate details by which they can be identified.  I generally don't like responding to a question posed by someone called xyz1983. 

2) The question itself is vague or too general to be answered in anything short of a book length discussion. An example may be "I want to do FEM on RF-EMW.  Can someone help?" 

Hello

        I am looking to get some pointers on manual meshing using ANSYS workbench. I am not happy with the automesh results I am getting. I would like to discuss one on one via email. I am a real user and not a spammer. Anyone willing to discuss?

Thanks

              Mani