research

viscoelasticity  ----ABAQUS

Dear Guys,

I AM NEW PHD STUDENT and my project is to build a finite eleminte model based on MRI data of an index finger and the tissue inside it.  I'm wondering how to start it and what is the best way to go about it.  I've not covered all the aspects of my project or the first step to start it.  I'm looking for some advice regarding this.

Thanks for your reply

hi

please wgo can tell me what does mean the folowings:

   -", the modulus ratio in the first term in the Prony series expansion of the shear relaxation modulus."

   -", the modulus ratio in the first term in the Prony series expansion of the bulk relaxation modulus."

and how to calculate them in abaqus

thanks 

Hello,

 Am working on post tension prestressed concrete with Abaqus,

1-  I would like to know where to find the "initial conditions option and prestress hold" in which module??

2- Rebar option: as per the Help, it is mentioned that i can define a rebar as individual element not as rebar layer in a shell/membrane element. but also couldn't be able to find how and in which module?

Any suggestions?

Wating for a quick feedback

thanks

Dear All



I am working on Abaqus simulation for thermo-visco-plasticity, especially on necking problem in circular bar.

I need the plastic strain data to add in the material properties table of Abaqus.

And, any help in this regard would be appreciated.



Thanks

Shabeer Khan

MSc Computational Mechanics

I'm trying to plot the stress-strain curve described by the Johnson-Cook strength (and eventually damage) models. The strength model is defined as:

σ=[A+Bεⁿ][1+C ln(ε_dot*)][1-T*^m]

where A, B, C, n, and m are material constants, ε_dot* is the non-dimensionalized strain rate, and T* is the homologous temperature where T*=(T-T0)/(Tmelt-T0)

Dear all,

           I would like to ask you something about prof.
Huang's subroutine. I want to verify the code, by using published
stress-strain data. But when I am plotting my stress -strain curve I am
always getting a straight line instead of a curve that shows the hardening effect. What could be a reason for this problem?

         Regards,

         Panos

p.s. I am using a single crystal, single element, and only modify the crystal orientation