Hi,
I would like to know if there is any chance to simulate orthotropic nonlinear viscoelasticity/creep of CFRP in ANSYS (e.g. by means of user programmable features (UMAT subroutines) or using the software DIGIMAT or others)? For the nonlinear part I would like to use Schapery's method.
Many thanks for yor help!
-André
Does anyone know where can I find a manual and or tutorial for ANSYS 12.0 mechanical APDL , specifically where I can find something related to the use of viscoelastic material models???
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
NONEQUILIBRIUM THERMODYNAMICS OF DIELECTRIC ELASTOMERS
Xuanhe Zhao, Soo Jin Adrian Koh, Zhigang Suo
Constitutive relations, 2-D vs. 3-D. The starting point for modeling cellular membranes is the constitutive relations in 2-D space. It is important to set up the corresponding equations directly in two dimensions rather than to consider them as an asymptotic limit of three-dimensional relationships, like it is done in the shell theory. The main reason for the direct 2-D relations is that 3-D continuum approaches are not applicable to membranes whose thickness in on the order of magnitude of the dimension of a single molecule.
SUSHIL SINGH
Address: 417 Reed street
Tuscaloosa, AL 35401
Tel : (205) 239 1696 E-mail : singh.sushil [at] live.com (singh[dot]sushil[at]live[dot]com)
OBJECTIVE: Seeking opportunity as Postdoctoral Research Fellow/Structural Analysis Engineer.
SUMMARY:
Hi,
I am trying to model a sheet of Poly Vinyl Butryl (PVB), which is a viscoelastic material in ANSYS. I have all the regular properties like elastic, shear and bulk modulus, poisson ratio, denstiy and damping factor. I also have a stress- strain curve of PVB. With all this data, is it possible for me to find the various constants in the viscoelastic models using ANSYS?
Thanks
Saurabh
Dielectric elastomer, as an important category of electroactive polymers, is known to have viscoelastic properties that strongly affect its dynamic performance and limit its application. Very few models accounting for the effects of both electrostatics and viscoelasticity exist in the literature, and even fewer are capable of making reliable predictions under general loads and constraints. Based on the principals of nonequilibrium thermodynamics, this paper develops a field theory that fully couples the large inelastic deformations and electric fields in deformable dielectrics.
