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Stress-induced phase transformation and pseudo-elastic/pseudo-plastic recovery in intermetallic Ni–Al nanowires

Submitted by Vijay Kumar Sutrakar on

Dear friends,

I want to share our recent research work on NiAl nanowire, which is published in Nanotechnology, IOP publishing. The abstract of the paper is given below. Further details can be found at "Vijay Kumar Sutrakar et al 2009 Nanotechnology 20 295705 (9pp)   doi: 10.1088/0957-4484/20/29/295705"

 

Modelling Impact on ANSYS-AUTODYN OR ANSYS-LS-DYNA

Submitted by sherifmshaaban on

I have one very simple question regarding ANSYS-AUTODYN and LS-DYNA. It seems that both can model impact loads.



My
questions is which can model low-velocity impacts and which can model
high-velocity impacts. I have some troubles modelling low-velocity
impacts in autodyn (changing the mass of the projectile does not affect
the pressure and the stresses on the target. Does this mean autodyn
only models high-velocity impacts)

Large deformation and electrochemistry of polyelectrolyte gels

Submitted by Wei Hong on

Immersed in an ionic solution, a network of polyelectrolyte polymers imbibes the solution and swells, resulting in a polyelectrolyte gel. The swelling is reversible, and is regulated by ionic concentrations, mechanical forces, and electric potentials. This paper develops a field theory to couple large deformation and electrochemistry. A specific material model is described, including the effects of stretching the network, mixing the polymers with the solvent and ions, and polarizing the gel.

Deduction of derivatives of free-energy density function in ABAQUS UHYPER

Submitted by Lianhua Ma on
Dear xuanhe and all,
I have reviewed the paper "Method to analyze programmable deformation of dielectric elastomer layers". (Xuanhe zhao, Zhigang Suo)
It is very insteresting.
I have one question you would like to ask you.  Hope to get your reply.

Periodic Boundary Conditions for uniaxial compression

Submitted by Gouse on

Dear All,

I am trying to simulate mechanical behaviour of a concrete unit cell for uniaxial compression laoding. I have apllied periodic bounadary conditions on both lateral edges using linear equation option available in ABAQUS where as on top and bottom edges load is apllied. Deformed structure shows there is no lateral deformation and unit cell behaves as if it is confined laterally on both sides. I am confused about my boundary conditions whether they are correct or not. 

 Equation used to aplly periodic bounadary condition are

Mohr-Coulomb Shell in Abaqus. Help!

Submitted by pbocchini on
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Hi,

I am new to Abaqus and I am trying to use it to model some industrial shells. According to some preliminar studies, the material has a mohr-coulomb plastic behaviour. Thus, I wanted to use shell elements, with a mohr-coulomb plastic material, but it seems that it is not possible in Abaqus.

According to the theoretical manual and the user manual (18.3.3-6):