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Manoj Krishna Majumder's picture

Abaqus Help

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Wei Hong's picture

Modeling Viscoelastic Dielectrics

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.

Material modelling of steel in cyclic behaviour - Abaqus

Hi friends,

I am studying about cyclic behaviour  of steel-concrete composite column. When i am giving material properties of steel, i have doubt  about Isotrophic Hardening and Kinematic Hardening, which one i have to use to get cyclic behaviour of column.

 Thank You

R.Velmurugan

How to perform surface boundary integration in elasticity fem?

This is a basic question regard to elsticity fem.

How to compute traction boundary integration numerically in elasticity fem under general situation? That is:

\int_{\Gamma} [N][t] d\Gamma,   here [N] is shape function and [t] is surface traction

 My E-mail: shengxu.xia@yahoo.com

Thanks a lot

Convergence problem in 2-d axisymmetric elasto-plastic formulation

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Dear all,

I am trying to solve the thermal ratcheting of a hollow cylinder using elasto-plastic formulation.

I am applying the moving thermal gradient in axial direction. Our FEM code(Newton Raphson) is converging for first increment but after that it is diverging. I have used 8 noded serendipity element with 9 gauss point.

Sequence loads

Hi everybody

 I want to ask you regarding the general pattern of diagram da/dn Vs. DeltaK(stress intensity factor) for Variable amplitude loading? Could we share our knowleadge in this case?

Regards,

 

thermo-mechanical coupling analysis of brake disc

Pls i am new to Ansys just learning how to use it for my research project on composite brake disc. pls can someone help with the following;

1. procedure for thermo-mechanical analysis

2. setting boundary conditions

3. meshing application

i will be very glad if i can get this informations it will really go along way in assisting me for my reseach work. debisi1@yahoo.com

 thank youvery much

Generating quadratic tetrahedral (tet10) meshes from .stl surface models

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Hi iMechanica-experts,

I'm working with soft tissue models of abdominal organs (e.g. liver) for surgery simulation. These models are alway constructed from segmented surface files (triangles, e.g. .stl). I'm devloping an algorithm that uses isometric quadratic tetrahedral (tet10) elements (mainly in order to reduce volume locking). Now I'd like to generate a tet10 mesh from the surface mesh.

Nima-Farhadi's picture

link abaqus-matlab

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hello,

how can i link abaqus and matlab together?

thanks

Shuozhi Xu's picture

A molecular dynamics study of void interaction in copper

We recently posted a work on void interaction in copper using molecular dynamic simulation:

A molecular dynamics study of void interaction in copper

http://dx.doi.org/10.1088/1757-899X/10/1/012175

Abstract

houti's picture

file data to UDEC and 3DEC for masonry behavior

 

 

I am student in doctorate and I’m working on the experimental and numerical behavior of brick wall masonry and i am utilising UDEC and 3DEC code i have some problem to establish the file data for this code, if you can help me and transmit this file dada please

 

 

PBC in ABAQUS

Hello everybody, i am new in abaqus, is anyone who knows how to apply periodic boundary conditions, for example for unit cell. The piece of code would be very much appreciated

 

for example ´

if i have on the left hand side node set NSET1, on the right hand site NSET2 than i should use equation like this for periodic boundary conditions in x-direction?

*EQUATION

NSET1, 1,1, NSET2, 1, 1????

Please help 

Best regards

ABAgirl

Periodic Boundary Conditions in ABAQUS

Hello everybody, i am new in abaqus, is anyone who knows how to apply periodic boundary conditions, for example for unit cell. The piece of code would be very much appreciated

 

for example ´

if i have on the left hand side node set NSET1, on the right hand site NSET2 than i should use equation like this for periodic boundary conditions in x-direction?

*EQUATION

NSET1, 1,1, NSET2, 1, 1????

Please help 

Best regards

ABAgirl

BoJing Zhu's picture

Ludwig Boltzmann: the man who trusted atom(Chinese version)

One of the book may help us understand why Boltzmann can have so many new ideas (atom theory, statics mechanics and so on)

 

 

how element quality will affect the accuracy of results

hi all,

I want to know how the element quality is decided.

For example: for warpage of elment if allowable limit is max 15deg, what will happen if it exceeds 30 deg.

On what basis this limit is calculated.

Like this for the other quality parameters also.

plz help

 

sagar

Li Han's picture

Stiffening of organosilicate glasses by organic cross-linking

Atomistic simulations show that organosilicates, used as low-permittivity dielectric materials in advanced integrated circuits, can be made substantially stiffer than amorphous silica, while maintaining a lower mass density. The enhanced stiffness is achieved by incorporating organic cross-links to replace bridging oxygen atoms in the silica network. To elucidate the mechanism responsible for the enhanced stiffness, the conformational changes in the network upon hydrostatic and shear loading are examined.

Good substitute for cowper-symonds in Abaqus

Hi all,        I want to capture strain-rate behaviour of materials but unfortunately abaqus does not have Cowper-Symonds which is a widely used (simple) model. However johnson-cook is to complicate for me as not much details are available in literature as i am modeling bio-materials. Is there any good substitute for Cowper-Symonds models in abaqus. Thanks.

Can nonlinear buckling analysis gives us an over estimate ?

I am working on thermal buckling of annular FGM plates using the DQ method in FORTRAN. The results show that for simply-simply edges, the nonlinear thermal buckling loads are greater than those of eigen buckling loads. But for clamped-clamped edges, as it may be expected, the nonlinear buckling loads are under estimate, i.e. they are lower than eigen buckling loads.Why?

Is it possible that the nonlinear buckling analysis gives us an over estimate load ?

Material Parameter Calibration for Johnson Cook

Hi all ... Is there a way to find/calibrate material parameters for johnson and cook material model using experimental data in Abaqus? .. As far as i know abaqus has something called as data editor with which Hyperelastic materials models can be calibrated with experimental results. If not is there any other way arround to do calibration of material parameter with abaqus.

Geometric nonlinearity

hi all,

How to decide the geometric nonlinearity?.

i.e If i consider a sturcutre for example-fishing rod or wind turbine blade, how to decide that the structure is geometrically nonlinear.

Does it requires lots of calculations or by experimentation... For example by just observing the structure, is it possible to decide?

What are the reasons to consider the geometric nonliearities.

Regards

sagar

Modelling water in Abaqus

Hi,

Is anybody able to provide me with a step by step guide of how to model water as a material in Abaqus.

Thanks

MehdiAmiri's picture

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