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wear of articulating surface of joint replacement

Submitted by Muhsin Salim on

Hi everyone out there...

Now i'm working on biomechanics research project which deals with the articulating surface of joint replacement, where one of the main problem were the wear of sliding contact (i.e., metal on polymer,metal on metal or polymer on ceramics).wear debris or particles generated from this articulating surface can causes the damage of the bone cell around the joint replacement.My question are;

Two Questions in Concrete Modeling

Submitted by m_meisam on

Dear  Friends

I've 2 questions:

1) I use abaqus cae for concrete modeling and how can I attech a file (subroutine/etc.) to my model?

2) which category I should use for concrete while making a part(shell/solid)? while I'm trying to make a section , only shell section have a rebar layer and solid section dont have this option! what should I do?

Regards

Meisam M.

K&C Model for UMAT

Submitted by Zon Dol on

Hi everyone

I want to use Abaqus Implicit UMAT with K&C model to modelling concrete behavior .

As I know, when using Implicit, we have to update Jacobian stiffness matrix.

Is there anyone can help me? Please show me how to establidh and update stiffness matrix for K&C model.

Thank you very much,

Zon Dol 

meshfree softwares or packages

Submitted by babak on

Hello to everybody

I want to detect strain localization in geological materials and follow the path and the way that shear band propagate in seismic condition, so I want to know is there any meshfree commercial package to handle dynamic nonlinear analysis for geological materials specially rock and soil. Does exist Even a good source code that i improve it (not so much) and make it effecient for my purpose ?

I appreciate anyone help me and give me information in such field.

Truly

Babak

Unsymmetric Direct Solver

Submitted by Karma Yonten on

Hi all,

I'm looking for an efficient solver written in Fortran (preferably fortran 90 or later versions) to solve unsymmetric system of equations using finite element method.  I've an in-house FE code which lacks an efficient unsymmetric solvers (like skyline and sparse solvers). I found some symmetric solver subroutines online, but couldn't find any for unsymmetric case. Any suggestions and recommendations will be much appreciated.

Karma 

The factory idiom and material models

Submitted by Biswajit Banerjee on

I'm leaving the US in a couple of days and will probably take a hiatus of a few months from iMechanica.  Before I leave, I want to tell you about a C++ idiom that eases the implementation and use of multiple material models in a computational mechanics code.