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PhD Structural Vibration and Analysis/Computational Mechanics

Submitted by Stephane Bordas on
job
PhD;structural vibration; computational mechanics; New-Zealand;

PhD Scholarship: Structural vibration analysis and computational mechanics

One scholarship is available for a PhD student to pursue research in the School of Engineering at the University of Waikato towards the development of a general analytical procedure for vibration analysis of complex structures. In modelling solid bodies with voids, we will consider treating the voids as embedded negative bodies.

The successful candidate will work with:

Professor Sinniah Ilanko and Dr Yusuke Mochida (University of Waikato, New Zealand)

FEAP - user element subroutines

Submitted by Mubeen on
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Computational Mechanics Forum
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Plasticity
FEAP
user elements

Hi all,

my question is about the history data storage in FEAP.

I am writing element subroutine (elmt01) in FEAP 8.3  for a history dependent problem (crystal plasticity).

I have written the stiffness
matrix subroutine (stiff01), but it needs the data from the previous
solution steps (previous strains, stresses, plastic strains, dislocation
densities .... nh1,nh2=30 per point).

ABAQUS Johnson-Cook damage model

Submitted by Johnson G on
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Ask iMechanica

The constants of the Johnson–Cook fracture criterion D1, D2 ，D3，D4 and D5 are identified from tensile tests or torsion tests, but I don't kown about  the specific procedure to obtain the constants. sigma*=sigma(m)/sigma,sigma(m) is the average of the three normal stresses,sigma  is the von Mises equivalent stress. The sigma （stress）obtained from the tests is corresponding to the which sigma in the equation. Thanks for your information 。

Implementation of p-p Interactions in Molecular Dynamics Simulation

Submitted by Azadeh Sheidaei on
education
molecular dynamics
Potential
pi-pi interaction

Dear All,

I want to simulate polymer system that have pi-pi interaction between


chains and reinforcements. I know there is no implemention of pi-pi


interaction in lammps.


So, Is there another method to consider pi-pi interaction in lammps? or


I can't simulate these system by lammps.




Regards,


Azadeh

Abaqus Quasi-static induced numerical damping

Submitted by lizheng619 on
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Abaqus Quasi-static induced numerical damping

The Quasi-static method for dynamic problem in Abaqus should be carefully used, because it will automatically induce the numerical damping in your calculation.

This method is very conservative, approximately it will introduce 5% numerical damping (damping ratio).

This method is helpful for contact problem and for convergency. But be careful when using it.

FEAP - history variables for Elements

Submitted by Mubeen on
research
FEAP
element subroutines
history dependent problems

Hi all,

my question is about the history data storage in FEAP.

I am writing element subroutine (elmt01) in FEAP 8.3  for a history dependent problem.

I have written the stiffness matrix subroutine (stiff01), but it needs the data from the previous solution steps (previous strains, stresses, plastic strains, dislocation densities .... nh1,nh2=30 per point).

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