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ABAQUS Johnson-Cook damage model

Submitted by Johnson G on
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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).

LRET Lecturer/Senior Lecturer/Reader in Safety and Reliability Engineering: University of Aberdeen

Submitted by Rajib on
job
reliability
engineering
reliability based design optimization.

School of Engineering

LRET Lecturer/Senior Lecturer/Reader in Safety and Reliability Engineering

Reference Number 1231244



Building on a 20-year track record in safety engineering, the School of Engineering at the University of Aberdeen in partnership with The Lloyd's Register Educational Trust (The LRET) is establishing a centre of excellence for research and teaching in the safety and reliability of engineering systems, structures and processes.

Scanning Valves Efficiently And Precisely Is Often A Nightmare

Submitted by profilometer on
mechanician

PROFILOMETER

Traditional ways of valve inspection using a contact profilometer are making way for the more recent non contact valve inspection technologies. Even though many of the specs of surface roughness globally are set as per the findings by a contact profilometer the ease of non-contact inspection systems plus the speedier technique of employing the high tech valve inspection technologies are definitely behind why significantly more professionals are purchasing the newest non-contact profilometer.

Great things about a customized valve inspection set-up

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