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Molecular Dynamics from Solid Mechanics Point of View

Submitted by saurabhdixit1987 on
research
test
dynamics
tensile
molecular

I am searching for a tutorial or a book which looks into molecular dynamics method from a Solid Mechanics point of view. All I can find are the books written for biophysicists or chemistry. I can find lot of examples on fluids, biomolecules or polymers but none of them are on simple solids or metals.

Can anyone suggests me a book or a tutorial which can get me ready to write a program to simulate a simple tensile test of a metal wire (FCC Al or some simple crystal).

 

UEL ABAQUS Subroutine

Submitted by aida on
research
nonlinear
User subroutines in ABAQUS
UEL

Hi,

I'm stucking with my subroutine. May ask anybody to have a look the the file. 

I run a simple model that and try to run it,but an error message was appeared as below;   ***ERROR: USER SUBROUTINE UEL MISSING

 

I don't know what is the problem. I did locate the input (.inp) and user (.f) in the same folder and run it (abaqus job=.... user= ...ff int )

 

Hope to get help from anybody...

 

Aida

Dugdale -Barenblatt cohesive zone model outside the contact zone

Submitted by rdalmeya on
research
cohesive zone model

Dear sir

        I am Ravi dalmeya doing Phd from Indian Institute of Technology,Kanpur (India). I am doing work on adhesive elastic wavy  thin film. I have completed 2-D Hertzian contact between cylinder and elastic half space using Abaqus. Now i want to apply Dugdale-Barenblatt cohesive zone model outside the contact zone and i do not know  how to apply  Dugdale-Barenblatt cohesive zone model outside the contact zone.Can you give me some suggestion?



Thanking you



Ravi dalmeya

is there any proper model for the fatigue crack tip stress-strain field?

Submitted by Chen Long on
research

dear my friends:

 I am a new one in the fatigue crack study. as we all konw, there is a crack resistant near the crack tip before its cracking. HRR model has been well testfied in monotanic crack, so i wonder whether it can be expanded to the cyclic crack situation or not! if yes, so how to describe the stress-strain distribution just nearby the tip? can we define a similar resistant value in the cyclic status?and is the stress redistribution concept right for the stress harden material?

any suggestions would be appreciated!

regards, Long

Displacement control VS. force control in Abaqus

Submitted by mahmood seraji on
research
methods of loading

Dear friends,



I have modeled a simply supported beam, using wire and the circle section of 1mm and a length of 110mm. I did two analyses


1) I used the distributed load of 0.2 N/mm (where the beam behaves in
the elastic area) and got the maximum displacement (at center).   

2) I used the obtained max displacement (from first analysis) as a
displacement control. the results of the reaction forces are supposed to
like the distributed load at first analysis, but it is much lower.

The surface effect on the strain energy release rate of buckling delamination in thin film–substrate systems

Submitted by tongqing.lu on
research
thin film
surface effect
buckling delamination

Gurtin–Murdoch continuum surface elasticity model is employed to study the buckling

delamination of ultra thin film–substrate system. The effects of surface deformation and

residual stress on the large deflection of ultra thin film are considered in analysis. A

concept of effective bending rigidity (EBR) for ultra thin plate is proposed on the basis of

Gurtin–Murdoch continuum theory and the principle of minimum potential energy. The

governing equations with EBR are formally consistent with the classical plate theory,

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