Help needed on VUINTER to define molecular interaction between two surfaces
Hi,
Does anyone have any idea on using VUINTER to define adhesive contact between a hard body and a soft body (the potential between the two surfaces is molecular like van der waals or lennard-jones potential).
Coupling FEM and Monte Carlo
I wnat simulat rollong process. Mteral deformation is simulated by FEM and i want simujlate microstructure evolution by KMC method. Do any one have experience in this field (coupling FEM and KMC) ?
Coupling FEM and Monte Carlo
I want simulat micro strucure evolution in metal fromind, e.g. rolling. To capture grain growth or refinement, i use MC method and rolling process simulate by FEM method (ABAQUS). Do any one have experience in this field?
Can a beam act like a spring in relation to other spring?
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a simply supported beam (length= L) is subjected to an upward force= F at the middle , at the same time there is a spring above the top of the beam at the middle too and the spring is subjected to a downward force = - F .
the spring stiffness is k1, beam stiffness k2 (which equal to the force which produce 1mm deflection at the middle of the beam i.e = 48EI/L^3 ).
the spring stiffness is k1, beam stiffness k2 (which equal to the force which produce 1mm deflection at the middle of the beam i.e = 48EI/L^3 ).
the beam can be steel beam UPN 80 , considering weak axis Y (19.4 cm4)
An interesting arXiv paper: "Precession optomechanics"
Hi all,
Just thought that the following paper archived at the arXiv yesterday could be of general interest to any mechanician:
Xingyu Zhang, Matthew Tomes, Tal Carmon (2011) "Precession optomechanics," arXiv:1104.4839 [^]
The fig. 1 in it makes the matter conceptually so simple that the paper can be recommended to any mechanician for his general reading, and not only to a specialist in the field.
--Ajit
[E&OE]
I was wondering what is origin of weak form in continuum mechanics.
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Last day, I took my class of Nonlinear Analysis of solids and structures.
And I learned about the strong form & weak form in the prilciple of Virtual work.
I can find the origin of those two form that is from Piola-Kirchhoff stress tensor.
but why Integral form is called "weak form"? why Differential form is called "strong form"? why?
I was just wondering.
Mixed hardening Amstrong-Frederick and Ludwik J2 plasticity model VUMAT implementation
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Hi, I’m trying to implement a mixed hardening J2 plasticity model. The idea is to use the Ludwik law to represent the isotropic hardening and the Amstrong-Frederick law for the kinematic hardening, both combine in a J2 classic von Mises model.
I need some advice for the return mapping algorithm.
Once that I have check that the elastic trial state is not plastically admissible I have to solve a three equation system, where the first two are a tensor equations and the third one is the J2 yield function equation.
The 48th Annual Technical Meeting of Society of Engineering Sciences will be held October 12-14, 2011
The 48th Annual Technical Meeting of Society of Engineering Sciences will be held October 12-14, 2011 at Northwestern University Evanston, Illinois 60208, USA. The meeting will have 43 symposia covering a wide range of topics in engineering sciences. To learn more about the conference and submit an abstract, please check the conference webpage www.ses2011.org.
MODELING COUPLING EFFECTS IN CORD-RUBBER COMPOSITE STRUCTURES
An analytical model is developed to study the coupling effects in
cord-rubber composite materials. The analytical model takes into account
the mismatch of stiffness between the cords and the rubber matrix
material, and the twist-extension coupling. The transverse deformation,
i.e., normal to the cords direction is based on the normal modes of a
special system which describes the orthotropic and the coupling
behaviour of cord-rubber composites. The equations of motion for the
cord-composite plates are derived using the principle of virtual work.
Results of deformation and stresses are obtained for some typical
cord-rubber composite plates and are compared to the existing solutions.
The results presented illustrate that the coupling effects are