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Analytical Field definition in boundry condition

Submitted by tahsinopoz on
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Hi Dear iMechanica followers

I came accross a problem when defining displacament boundry conditions. I have been modeling cutting simulation in micron size. so I need to define tool cutter path in a circular shape. I mean cutter should follow the circular or parabolic path not smooth line. To do this I am trying to define analytical distribution in boundary conditions but it doesnt work. I attached the shematic picture of my job of  what I want to do. please look out the attached pdf file and send me your suggestions.

 Thanks in advance

Nanotube geometry

Submitted by Babichev on
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Nanotubes

Hi folks! I deal with buckling nanostructures, contact problem of nanostructures. And i have a problem with geometry construction of nanotube with arbitrary (n, m) chirality. Can any one write the algorithm for building nanotube geometry in 3d space(xyz-Cartesian coordinate system).  Many thanks!

Alex 

I am looking for PhD position in Composite Materials

Submitted by Thiyagarajan Dev on
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manufacturing
composite materials
research
mechanical engineering
applied mechanics
structural analysis
PhD positions
Aerospace engineering

Hi Friends,

Iam looking for PhD positions in Composites Mechanics and Manufacturing area.

If you happen to know any information, kindly convey it to me.

Please find my Resume attached for your information.

 

Thanks and Regards,

Thiyagarajan Dev,

India

Effect of Gurson model parameters on the J integral for a CCP specimen with Abaqus

Submitted by Mohamed H.Miloud on
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Hi

The question is coupling the Gurson model with the crack propagation on a CCP specimen with Abaqus. Then a study of the influence of parameters of the Gurson model J-intgrale  And deduct the best set  of the parameters with we can adjust the JR curve computed on the experimental curve

 

Pijaudier-Cabot and Bazant concept of non local damage

Submitted by ss09 on
research

Hello all,

I would like to seek help on a topic on which I am slightly ignorant.

I do not understand the concept of non local damage and the internal length of the non local continuum as described by the well quoted paper of Pijaudier-Cabot and Bazant (1987) in continuum damage mechanics.  So may I please ask the experts in this forum to please explain to me using some simple analogy.

Dependence of relaxation time on the polymer length (via a string of viscoelastic springs)

Submitted by kongdong on
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polymer relaxation time

Dear all,



According to polymer theory, the relaxation time depends on its length (or unit number), and there exist some relationships to describe such dependence. The smaller number of polymer units, the smaller the relaxation time  of the polymer is. How to describe this via a simple model of visco-elastic springs?



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