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Material selection for vibration damping

Submitted by pirexengaer on

Hi everyone,

 

 I'm searching some solution to absorb vibration. I'm trying to find materials and their properties to compare between them and chose one to design a vibration damper. Their application will be on the base of an avionics enclosure wich is onboard of a UAV (Unmanned Aerial Vehicle).



Post-doctoral Position in Computational Mechanics at Rutgers University

Submitted by cuitino on

 

A postdoctoral position is available in the area of interfacial mechanics of soft materials at Rutgers University working under the supervision of Prof. Cuitino. The position is supported by the National Science Foundation and industrial partners of the NSF Engineering Research Center for Structured Organic Particulate Systems (http://ercforsops.org/).

 

Post-Docoral Research Positions in the area of numerical simulations of coupled thermal-hydro-geomechanical processes

Submitted by Vanessa Van Dyk on

The Idaho National Laboratory (INL) Energy Resources Recovery & Management Department invites applications for one, or possibly two, post-doctoral research positions in the area of numerical simulations of coupled thermal-hydro-geomechanical processes in geothermal reservoirs. The position(s) will be available in October 2009 and will be renewable for up to 3 years. An earlier start is possible, depending on project development.

necessiscity of periodic boundary conditions for uniaxial loading

Submitted by Gouse on

Hi,

I observed that with
periodic boundary conditions on unit concrete unit cell, when uniaxial load is applied structure
behaves as if it is constrained to move in lateral direction, when
shear or other traction laoding is applied it has displacement
compatible behavior i.e, parallel edges has periodic deformation
behavior. With these above behavior can I conclude that for uniaxial
loading I need not apply periodic BCs and simply applying roller is
sufficient on lateral edges or there is no need to apply and periodic
BCs for uniaxial loading.

energy release rate+stress intensity factors

Submitted by Michael M. Michaels on

I'm having a hard time trying to relate the the forces specified in the figure so that I can obtain the expression for the strain energy release rate.

For the 'L-opening load' P when acting alone, the energy release rate is given by: 

 G= (12*P2*L2) / (E*B2*h3)

 

For the '2L/3-opening load' P when acting alone, the energy release rate is given by:

 G=(16*P2*L2) / (3*E*B2*h3)