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Acoustic refrigeration in Mobile phones

Submitted by shubhamkanungo… on

 I think having Multi Function and multi tasking Mobile Phones r having problem of call drop as compared to other phones having less features the reason being as heat flows from High temperature(Mobile) to low temp(atmosphere) , Infrared radiation creates a barrier to the signal wave and such problem can be rectify by mobile cooling may be done Acoustically.

Transverse moduli for composite

Submitted by KennyNg on

I'm currently working on modeling 3 phases composites material. However, I'm having hard time on finding the transverse modulus as it's different from analytical results. I've been using Mori-Tanaka approach to determine the stiffness moduli. Does anyone know how to obtain a correct values for the transverse moduli? 

Modelling 2D instead of 3D in ABAQUS

Submitted by parisa on

Hi,

I modeled a beam with a hole in ABAQUS in 2D and now I would like to stick one plate to the beam surface.

I can do it easily in 3D but actually I do not like to jump 3D because It will make analyses very hard to follow.

My question is that, Is there anyway to stick a the plate to beam in 2D in ABAQUS and avoid 3D?

Thank you,

Parisa

Aircraft Wing Dynamics

Submitted by sourishchakravarty on
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Hello,

I am looking for any resource where I can get some data regarding the average force and its time variation with which the wind applies force onto an aircraft body especially the wing. To reframe the question in a better way: can anyone recommend a resource that has data about the wind velocity profile around the aircraft (especially the wings) or pressure/shear force profile on the boundary of the aircraft (especially the wings) during various phases in its flight. 

ANSYS VISCOELASTIC MODELING

Submitted by saurabh_2110 on

Hi,

 I am trying to model a sheet of Poly Vinyl Butryl (PVB), which is a viscoelastic material in ANSYS. I have all the regular properties like elastic, shear and bulk modulus, poisson ratio, denstiy and damping factor. I also have a stress- strain curve of PVB. With all this data, is it possible for me to find the various constants in the viscoelastic models using ANSYS?

 Thanks

Saurabh 

Torsion of annular rod with longitudinal slit

Submitted by bfinio on
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I have a question regarding simple torsion of a circular shaft with a uniform cross section. Given a hollow circular shaft with inner radius R1 and outer radius R2, length L, shear modulus G, fixed-free boundary conditions and applied torque T about the central axis, the equation for the rotation angle at the end of the beam is

 phi = T*L/(J*G)

where J = pi/4*(R2^4-R1^4)