Viscoelastic material for damping high frequencies?
Viscoelastic material for damping high frequencies?
(OP)
Hello all,
I would like to know if there is any viscoelastic material that is more suited or designed to damp high frequencies - 15000 - 16000 Hz ? I mean having loss factor near to 1 around this frequency range? Most of the commercially available tapes are designed for 1000 Hz range.
Thank you
Geoff
I would like to know if there is any viscoelastic material that is more suited or designed to damp high frequencies - 15000 - 16000 Hz ? I mean having loss factor near to 1 around this frequency range? Most of the commercially available tapes are designed for 1000 Hz range.
Thank you
Geoff





RE: Viscoelastic material for damping high frequencies?
Damping is achieved by lossy materials (materials that are soft but inelastic). I.e. in the DMA curve they have a high tan delta value (loss factor) in the frequency range you're interested in. Usually higher mass is good too, for example using a dense filler like barium sulfate or magnetite.
At higher frequencies materials behave more stiffly and elastically. So, you need to use a material with very low glass transition temperature (Tg). I know you can buy Sorbothane mats. Do they work at that frequency?
Chris DeArmitt - PhD FRSC CChem
RE: Viscoelastic material for damping high frequencies?
RE: Viscoelastic material for damping high frequencies?
Presently I am using 3M ISD 112 tape whose loss factor droops to 0.3 by 10kHz. It's greatest loss factor is around 1kHz.
It is not a shock event, but a forced vibration at 16kHz.
Demon3 - Can you please explain what you mean by 'higher mass is good too'. Do you mean to say that instead of traditional 5% of vibrating mass, should we go for 10 or 20% while designing tuned mass?
I am actually looking for something sticky tape - like that of 3M Viscoelastic tapes. If I get non-sticky polymer I may have to again think of using some adhesive to mount it on structure.
I will contact Sorbothane and Lord Chemicals. Thank you for your suggestions.
Kind regards
RE: Viscoelastic material for damping high frequencies?
Chris DeArmitt - PhD FRSC CChem
RE: Viscoelastic material for damping high frequencies?
RE: Viscoelastic material for damping high frequencies?
Chris DeArmitt - PhD FRSC CChem