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Technical Discussions
Volkan Eritmen
Sales,
Innerspec Technologies, Spain, Joined Jan 2019, 5

Volkan Eritmen

Sales,
Innerspec Technologies,
Spain,
Joined Jan 2019
5
16:12 Sep-19-2019
Surface Waves in Rubber

Formula

Hi all,

I am trying to create a surface wave in hard rubber. This is rubber is used for colour coating of aluminium coils. If the rubber roll has surface damage it can cause uneven colour coating on these coils, which is unacceptable for the final customer.

The idea is to use a surface wave to inspect the roll after the grinding process to detect any possible defects. In general defect sizes and geometry are not specified yet but it certainly include surface cracks of at least 0,5 mm depth and a length of 5 mm.

I have been thinking of using the following equation to find out the corresponding angle of the wedge sensor:

Does anybody already have any experience in creating surface wave in rubber?

Is there any hope of success as rubber tends to attenuate the ultrasound wave?

What should be the frequency of the transducer to create such a wave?

Best Regards,

Volkan Eritmen

Wiesław Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 268

Wiesław Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
268
20:47 Sep-19-2019
Re: Surface Waves in Rubber
In Reply to Volkan Eritmen at 16:12 Sep-19-2019 (Opening).

Generating surface waves in rubber could be difficult, since the sound speed and attenuation of shear waves in rubber are very low. It could be realistic only at very low frequencies.
My suggestion is to apply subsurface waves (at first critical angle). But since rubber has a sound speed very close to water it will not work perfectly with water, but only with a fluid with much lower sound speed. The best solution could be alcohol. Other fluids (as far as I know) are quite difficult in application or/and quite exotic. It is possible to use alcohol enclosed in a containment with a thin membrane, that should be in contact with rubber.

If you want help in such application, we would be able to help. Please contact me directly.

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