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Technical Discussions
wei
wei
07:47 Jul-15-2020
Ultrasound: plastic versus reinforced plastic

Hi,
Would like to find out if its true in general that reinforced plastic specifically fibreglass is more attenuative than plastics e.g. PET (polyethylene terephthalate) with regards to ultrasound inspection?

I am asking because am thinking if I could replace the face-sheet of a sandwich panel which is made currently with plastic (PET) and replace with fibreglass so as to provide a more stringent evaluation of the penetration capability of an ultrasound test equipment that i am evaluating. The core of the sandwich panel is Nomex honeycomb core.

The objective of the evaluation is to determine if the ultrasound can penetrate both the face-sheet and the Nomex honeycomb core (i.e. to detect for far-side disbond).

Thanks!



 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 834

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
834
23:50 Jul-16-2020
Re: Ultrasound: plastic versus reinforced plastic
In Reply to wei at 07:47 Jul-15-2020 (Opening).

Yes, any impedance mismatch reduces sound transmission

 
 Reply 
 
wei
wei
02:59 Jul-17-2020
Re: Ultrasound: plastic versus reinforced plastic
In Reply to Anmol Birring at 23:50 Jul-16-2020 .

Thanks Anmol for the reply.

I wasn't able to find any data online on the sound velocity in PET so wasn't sure how big is the acoustic impedance difference from fibreglass.

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 834

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
834
14:33 Jul-17-2020
Re: Ultrasound: plastic versus reinforced plastic
In Reply to wei at 02:59 Jul-17-2020 .

Yes, such information may not be available and you may have to generate experimentally by taking measurements.

1
 
 Reply 
 
Simon Amallraja
Consultant, Advanced NDT Methods
Anu Consultants, India, Joined Aug 2013, 45

Simon Amallraja

Consultant, Advanced NDT Methods
Anu Consultants,
India,
Joined Aug 2013
45
11:47 Jul-20-2020
Re: Ultrasound: plastic versus reinforced plastic
In Reply to wei at 07:47 Jul-15-2020 (Opening).

Hi, if you use high power and high energy UT Systems, you can very well define the defects on many highly attenuating materials like CFRP, GFRP, Engg Plastic, Wood, Rubber, Power etc., with suitable transducers of each application as above. To check the far side defects, you have to optimize the energy, power and probes.

D. Simon Amallraja
amallraja@anuconsultants.net

 
 Reply 
 
Linas Svilainis
R & D,
Kaunas University of Technology, Lithuania, Joined Nov 1998, 68

Linas Svilainis

R & D,
Kaunas University of Technology,
Lithuania,
Joined Nov 1998
68
00:57 Jul-21-2020
Re: Ultrasound: plastic versus reinforced plastic
In Reply to wei at 07:47 Jul-15-2020 (Opening).

Yes, composite material will have more attenuation. Not just impedance mismatch. At least not the way you think. Glass fibres and matrix (epoxy or plastic containing fibers) will create multiple microscale reflections which in turn will scatter the ultrasound. So if composite (if I understood correctly you are thinking of FR4) will go, then plastic will go too. The only difference could be where (which frequency) you will the most scattering. Short fiber reinforced plastic and FR4 most probably be different in attenuation peak freq.

1
 
 Reply 
 
Wei
Wei
02:40 Jul-23-2020
Re: Ultrasound: plastic versus reinforced plastic
In Reply to Simon Amallraja at 11:47 Jul-20-2020 .

Hi Simon,

Thanks for the reply.

For such UT systems, I supposed these are customized systems i.e. not conventional flaw detectors like the Epoch 650? Have you experience any success in using UT system for far-side defect detection of composite honeycomb structures?

 
 Reply 
 

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