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- since 1996 -

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Technical Discussions
Jignesh Dhimar
NDT Inspector,
LMATS, Australia, Joined Apr 2015, 4

Jignesh Dhimar

NDT Inspector,
LMATS,
Australia,
Joined Apr 2015
4
07:59 Aug-23-2019
Finding Debonding between composites

Hello All,

Could anyone help me out with below mentioned two different cases

Case I- Sandwich structure made of Carbon Steel (CS-5 mm) + Polyurethane (PU-10 mm) + Carbon Fibre (CF-10mm). is there any practical solution to find debonding(planner or volumetric) between Interface 1(CS-PU) and Interface 2 (PU-CF).
Access for UT from only one side (Carbon steel side)

Case II- Sandwich structure made of CF (15 mm)+ PU(15mm) + CF (10 mm).
Same finding as Case I.
Access from only one side.

    
 
 Reply 
 
Wiesław Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 256

Wiesław Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
256
10:37 Aug-23-2019
Re: Finding Debonding between composites
In Reply to Jignesh Dhimar at 07:59 Aug-23-2019 (Opening).

Immersion or contact testing should be possible in the first case, but it will be necessary to use transducer with quite short pulse and quite sophisticated signal analysis, since the difference between total reflection and transmission into plastic is not very strong and many internal reflexions in steel can be expected.
Second case is more difficult due to the fact, that CF and PU are not very different and CF is quite attenuating. It should work, but requires careful development of suitable procedures.

2    
 
 Reply 
 
Anand
India, Joined Jul 2016, 1

Anand

India,
Joined Jul 2016
1
10:40 Aug-23-2019
Re: Finding Debonding between composites
In Reply to Jignesh Dhimar at 07:59 Aug-23-2019 (Opening).

Hi,
Myself Anand.

I think UT will work for composites.Based on my work experience I'm telling. But the combination of metal and composites, I am not sure.

Thanks.

    1
 
 Reply 
 
Daniel Braun
Daniel Braun
12:49 Aug-23-2019
Re: Finding Debonding between composites
In Reply to Jignesh Dhimar at 07:59 Aug-23-2019 (Opening).

Generally it is possible, if you have the samples available - you may ship them to Sonotron NDT A-Lab for performing the trials and laying out the necessary setup (instrument, probe, settings) - if you're interesting simply e-mail and we'll proceed further. The service is FOC

    
 
 Reply 
 
Andres Romero
Spain, Joined Jul 2019, 4

Andres Romero

Spain,
Joined Jul 2019
4
04:26 Aug-24-2019
Re: Finding Debonding between composites
In Reply to Jignesh Dhimar at 07:59 Aug-23-2019 (Opening).

zoom image
Hello, sorry for my English is not good.
If possible, by immersion. With squirt machine.
Several frequencies are needed.
    
 
 Reply 
 

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