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Technical Discussions
Harry
Harry
16:24 Aug-27-2012
NDT OF the trimmed CFRP


Hi,

I trimmed CFRP with CNC machine, There is no pull-out fiber. I wanna check edge delamination. I checked immersion ultrasound and shearography tests. There is no sign of delamination, but in immersion ultrasound, I didn't have speed of sound in fiber composite and also I didn't have any idea about the frequency test. Does have someone any idea that how can we check edge delamination and what is the best way to do that. Does have someone any experience with immersion ultrasound to check CFRP.

Thank you in advance
Harry

 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 528

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
528
00:28 Aug-28-2012
Re: NDT OF the trimmed CFRP
In Reply to Harry at 16:24 Aug-27-2012 (Opening).

Harry
A few points on this
Velocity in CFRP is usually around 2800-3000 m/s
You should not use imersion for this -water will seep into any
Edge delaminations and make them invisible.

Dry the part out and use pulse echo UT being careful to keep the
Edges dry. A standard delay line probe along the edges should be ok.
Or use phased array if you want images.
Our array wheel probe is pretty good, but you can doit with anything really

Another approach is air-coupled UT -you will need to mask the edges though as other wise you will get
' bleed around' - I suspect this may be more of an investment than is justified however.

Good luck

Joe

 
 Reply 
 
Sudheer Jai Krishnan
Sudheer Jai Krishnan
16:31 Aug-28-2012
Re: NDT OF the trimmed CFRP
In Reply to Harry at 16:24 Aug-27-2012 (Opening).

a 5Mhz delay line will do the job for finding out delams in the edges.Also you may try a very easy technique with a Bondmaster which is really an easy job. Most of the aircraft industries uses this equipment for checking Honeycomb, CFRP etc.

 
 Reply 
 
Adel
Adel
11:55 Aug-31-2012
Re: NDT OF the trimmed CFRP
In Reply to Sudheer Jai Krishnan at 16:31 Aug-28-2012 .

Dear Harry,

Infrared thermography (IRT) is a good method to check the delamination in the CFRP.
However, checking the edge we don't have an experience with this.
If possible we can do some tests for you.

Regards,
Adel

 
 Reply 
 
collin maloney
NDT Inspector, - Plant Inspector
Applus RTD, Australia, Joined Nov 2000, 147

collin maloney

NDT Inspector, - Plant Inspector
Applus RTD,
Australia,
Joined Nov 2000
147
10:10 Sep-02-2012
Re: NDT OF the trimmed CFRP
In Reply to Harry at 16:24 Aug-27-2012 (Opening).

it appears that if your asking about immersion testing your no worried about moisture, so why not use Dye check?

 
 Reply 
 

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