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Technical Discussions
bourgeois yvan
France, Joined Apr 2012, 2

bourgeois yvan

France,
Joined Apr 2012
2
15:10 Apr-25-2012
how to create artificial flaws in composite plates

I would like to know how to create artificial flaws in composite plates?

Thank you

    
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
16:54 Apr-25-2012
Re: how to create artificial flaws in composite plates
In Reply to bourgeois yvan at 15:10 Apr-25-2012 (Opening).

Is this during or after plate manufacture?

    
 
 Reply 
 
bourgeois yvan
France, Joined Apr 2012, 2

bourgeois yvan

France,
Joined Apr 2012
2
19:03 Apr-25-2012
Re: how to create artificial flaws in composite plates
In Reply to Nigel Armstrong at 16:54 Apr-25-2012 .

It's before plate manufacture.

For example, to create an inclusion, I put a teflon wafer betwenn 2 plies before RTM process.

After creating defects, I would like to control my plates by ultrasonic control.

    
 
 Reply 
 
flavio vendramin
NDT Inspector,
TAG s.r.l. Cremella ( Lecco ), Italy, Joined Apr 2010, 42

flavio vendramin

NDT Inspector,
TAG s.r.l. Cremella ( Lecco ),
Italy,
Joined Apr 2010
42
10:59 Apr-27-2012
Re: how to create artificial flaws in composite plates
In Reply to bourgeois yvan at 15:10 Apr-25-2012 (Opening).

After RTM process is possible to create a impact damage at various load or a little spotface by milling.
Before RTM to create delamination by various type of plastic material sheet ( different attenuation during UT inspection) not only PTFE.
bye

    
 
 Reply 
 
norm woodward
norm woodward
16:00 Apr-27-2012
Re: how to create artificial flaws in composite plates
In Reply to bourgeois yvan at 15:10 Apr-25-2012 (Opening).

In simulating damage in a composite structure, the first things to ask is what kinds of defects are being sought and what methods of detection am I contemplating.

For example, low frequency eddy current and x-ray might be able to find “disbonds” simulated with flat bottomed holes, yet be useless in finding real disbonds in metallic structures. Likewise, thermography, and again radiography, might be able image Teflon inserts, yet not be as successful in real applications.

Conversely, sometimes the more basic (ruthless) approach is the best approach. A thin, sharp blade shoved into the edge of a glue line of a bonded structure might create the perfect disbond simulation, while a properly applied ball-peen hammer might produce a great “simulation” of in-service impact damage.

    
 
 Reply 
 

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