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- since 1996 -

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Technical Discussions
ASHU
R & D,
DRDO KANPUR, India, Joined Jan 2017, 1

ASHU

R & D,
DRDO KANPUR,
India,
Joined Jan 2017
1
12:41 Jan-16-2017
HAMMER TESTING

Hello,

I have recently started to work on NDT. I want to find defect (delamination) on composite by using impact hammer test equipment.
i have one query how to see mode on Frequency function response Graph and how to get that which mode for bending aand torsional rigidity

plzzz reply soon

 
 Reply 
 
Ian S
Ian S
19:23 Jan-16-2017
Re: HAMMER TESTING
In Reply to ASHU at 12:41 Jan-16-2017 (Opening).

Tap it gently
If it goes " Ding " then it's ok
If it goes " Dong " then it's not so good
If it goes " Dung " then it's $h!t

 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
20:06 Jan-17-2017
Re: HAMMER TESTING
In Reply to Ian S at 19:23 Jan-16-2017 .


What a DING way of putting it. Very Nice

P V SASTRY

 
 Reply 
 
Amit G
Teacher,
NICMAR, India, Joined Jul 2015, 1

Amit G

Teacher,
NICMAR,
India,
Joined Jul 2015
1
11:02 Jan-23-2017
Re: HAMMER TESTING
In Reply to Ian S at 19:23 Jan-16-2017 .

Egg jhact Ly!

Sound based: That's when you use Hammer ONLY... and your ears as sensors and mind and experience for processing and inference.

Working on any specific project?

 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 894

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
894
16:56 Jan-24-2017
Re: HAMMER TESTING
In Reply to Amit G at 11:02 Jan-23-2017 .

Ian, I love your reply (lol).

Seriously, to have done this type of inspection before and with today's technology, I wonder why people still perform this type of inspection? We have instrument that can better and more accurately delimit the size of lamination. For one thing, the hammer is based on the inspector's ability to hear properly, than to ensure the hammer testing cover the surface 100 percent with the same intensity and finally to possibility of introducing small damage in the microstructure.

 
 Reply 
 
Godfrey hands
Consultant,
PRI Nadcap, United Kingdom, Joined Nov 1998, 307

Godfrey hands

Consultant,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
307
09:26 Jan-30-2017
Re: HAMMER TESTING
In Reply to Michel Couture at 16:56 Jan-24-2017 .

Michel,
I have made tests with one of these instruments in a sales demonstration (set-up by the manufacturer) where the instrument was totally unable to identify delaminations in the skin or disbond between skin and honeycomb.
However, most manual inspectors were able to "hear" the difference with the hammer (at least the disband), as was the instrument manufacturer.

I appreciate that there are cases where such instruments can also out-perform the individual inspector, especially when they have been working for a long time or in a noisy environment (Hammer test should never be used under those circumstances) , so therefore consider these two technologies to be complementary rather than either/or.

Godfrey

 
 Reply 
 
J.B.
J.B.
19:10 Jan-30-2017
Re: HAMMER TESTING
In Reply to Godfrey hands at 09:26 Jan-30-2017 .

Michel, Godfrey,
to learn about the copabilities of taptesting you should read the FAA report about NDT, especially the Taptest sections and the PODs related.
http://www.tc.faa.gov/its/worldpac/techrpt/tc15-63.pdf
Compare the NTM-Documents 51-10-03 and 51-10-19 from this source
http://docslide.us/documents/start-55845ab688189.html
to get an idea how the above mentioned exercises have been performed.

So taptesting is astonishing reliable - refer also to the following document:
https://www.osti.gov/scitech/servlets/purl/1145750
Go for page 32 to see a POD comparison of different resonance techniques
J.B.

By the way: I would strongly recommend the reading of all the SANDIA/FAA documents from the Albuquerque AANC Labs about capabilites of NDT methods. They are the best sources of POD studies published openly. There are a lot, and the pool is steadyly growing.
(AANC-Aging Aircraft NDI Validation Center sponsored by FAA)

 
 Reply 
 

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