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delamination of bonded joints

English translation: splitting into thin layers


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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:delamination of bonded joints
English translation:splitting into thin layers
Entered by: Freimanis
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07:25 Apr 25, 2006
English to English translations [PRO]
Tech/Engineering - Aerospace / Aviation / Space
English term or phrase: delamination of bonded joints
The text is from an airworthiness directive.

Is delamination just a fancy word for loosening or it really means parts peeling off in layers.
Freimanis
Local time: 22:46
The Latter
Explanation:
With Reference to this excerpt from the Link it shows that it exactly means the splitting of the materials into thin layers as it is said to be a concern in aviation.

Delamination is an insidious kind of failure as it develops inside of the material, without being obvious on the surface, much like metal fatigue.

Due to increasing use of composite materials in aviation, delamination is increasingly an air safety concern, especially in the tail sections of the airplanes.

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Note added at 28 mins (2006-04-25 07:53:30 GMT)
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The FAA considers that, before structural failure, it may be possible to detect indications of possible failure modes that could result in separation of the vertical stabilizer from the airplane. These indications include edge delaminations, cracked paint, surface distortions, other surface damage, and failure of the transverse (side) load fittings. Similarly, indications of failure of the rudder assembly, which could lead to failure of the vertical stabilizer, may also be detectable with such an inspection. Although neither the FAA nor the NTSB have reached conclusions with respect to these possible failures on the accident airplane . . . .
http://www.yachtsurvey.com/composite_troubles_in_aircraft.ht...


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Note added at 3 hrs (2006-04-25 11:04:47 GMT)
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Thanks all those who agreed(i am a week disallowed to give peer comments)
Selected response from:

Morad Safe
Local time: 00:16
Grading comment
Thank you
4 KudoZ points were awarded for this answer



Summary of answers provided
3 +5The LatterMorad Safe
4 +1peelingtist


Discussion entries: 1





  

Answers


2 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +1
peeling


Explanation:
as the joints are "bonded" this probably is done by means of a glue.
Delamination then indicates the bonding is not adhering anymore. See it as the glue which is peeling off the substrates (e.g glue on glass), or internal crack propagation in the glue itself (e.g. polyester on steel), or the ideal type (where the substrate breaks just below its surface)

Such delamination could be of adhesion or cohesion types. Difference is seen on the bonding surface.

tist
Local time: 21:46
Works in field

Peer comments on this answer (and responses from the answerer)
agree  Trevor Butcher
29 mins
Login to enter a peer comment (or grade)

21 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5 peer agreement (net): +5
The Latter


Explanation:
With Reference to this excerpt from the Link it shows that it exactly means the splitting of the materials into thin layers as it is said to be a concern in aviation.

Delamination is an insidious kind of failure as it develops inside of the material, without being obvious on the surface, much like metal fatigue.

Due to increasing use of composite materials in aviation, delamination is increasingly an air safety concern, especially in the tail sections of the airplanes.

--------------------------------------------------
Note added at 28 mins (2006-04-25 07:53:30 GMT)
--------------------------------------------------

The FAA considers that, before structural failure, it may be possible to detect indications of possible failure modes that could result in separation of the vertical stabilizer from the airplane. These indications include edge delaminations, cracked paint, surface distortions, other surface damage, and failure of the transverse (side) load fittings. Similarly, indications of failure of the rudder assembly, which could lead to failure of the vertical stabilizer, may also be detectable with such an inspection. Although neither the FAA nor the NTSB have reached conclusions with respect to these possible failures on the accident airplane . . . .
http://www.yachtsurvey.com/composite_troubles_in_aircraft.ht...


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Note added at 3 hrs (2006-04-25 11:04:47 GMT)
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Thanks all those who agreed(i am a week disallowed to give peer comments)


    Reference: http://en.wikipedia.org/wiki/Delamination
Morad Safe
Local time: 00:16
Native speaker of: Native in Farsi (Persian)Farsi (Persian)
PRO pts in category: 4
Grading comment
Thank you

Peer comments on this answer (and responses from the answerer)
agree  Jack Doughty
5 mins

agree  Yang Min
1 hr

agree  Marie Scarano: Yes, I have found this term in other sectors as well.
2 hrs

agree  Raging Dreamer
2 hrs

agree  Alfa Trans
9 hrs
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