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274 views
05:53 Jun-09-2005

Adeel

Student
KAIST,
South Korea,
Joined Jun 2005
4
Lamb Waves

Hi Everybody
I want to perform experiment for the "Damage detection in concrete structures using Lamb Waves". So any body can tell me that Are Lamb waves can be used to detect damages in thick materials cos i have read that they are mainly used for thin plates.
Also what experimental setup i need to build to perform my experiment on it.
Thanx and Regards


 
09:10 Jun-10-2005
Ed T.
Re: Lamb Waves ----------- Start Original Message -----------
: Hi Everybody
: I want to perform experiment for the "Damage detection in concrete structures using Lamb Waves". So any body can tell me that Are Lamb waves can be used to detect damages in thick materials cos i have read that they are mainly used for thin plates.
: Also what experimental setup i need to build to perform my experiment on it.
: Thanx and Regards
------------ End Original Message ------------

Lamb wave or plate wave propagation is normally generated between two parallel surfaces of a test object. For an object to sufficiently support Lamb Waves or plate waves, it must be thin enough to allow penetration of a surface wave to the opposite surface.
I don't believe Lamb waves would be able to exist in concrete. The OD and ID surfaces must be parrallel and the material must be extremely thin to generate Lamb Waves. You may want to look at low frequency longitudinal waves.




 
01:26 Jun-11-2005

Adeel

Student
KAIST,
South Korea,
Joined Jun 2005
4
Re: Lamb Waves ----------- Start Original Message -----------
: : Hi Everybody
: : I want to perform experiment for the "Damage detection in concrete structures using Lamb Waves". So any body can tell me that Are Lamb waves can be used to detect damages in thick materials cos i have read that they are mainly used for thin plates.
: : Also what experimental setup i need to build to perform my experiment on it.
: : Thanx and Regards
: Lamb wave or plate wave propagation is normally generated between two parallel surfaces of a test object. For an object to sufficiently support Lamb Waves or plate waves, it must be thin enough to allow penetration of a surface wave to the opposite surface.
: I don't believe Lamb waves would be able to exist in concrete. The OD and ID surfaces must be parrallel and the material must be extremely thin to generate Lamb Waves. You may want to look at low frequency longitudinal waves.
------------ End Original Message ------------

Hi ED T
Thanx for ur reply. The reason i asked you that whether Lamb Waves can be used for damage detection in concrete is that i read one paper in which this Lamb wave was used to detect damage in Concrete structure. The specimen used had cross section of 300 X 200mm and was 300mm thick. Do you think with such dimensions Lamb Wave can be generated and damage can be detected.
If u want i can send you that paper as well.
Thanx


 


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