Re: Carbon Composite Tubing Wall Thickness Measurement

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Re: Carbon Composite Tubing Wall Thickness Measurement
Posted by: Joe Buckley (PID_358), E-mail: joe@buckley.net, on December 12, 2001 at 17:42 :
In Reply to: Re: Carbon Composite Tubing Wall Thickness Measurement posted by : John O'Brien , E-mail: obirc@aol.com, on December 12, 2001 at 16:35 :
I'm sure this will work adequately, but you do need to be realistic in terms of what would expect from a pulse-echo UT system on Carbon. There are two main issues.
1. Most composite materials are relatively attenuative, so the frequency you can use will be limited (typically 5MHz or so maximum) this limits the resolution of the thickness measurement compared to what is achievable with steel.
The ultrasonic velocity in CC materials will tend to be inconsistent (highly dependant on composition and manufacturing parameters) and may be quite temperature dependant. - variations of a few % are typical
so do some work to ensure that you can get the accuracy you require.

: If the use of water is not a problem UT Immersion Systems would be applicable. Another approach might be to use an Internal Rotating UT System depending upon whether you want to measure in a manufacturing environment or post installation.
.
: Try looking at NDT Automations Tubescan System. This is an internal 100% coverage rotating systm with dual gates which would allow you to profile internal and external in one go.
.

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: I'm sure this will work adequately, but you do need to be realistic in terms of what would expect from a pulse-echo UT system on Carbon. There are two main issues. . : 1. Most composite materials are relatively attenuative, so the frequency you can use will be limited (typically 5MHz or so maximum) this limits the resolution of the thickness measurement compared to what is achievable with steel. . : The ultrasonic velocity in CC materials will tend to be inconsistent (highly dependant on composition and manufacturing parameters) and may be quite temperature dependant. - variations of a few % are typical . : so do some work to ensure that you can get the accuracy you require. : . : : : If the use of water is not a problem UT Immersion Systems would be applicable. Another approach might be to use an Internal Rotating UT System depending upon whether you want to measure in a manufacturing environment or post installation. : . : : Try looking at NDT Automations Tubescan System. This is an internal 100% coverage rotating systm with dual gates which would allow you to profile internal and external in one go. : . .

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