Post on 27-Mar-2021
Effective Testing of Composite Laminates by
Using A New Multi-Element Transducer
Dr. Ralf Steinhausen1 Dr. Mario Kiel1
Andreas Bodi² Tobias Gautzsch² 1 Forschungszentrum Ultraschall Halle gGmbH, Germany, ralf.steinhausen@fz-u.de ² SONOTEC Ultraschallsensorik Halle GmbH, Germany, t.gautzsch@sonotec.de
NDT in Canada 2018 | June 19-21 | Halifax, NS
OU
TL
INE
Introduction
Motivat ion
Phased-Array ACUT Probe
Broadband Mult i-Element ACUT Probe
Applicat ion
Test Results
Conclusion
NDT in Canada 2018 | June 19-21 | Halifax, NS
Introduction
NDT in Canada 2018 | June 19-21 | Halifax, NS
Motivat ion –
Frequency Dependent Flaw Detect ion
365 – 390 kHz 390 – 403 kHz 403 - 415 kHz 415 - 428 kHz 428 - 440 kHz
5 Scans
Equal Setup
5 different center frequencies
The detectability of delaminations and
the outline of the f law is frequency
dependent
High Bandw idth Transducers could lead
to a better detection and sizing of
delaminations
Test object: Composite w ith delamination
Spectral Analysis
NDT in Canada 2018 | June 19-21 | Halifax, NS
Phased-Array ACUT Probe
3 Elements
Equally sized
Structured Electrode
Annular Array
Piezocomposite
Transducer
Dice and Fill
400 kHz
Small
Bandw idth
Single Peak
Spectrum
NDT in Canada 2018 | June 19-21 | Halifax, NS
380 380 380 380
Broadband Mult i-Element ACUT
Probe 3 Elements
Equally sized area
Structured Electrode
Annular Array
380, 400 and 420
kHz Elements
Wider Bandw idth
Three Peak
Spectrum
Shorter A-Scan
Burst
400 kHz
420 kHz
380 kHz
NDT in Canada 2018 | June 19-21 | Halifax, NS
Broadband Mult i-Element ACUT Probe –
Test Results
NDT in Canada 2018 | June 19-21 | Halifax, NS
Applicat ion
400 kHz through
transmission
Phased-Array transducer
Ø2 mm detectable
Reference scan
NDT in Canada 2018 | June 19-21 | Halifax, NS
Test Results - Scans
380 kHz 400 kHz 420 kHz
Differences in Amplitude drop
Differences in interference pattern
Less focused than the reference scan
NDT in Canada 2018 | June 19-21 | Halifax, NS
Test Results – Spectral Analysis
NDT in Canada 2018 | June 19-21 | Halifax, NS
Test Results – Exemplary Analysis
NDT in Canada 2018 | June 19-21 | Halifax, NS
Conclusion
A w ider bandw idth can be achieved w ith dice and f ill composites
Spectral analysis can be used as a contrast mechanism w ith high
bandw idth probes
The detection and sizing of delamination and f law s in composites
can be improved w ith this contrast mechanism
NDT in Canada 2018 | June 19-21 | Halifax, NS
SONOTEC Ultraschallsensorik Halle GmbH
Nauendorfer Str. 2
06112 Halle (Saale)
Germany
www.sonotec.eu
Application Engineer NDT
Tobias Gautzsch
t.gautzsch@sonotec.de
Headquarters
Germany
Ultrasound is our strength.
SONOTEC US Inc.
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USA
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