caa a22 4500 60617320X CHVBK 20210128100732.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10921-015-0283-y doi (NATIONALLICENCE)springer-10.1007/s10921-015-0283-y Comparative Study of State of the Art Nondestructive Testing Methods with the Local Acoustic Resonance Spectroscopy to Detect Damages in GFRP [Elektronische Daten] [Christoph Hornfeck, Christian Geiss, Markus Rücker, Christian Grosse] This paper evaluates and compares the application of current state of the art methods and the new local acoustic resonance spectroscopy (LARS) method for nondestructive evaluation of damages in glass fiber reinforced polymers. The innovation of the LARS is the combination of the analysis of the acoustic signals and the force excitation. Generic plates of a standardized material (Vetronit EGS 619) and segments of rotor blades of wind turbines were tested. The generic specimens, 2 and 6mm in thickness, were damaged with various impact energies caused by a spherical impactor with a diameter of 16mm, which generated impact damages ranging from barely visible to clearly visible on the generic specimen as well as on segments of real rotorblades of windturbines. The impacts have been measured to account for damage diameter, form and area, indentation depth and bulge height. In addition, blind holes of different depths have been drilled to assess the depth of penetration of the methods tested. As observed in scientific literature as well as in current research, impact damages exhibit a peanut-shaped damage area when impacted with minimum threshold energy. The current research tested several of the specimens using X-ray computed tomography as a reference measurement. These results were compared to the data obtained by ultrasonic methods, LARS and optical lock-in thermography. Finally, all methods have been applied to evaluate rotor blades of wind turbines. The results are shortly discussed in respect to practical applications and accuracy. Springer Science+Business Media New York, 2015 Ultrasonic testing nationallicence Local acoustic resonance spectroscopy nationallicence Computed tomography nationallicence Impact damage nationallicence Glass fiber reinforced polymers nationallicence Lock-in thermography nationallicence Hornfeck Christoph Neue Materialien Bayreuth GmbH, Gottlieb Keim Straße 60, 95448, Bayreuth, Germany aut Geiss Christian Lehrstuhl für zerstörungsfreie Prüfung, TechnischeUniversitätMünchen, Baumbachstraße7, 81245, Munich, Germany aut Rücker Markus IABG mbH, Tests and Analyses, Einsteinstraße 20, 85521, Ottobrunn, Germany aut Grosse Christian Lehrstuhl für zerstörungsfreie Prüfung, TechnischeUniversitätMünchen, Baumbachstraße7, 81245, Munich, Germany aut Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/2(2015-06-01), 1-14 0195-9298 34:2<1 2015 34 10921 https://doi.org/10.1007/s10921-015-0283-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10921-015-0283-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hornfeck Christoph Neue Materialien Bayreuth GmbH, Gottlieb Keim Straße 60, 95448, Bayreuth, Germany aut NATIONALLICENCE 700 1- Geiss Christian Lehrstuhl für zerstörungsfreie Prüfung, TechnischeUniversitätMünchen, Baumbachstraße7, 81245, Munich, Germany aut NATIONALLICENCE 700 1- Rücker Markus IABG mbH, Tests and Analyses, Einsteinstraße 20, 85521, Ottobrunn, Germany aut NATIONALLICENCE 700 1- Grosse Christian Lehrstuhl für zerstörungsfreie Prüfung, TechnischeUniversitätMünchen, Baumbachstraße7, 81245, Munich, Germany aut NATIONALLICENCE 773 0- Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/2(2015-06-01), 1-14 0195-9298 34:2<1 2015 34 10921