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NDT.net Issue - 2019-03 - Articles
NDT.net Issue: 2019-03
Publication: 10th International Symposium on NDT in Aerospace, Oct 2018, Dresden, Germany (AeroNDT 2018)
Session: Ultrasonics 1
ARTICLE

Detection of delamination and impact damage in multilayered lightweight materials

Tobias Gautzsch14, Andreas Bodi110, Manuel Lucas23, Ralf Steinhausen313, Mario Kiel312
1SONOTEC GmbH58, Halle, Germany
2SONOTEC US Inc., Islandia, NY, USA
3Forschungszentrum Ultraschall Halle gGmbH15, Halle, Germany

Abstract: A variety of lightweight composite materials are used in aerospace construction. Most common are multiple layers of aluminum with adhesive interfaces of different thicknesses, GFRP sandwich structures with and without honeycomb cores and glass fiber reinforced aluminum. The material properties of all materials are highly dependent on the integrity of all adhesive and matrix structures. These can be impaired by impacts, production problems, physical stress or aging. Air-coupled ultrasonic testing (ACUT) can be a method for non-destructive quality control for semi-finished composite materials as well as products. Additionally, it can be applied for maintenance testing of parts to find impact and stress damage. We will present a case study on the detection, measurement and evaluation of delamination in multi-layered aluminum bonds with up to 4 sheets of aluminum in various thicknesses. The aviation-specific specimen is measured in through-transmission with ACU with multiple frequencies, filters and averages with classic piezocomposite as well as phased-array ACU transducers. Delamination and flaws can be found in every adhesive layer. Depending on the composite thickness, different frequencies have to be applied.


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