M7-M12 Progress

Project progress, April 2016 (M12)

During the second semester of the project, the first reference samples for the production and repair scenarios were prepared. These will be used for comparison against all other respective samples.

The contaminated samples for the production scenarios were comprised of release agent (RA), fingerprint (FP) and moisture (MO) contaminated samples with three levels of intensity each, whereas the repair scenario examines samples contaminated with de-icer (DI) and fingerprints (FP), thermally degraded (TD) samples and faulty cured (FC) samples.

ENDT techniques for surface quality assurance (Laser Induced Breakdown Spectroscopy (LIBS), Optically Stimulated Electron Emission (OSEE), Full Field Vibrometry, Electronic Nose (E-NOSE), Aerosol-Wetting-Test BoNDTinspect, FTIR-Spectroscopy) were tested, matured and improved by adaptation, against their sensitivity to detect physico-chemical properties of the adhered surfaces caring with multiple contaminations, and on the possibility to quantify the measuring results.

Adhesively bonded samples for the cases of faulty curing and thermal degradation contaminants have been characterized by means of conventional ultrasonic NDT testing, in order to control the sample quality by checking the absence of defects. These will be afterwards inspected by different methods for NDT of bonded structures (Shock Wave Adhesion Test, Electromechanical Impedance, Linear and Non-linear Ultrasound and Magnetostrictive Sensors).

Meanwhile, the first mechanical tests (Mode I and Mode II fracture toughness) were conducted at the reference samples and the samples with faulty curing of the adhesive presented a loss of the bonded joint quality.

Lead by: GMI. Read the WP2 description here

Sample preparation: Test samples for production were manufactured and prepared for the following contamination scenarios: reference samples, moisture uptake, fingerprint, release agent (RE, MO, FP, RA) for WP2, WP3 and WP4 as well as the samples for repair (RE, thermal degradation TD, de-icing fluid DI, FP) for WP2 and WP3. For WP4 RE, TD, DI and faulty curing (FC3) are finished.

Characterization of bonded samples by reference methods: Characterization of bonded samples by reference methods.

Measurement of strength of bonded samples by mechanical tests: Additionally, the first mechanical tests (Mode I and Mode II fracture toughness) were conducted at the reference samples and the samples with faulty curing of the adhesive showing a loss of the bonded joint quality.

Lead by: AGI-G. Read the WP3 description here

WP3 focuses on the testing, maturation and improvement of ENDT techiques by adaptation, examining their sensitivity to detect physico-chemical properties of the adhered surfaces with multiple contaminations and the possibility to quantify the measuring results.

The WP3 activities started in November 2015; officially the kickoff was the WebEx meeting on 19th November 2015. The samples characteristics requested for each ENDT technology, as well as the test scenarios (test coupons/pilot samples and multiple contaminations) were discussed with the respective partners.

Fraunhofer IFAM prepared the samples accordingly and sent them to the respective partners for performing the ENDT tests: Laser Induced Breakdown Spectroscopy (LIBS), Optically Stimulated Electron Emission (OSEE), Full Field Vibrometry, Electronic Nose (E-NOSE), Aerosol-Wetting-Test BoNDTinspect, FTIR-Spectroscopy.

Lead by: AGI-G. Read the WP3 description here

Samples for inspection with bondline ENDT (extended nondestructive testing) methods were prepared for the WP4 partners. Three reference samples (symbol: RE) were prepared for the production scenarios and three for the repair scenarios. All other respective samples will be compared against these reference samples.

The samples for the production scenarios comprised of release agent (RA) contaminated samples with three levels of intensity. The repair scenario samples comprised of samples contaminated with de-icer (DI), thermally degraded (TD) samples and faulty cured (FC) samples. There are three intensities for the DI and TD samples, and the lowest intensity for the FC samples. For each intensity there were three samples, resulting in a total of 36 samples for inspection.

After discussion, it was decided that before starting the tests with ENDT methods the samples should undergo conventional NDT testing. Such approach should help to interpret result obtained by the ENDT methods. In order to perform conventional NDT testing the samples were sent to AIRBUS (France) in Toulouse, where they were tested with ultrasonic in a water tank. Currently the samples are being tested with ENDT methods at the WP4 partners’ laboratories.

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 636494.

This project is endorsed by the European Aeronautics Science Network - EASN.

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