Progress & Achievements

October 2015 (M6)

January 2016 (M9)

July 2016 (M15)

October 2016 (M18)

January 2017 (M21)

July 2017 (M27)

January 2018 (M33)

Click on the months above in order to view the targeted and achieved milestones

Latest activities

Conventional ultrasonic testing of samples is being realized in order to control the sample quality by checking the absence of defects. All samples with single contamination which were characterized with ultrasonic testing were later distributed among partners.

A series of experiments were realized for adhesive bondline quality assurance, including Contact Acoustic Nonlinearity-CAN, Nonlinear Resonant Spectroscopy-NRUS, Local Defect Resonance-LDR (in order to detect weak bonds), µ-Computed Tomography measurements, electromechanical impedance method (EMI) and LAser Shock Adhesion Test (LASAT).

At the same time, a portable prototype device capable of performing inductive measurements was developed. Moreover, a four point bending machine was adapted for testing of the coupons, in order to create the strain field for the inspection. Furthermore, a sensing patch consisting of magnetostrictive wires in the form of ribbons was developed.

The measurement of strength of the rest of contaminated bonded joints by conducting mode I and mode II fracture toughness tests has been completed. The experimental results reveal the detrimental effect of the pre-bond contamination on the bondline performance. Additionally, the procedure for the after-bond ageing has been initiated in order to measure the effect after-bond of combined moisture and temperature on the adhesive bond integrity.

During the last months, the tasks of the characterization of bonded samples by reference methods and the mechanical testing of the samples have been continued. More specifically, in frame of WP2, Airbus Group Innovations has to perform conventional ultrasonic testing of the WP4 samples. Objective is to control the sample quality by checking the absence of defects. Moreover, weak bond should not be detected by conventional NDT to be considered as weak bonds.

This task has been continued these last months by testing the newly produced samples, namely IP-RA+FP series. Samples were inspected with two different probes (5MHz, 64 elements, pitch 1mm and 10MHz, 64 elements, pitch 0.5 mm), like for the previous series. Ultrasound characterizations are available for all the partners.

So far, inspections did not reveal any defect, but analysis should be push forward before stating. Full analysis of the ultrasounds data (all samples taken into account) has been started, for the next WP2 deliverable. The combined scenarios for repair applications remain to be tested in the weeks to come. Once done, the “coupons” phase will be over as ultrasounds inspection is concerned.

The measurement of strength of the rest of contaminated bonded joints by conducting mode I and mode II fracture toughness tests was been carried on and completed. The experimental results reveal the detrimental effect of the pre-bond contamination on the bondline performance. Additionally, the procedure for the after-bond ageing has been initiated in order to measure the effect after-bond of combined moisture and temperature on the adhesive bond integrity.

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

During the reporting period all samples with single contamination were distributed among WP4 partners after they were characterized with the reference method – the ultrasonic testing. Within the reporting period CEA experimented with nonlinear approach to ultrasonic NDT in terms of three techniques (Contact Acoustic Nonlinearity-CAN, Nonlinear Resonant Spectroscopy-NRUS, Local Defect Resonance-LDR) to detect weak bonds.

These experiments are still ongoing. AIG-G performed µ-Computed Tomography measurements. These 3D information can be used to asses if porosity is occurring at the bond line. The tests are done and the evaluation is in progress. GMI developed a portable prototype device, capable of performing inductive measurements.

Moreover, a four point bending machine was adapted for testing of the coupons, to create the strain field for the inspection. Also a sensing patch was manufactured that consists magnetostrictive wires in the form of ribbons. Promising results have been obtained by CNRS during a previous LASAT (LAser Shock Adhesion Test) campaign, allowing us to improve the robustness of the technology.

All the samples will be tested in September during another campaign, in order to show the capabilities of the technique. IMP-PAN tested the production scenario samples (contamination: release agent, moisture, finger print) and the repair scenario samples (de-icer contamination, thermal degradation, faulty curing) with electromechanical impedance method (EMI). Data processing is ongoing.

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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