Method for the non-destructive inspection of an organic-matrix composite material
A method for the non-destructive inspection of a part made from an organic-matrix composite material (CMO) includes the steps of: a) carrying out a surface inspection of the part by Fourier transform infrared spectroscopy (FTIS), b) if step a) reveals a defect, carrying out in-depth inspections of the organic-matrix composite material according to two complementary ultrasound techniques.
1. A non-destructive inspection method of an area of an organic-matrix composite material (OMC) part, comprising the steps of:
a) carrying out a surface inspection of said area of the part by means of an infrared Fourier transform spectroscopy (IFTS);
b) if step a) reveals a defect, carrying out in depth inspections of said organic-matrix composite material according to two different ultrasound techniques.
2. The non-destructive inspection method according to claim 1 , wherein for an implementation of step a), several spectra performed in the area inspected are averaged, and when analyzed peaks characterizing a physicochemical aging exceed a predetermined non-conformity threshold (NC 1 ), step b) is carried out.
3. The non-destructive inspection method according to claim 1 , wherein, for an implementation of step b), measurement results given by each ultrasound technique are collected, and when at least one of said measurement results exceeds a predetermined non-conformity threshold (NC 2 , NC 3 ), determining that the area needs to be repaired.
4. The non-destructive inspection method according to claim 3 , wherein the measurement results given by each ultrasound technique are completed with a visual analysis based on a comparative colorimetry of the area inspected.
5. The non-destructive inspection method according to claim 1 , wherein one of the two ultrasound techniques is a measure of an acoustic energy transmitted by surface waves on the area inspected, and the other one of the two ultrasound techniques is a measure of an electromechanical impedance of said area of the organic-matrix composite material.
6. The non-destructive inspection method according to claim 1 , wherein, prior to step b), a pickling of a paint covering a surface of said area is carried out.
7. The non-destructive inspection method according to claim 1 , wherein, the infrared Fourier transform spectroscopy (IFTS) is accompanied by a measure of paint thickness when said area is painted.