Issues relating to the quality and safety of materials and structures have grown tremendously in an increasingly demanding world. In order to meet these strategic challenges, ultrasonic non-destructive testing (NDT) techniques have evolved and adapted to detect manufacturing or operational flaws within a variety of structures in such diverse fields as aeronautics, civil engineering, the nuclear industry, etc. To increase detection sensitivity in the early stages of damage, a new generation of ultrasonic end non-linear acoustic methods has recently emerged to control the health status of a range of materials : from polymer matrix composites tometallic structures, civil engineering concrete, thin films, etc. Over the past 30 years, theoretical and experimental developments in non-linear acoustical methods have allowed a sufficient understanding level to consider a technology transfer. Thus, with the variety of indicators based on time and frequency signatures and associated to the early detection of local and/or widespread damage, non-linear acoustic methods can detect defects of a smaller size than the acoustic wavelengths involved.
Theoretical content :
M.BENTAHAR - Senior Lecturer/Researcher (LAUM / ENSIM)
V.TOURNAT - Research Director CNRS
Experimental content :
S.LETOURNEUR - Research Engineer CNRS
C.MECHRI - Lecturer/Researcher (LAUM / CTTM)
Mr CHEKROUNE - Lecturer/Researcher (LAUM / IUT)
