Mohammadi Ouaftouh

TL;DR: In this paper, the surface residual stresses in steel rods made of the same material but with different heat treatments have been studied from Rayleigh wave velocity measurements using the laser ultrasonics technique and piezoelectric transducers.

TL;DR: In this article, an ultrasonic measurement method allowing us to inspect the corroded thickness of plates using Lamb waves is described, which consists of measuring the group velocity of the S0 mode and then observing variations in velocity due to successive chemical attacks.

TL;DR: In this paper, the authors present a method based on the measurement of ultrasonic Rayleigh wave velocity variations versus the stress state in the thickness of sheets, and show some residual stress profiles obtained by this method.

TL;DR: Rayleigh wave (RW) acousto-elastic coefficients of an orthotropic material are theoretically determined according to its characteristics, i.e. the density and the second and third-order elastic constants, which allows on the one hand to check the theoretical development and on the other hand to show that it is possible to calculate acoustic coefficients theoretically from intrinsic characteristics of the material rather than measuring them directly during a calibration phase which is sometimes long and difficult to realize.

TL;DR: A non-destructive method for the determination of residual stress profiles as a function of depth in laminated aluminium alloy sheets using an ultrasonic method using Rayleigh waves propagating along the sides of the sheet is presented.