Determination of stresses in aluminium alloy using optical detection of Rayleigh waves

• Published in: Ultrasonics Vol. 37; no. 5; pp. 365 - 372
• Main Authors: Duqennoy, M., Ouaftouh, M., Ourak, M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.06.1999; Elsevier Science; Elsevier
• Subjects: Acoustical measurements and instrumentation; Acoustics; Acousto-elasticity; Analysing. Testing. Standards; Applied sciences; Cross-disciplinary physics: materials science; rheology; Engineering Sciences; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Materials science; Materials testing; Measurement and testing methods; Measurement methods and techniques in continuum mechanics of solids; Metals. Metallurgy; Nondestructive testing; Nondestructive testing: ultrasonic testing, photoacoustic testing; Optical detection; Physics; Rayleigh wave; Residual stress; Solid mechanics; Structural and continuum mechanics; Testing for defects; Optical detection; Rayleigh wave; Acousto-elasticity; Residual stress; Phase grating; Acoustic measurement; Propagation velocity; Wave detection; Surface wave; Aluminium alloy; Experimental study; Optoacoustic effect; Acoustooptical effect; Internal stress; Ultrasonic control; Sheet metal; Laser; Testing equipment; Gratings; Non destructive test; Stress measurement
• ISSN: 0041-624X; 1874-9968
• DOI: 10.1016/S0041-624X(99)00009-8

In this paper, a non-destructive method for the determination of residual stress profiles as a function of depth in laminated aluminium alloy sheets is presented. An ultrasonic method using Rayleigh waves propagating along the sides of the sheet is proposed. The determination of residual stresses is based on the measurement of the relative variation of the ultrasonic wave velocity versus the depth. An experimental device, using the acousto-optic interaction, has been developed to measure the velocity of the Rayleigh wave. Several residual stress profiles obtained by this technique are shown. The latter are compared to other stress profiles obtained by other methods: layer removal method and acoustic detection using wedge transducer.