Acousto-mechanical evaluation of multiscale hysteretic parameters of complex material with nonlinear time reversal imaging

Dos Santos, Serge; Institut National des Sciences Appliquees Centre Val de Loire; France

Dos Santos, S.; INSA Centre Val de Loire; France
Arruga, D.; INSA Centre Val de Loire; France
Lints, M.; Tallinn University of Technology; Estonia
Salupere, A.; Tallinn University of Technology; France

ID: ECNDT-0545-2018
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Session: Nonlinear Ultrasonics 2
Room: G2
Date: 2018-06-12
Time: 13:50 - 14:10

Nonlinear acoustics and vibration has become increasingly important during the last forty years due to the increase of higher sensitivity of electronic instrumentation and its associate signal processing algorithm. The nonlinearity of materials results in nonlinear effects, which arise from defects in the materials present at all scales[1,2]. Applications include nonlinear nondestructive testing (NDT), harmonic medical ultrasound imaging and development of new materials such as nanocomposite and memory based materials[3]. One of the strategic plan of the international NDT community is to define standards for developing nonlinear non-destructive testing for automated set-up in mass production.
The aim of this paper is to present an acousto-mechanical based experiment using the Nonlinear Time Reversal signal processing tool known to extract, in a complex medium, sources of multiscale nonlinearity potentially responsible of degradation processes. The paper presents the TR-NEWS device which is associated to the development of a phenomenological characterization of material local elastic properties[2] working at 50 MHz allowing the measurements of degradation and aging of complex structures (Figure 1). The experimental device was tested with the V3 calibration block, improved and specially scaled in order to access to a wide range of parameters: mechanical properties, ultrasonic parameters (celerity and attenuation) and local geometric data. Tested for biomedical applications too, the well-known complexity constitutes a strong advantage for the TR-NEWS efficiency. Linear and nonlinear behavior of elasticity is measured locally thanks to a mechanical loading conducted with a Instron loading machine specifically optimized for biomaterials. Various materials have been tested for the validation of concept (such as polymers, multiscale elastic layer in contact on complex reverberant bio-materials) before applications.
[1] Lints et al., Wave Motion, 71, 101-112, (2017)
[2] Le Bas et al., Proc of the 6th ECNDT (2006)
[3] Dos Santos et al, IEEE IUS, Tours (2016)