Dynamic acousto-elastic test using continuous probe wave and transient vibration to investigate material nonlinearity

Jesus Eiras Fernandez (1) , Q.A. Vu (2) , Martin Lott (2) , Jordy Paya (1) , Vincent Garnier (2) , Cedric Payan (3)

1 UPV - Universitat Politècnica de València = Universitad Politecnica de Valencia = Polytechnic University of Valencia
2 LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]
3 O&I - Ondes et Imagerie

This study demonstrates the feasibility of the dynamic acousto-elastic effect of a continuous high frequency wave for investigating the material nonlinearity upon transient vibration. The approach is demonstrated on a concrete sample measuring 15 × 15 × 60 cm3. Two ultrasonic transducers (emitter and receiver) are placed at its middle span. A continuous high frequency wave of 500 kHz propagates through the material and is modulated with a hammer blow. The position of the hammer blow on the sample is configured to promote the first bending mode of vibration. The use of a continuous wave allows discrete time extraction of the nonlinear behavior by a short-time Fourier transform approach, through the simultaneous comparison of a reference non-modulated signal and an impact-modulated signal. The hammer blow results in phase shifts and variations of signal amplitude between reference and perturbed signals, which are driven by the resonant frequency of the sample. Finally, a comprehensive analysis of the relaxation mechanisms (modulus and attenuation recovery) is conducted to untangle the coupled fast and slow hysteretic effects.

Domaines: Mécanique [physics.med-ph]

Jesus Eiras Fernandez, Q.A. Vu, Martin Lott, Jordy Paya, Vincent Garnier, et al.. Dynamic acousto-elastic test using continuous probe wave and transient vibration to investigate material nonlinearity. Ultrasonics, 2016, ⟨10.1016/j.ultras.2016.03.008⟩. ⟨hal-01291010⟩