Jacob, Xavier (2005) Application of elastic waves interaction to the measurement of nonlinear properties of materials and to high-pressure wave fields characterization. PhD thesis Acoustique Physique, Laboratoire Ondes et Acoustique, ESPCI.
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Abstract
This work presents a study of nonlinear elastic waves interaction, and different experimental techniques devoted to nonlinear properties measurement and high-pressure wave fields characterization.
The study develops an analogy between fluids and solids within quadratic approximation, i.e. valid for longitudinal waves. The interaction of two longitudinal waves (30 and 2.5 MHz), equivalent to a phase modulation, allows to measure the nonlinearity coefficient of different kinds of materials, with samples thickness of order 10 mm. The results obtained in fluids, gels and solids, thanks to electronic improvement, shows the flexibility of this method.
The specific elasticity of soft solids makes it possible to observe harmonic generation and interaction of shear waves, which are characteristic of the cubic nonlinearity and also confirms diffraction and near field effects. This latter are responsible for odd harmonics apparition. The 1D. transient elastography represents an experimental configuration which can be applied.
An optical interferometer was used to measure high-pressure wave fields (at the focus of high-power transducers), and very small displacements (resulting from the radiation stress at the surface of a solid sample). The bandwidth broadening of optical setup and the improvement of phase detection methods make it possible to perform quantitative studies of nonlinear propagation phenomenon.
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Royer, Daniel |
| Date: | June 2005 |
| Board of examiners: | Gusev, Vutalyi and Bou matar-lacaze, Olivier and Coulouvrat, François and Cathignol, Dominique and Barriere, Christophe and Royer, Daniel |
| Ecole Doctorale: | ED 404 PHYSIQUE MACROSCOPIQUE |
| Discipline: | Acoustique Physique |
| Collection (Fonds): | ESPCI |
| Institution: | ESPCI |
| Department: | Laboratoire Ondes et Acoustique |
| Subjects: | 4. Materials Science, Mechanics and Mechanical Engineering 3. Physics, Optics |
| Uncontrolled Keywords: | Ultrasound nonlinear acoustics wave interaction phase modulation nonlinearity parameter transient elastography shocked shear waves optical interferometry high-pressure wavefields radiation stress, Ultrasons acoustique non-linéaire interaction d'ondes modulation de phase coefficients de non-linéarité ondes de choc de cisaillement élastographie impulsionnelle interférométrie laser fortes pressions acoustiques contrainte de radiation |
| ID Code: | 1301 |
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| Deposited By: | Xavier JACOB |
| Deposited On: | 05 September 2005 |
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