Transient modeling of ultrasonic guided waves in circular viscoelastic waveguides for inverse material characterization

摘要: In this contribution, we present an efficient approach for the transient and time-causal modeling of guided waves in viscoelastic cylindrical waveguides context ultrasonic material characterization. We use scaled boundary finite element method (SBFEM) computation phase velocity dispersion. Regarding behavior materials under consideration, propose a decomposition that considers real-valued frequency dependence (visco-)elastic moduli and, separately, their attenuation. The modal expansion is utilized to take transmitting receiving transducers into account propagate excited waveguide modes through length. effectiveness proposed simulation model shown by comparison with standard FEM as well results based on exact solution complex-valued wave problem. Two models are discussed, namely fractional Zener anti-Zener model; re-interpret latter terms Rayleigh damping model. Measurements taken polypropylene sample used inverse extracted properties may then be computer-aided design systems.