title: Thermosonic Chladni figures for defect-selective imaging.
abstract: Thermosonic patterns produced by resonant vibrations of simulated and realistic defects are experimentally observed and compared with conventional vibration Chladni figures. The patterns are interpreted on the basis of hysteretic damping model that accounts for in-plane polarization component of vibrations. The analysis and simulation results show that thermosonic Chladni figures are the patterns of dissipation of vibration energy determined by a square of the in-plane strain developed in the resonant vibrations. The difference in nodal patterns between the two types of Chladni figures is due to additional extension-compression of the material mainly in near boundary area. The contribution of various order resonance modes in single-frequency imaging is illustrated and their superposition is shown to produce a full-scale thermosonic image of a resonant defect in a wideband excitation mode.
authors.affiliation: University of Stuttgart, Institute of Polymer Technology (IKT), 70569 Stuttgart, Germany.
authors.forename: Igor
authors.initials: I
authors.lastname: Solodov
authors.affiliation: National Research Tomsk Polytechnic University, 634028 Tomsk, Russian Federation.
authors.forename: Daria
authors.initials: D
authors.lastname: Derusova
authors.affiliation: University of Stuttgart, Institute of Polymer Technology (IKT), 70569 Stuttgart, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Rahammer
keywords: Defect-selective imaging; Thermosonic NDT; Ultrasonic heat generation