title: Finite element modeling of the temperature rise due to the propagation of ultrasonic waves in viscoelastic materials and experimental validation.
abstract: The ultrasound stimulated thermography method is usually used to detect the temperature rise at a defect position. The temperature rise can be due to the friction between the edges of the defect and/or the plastic deformation around the defect. This paper presents another aspect of the method when the ultrasounds are propagating in a viscoelastic anisotropic material, such as polymers or fiber-reinforced polymers. The attenuation of the waves produces a distributed temperature field. Therefore, even a defect that does not produce some heat can be detected, the ultrasonic field is modified. A finite element model is used for computing the temperature field and for predicting the possibility for an infrared camera of detecting the temperature rise and its modification due to a defect. The model computes the stress and displacement fields associated with the propagation and the loss of energy. Then the heat equation is solved with this loss as a source of heating. An experiment is done with a sonotrode that excites a PVC plate. The ultrasonic displacement at the top of the plate is measured with a laser velocimeter and introduced in the model. Finally, the model result is compared to the image produced by the camera.
authors.affiliation: Laboratoire de Mécanique Physique, Université de Bordeaux, UMR CNRS 5469 351, Cours de la Libération, Talence Cedex, France. b.hosten@lmp.u-bordeaux1.fr
authors.forename: B
authors.initials: B
authors.lastname: Hosten
authors.forename: C
authors.initials: C
authors.lastname: Bacon
authors.forename: C
authors.initials: C
authors.lastname: Biateau
mesh_terms: D016880:Anisotropy; D003198:Computer Simulation; D020342:Finite Element Analysis; D008422:Materials Testing / Q000379:methods*; D008962:Models, Theoretical; D011143:Polyvinyl Chloride; D015203:Reproducibility of Results; D013696:Temperature; D013817:Thermography / Q000379:methods*; D014465:Ultrasonics; D055682:Viscoelastic Substances
chemical_list: D055682:Viscoelastic Substances; D011143:Polyvinyl Chloride