1. Finite element modeling of the temperature rise due to the propagation of ultrasonic waves in viscoelastic materials and experimental validation.
- Author
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Hosten, B., Bacon, C., and Biateau, C.
- Subjects
- *
ULTRASONIC waves , *VISCOELASTICITY , *SOUND waves , *ULTRASONICS , *POLYMERS , *FINITE element method - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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