Abstract
An NDE method based on a modification of the HF impedance measured with an integrated piezoelectric actuator-sensor has been successfully demonstrated. An important characteristic of this NDE technique is the localized sensing area due to energy dissipation. This paper presents an analytical method to determine the energy dissipated through joints at HF and its relation to the localized actuation-sensing region. The structure used for this analysis consists of two beams connected with a bolted joint and having free-free boundary conditions. Due to the HF range employed, theoretical assessments are made using a wave propagation approach. For the same reason, the Timoshenko beam theory is used to model the structure. Using the equations of motion, the dynamic stiffness matrix is assembled in the frequency domain. Then, the energy dissipated in the joint is modeled linearly using spring dash-pot systems and nonlinearly using nonconservative friction clearance systems. This work is the first effort in the HF modeling of structural joints. (Author)
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