Structural damage identification in plates via nonlinear structural intensity maps.
A nonlinear structural intensity concept is presented as an approach for the identification of defects displaying nonlinear vibration behavior. The nonlinear structural dynamic response exhibited by a riveted joint with loosened fasteners connecting a stiffener with a flat panel is investigated. The excitation, generating elastic waves with dominant bending components, triggers the nonlinear contact between the plate and the stiffener inducing a dynamic response rich with nonlinear harmonics. Experimental structural intensity maps are evaluated at the super-harmonic frequencies. This technique provides an experimental approach for the characterization and two dimensional visualization of nonlinear types of defects.
Department of Aerospace Engineering, The Pennsylvania State University, State College, Pennsylvania 16802, USA. fus119@psu.edu
Fabio
F
Semperlotti
Stephen C
SC
Conlon