GUIDED WAVE PROPAGATION ON LOADED PLATE
Keywords:
Guided wave propagation, loaded plate, symmetrical, asymmetrical, wave’s velocityAbstract
During in-situ monitoring, structures are exposed to load changes which may mask the damage-induced signal or produced false alarm unless compensation is performed. Studies on guided wave propagation due to symmetrical load have been done by previous researchers, so this research is concentrated on asymmetrical load applied to infinite, thin aluminium plate with thickness of 1mm using Abaqus done in two-dimensional mesh. There is no analytical solution for loaded plate so dispersion curve provided by semianalytical finite element (SAFE) method is used for verification purpose. Excitation force is set to 100kHz due to effects of load only occurred at low frequency region. Wave propagation’s speed is increased with increases of strain values applied on plate under extensional because stiffness of plate also increased but this condition didn’t work for plate under bending. Results of Abaqus in space-time domain able to provide obvious difference between various load applied on plate but not 2D FFT curves. Center frequency of excitation force cannot set lower which is the limitation of this finite element method.References
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