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Journal of Applied Mechanics and Technical Physics

2013 year, number 2

Experimental Validation of the Spectral Criterion for the Diagnosis of Periodic Rod Structures using Ferroelectric Strain Gauges

Yu. V. Esipov
Keywords: complex structures, stress indices, strain oscillations, Fourier transform, nonlinear dynamics, ferroelectric gauges
Pages: 331-336


Successive impact excitation and construction of Fourier transforms of linear and nonlinear strain responses and phase portraits of undamaged or damaged vertically suspended models of a periodic welded rod structure were used to establish the dependence of the area ratio of the phase portraits of the nonlinear and linear domains of the strain response, which characterizes the stress (damage) of the model, on the impact momentum. The dynamic strain responses were recorded using ultra-wideband (102÷108 Hz) ferroelectric microgauges based on thin Pb(Zr0.53Ti0.47)O3 films 2 mm in thickness with a 0.8 mm2 contact area.