Estimation of the State of Rod Structural Elements Based on Recording of Deformation Responses to Serial Impact Excitations

摘要

Based on the example of welded and one-piece-cut steel (Steel 10) frame triangular ele-ments (4 × 8 × 245 mm) using the methods of thermal unloading up to the temperature T_(max) = 625℃, serial impact testing of parent (stressed) and unloaded elements, and comparative analysis of Fourier images of deformation responses with respect to unloaded elements, it was found that a nonlinear region of the Fourier image degenerates into a linear one and the maximum of the linear regions of the Fourier image shifts up to 2 Hz. The dynamic deformation responses of the elements were recorded using superbroadband (from 10–2 to 108 Hz) ferroelectric microsensors based on thin Pb(Zr_(0.53)Ti_(0.47))O_3 films with a thickness of ～2.0 μm with a 0.8 mm~2 contact pad. The results can pro-vide a the signal for distinguishing stressed states of structures and their elements.