SYSTEM AND METHOD FOR WARNING OF FATIGUE CRACK FAILURE BASED ON NONLINEAR ULTRASONIC MODULATION AND SYSTEM AND METHOD FOR ESTIMATING RESIDUAL LIFE OF STRUCTURE USING THE SAME

摘要

A system and method for estimating residual fatigue life of structures based on nonlinear ultrasonic modulation that can provide warning of impending damage to structures when structures with fatigue cracks are subjected to a constant amplitude periodic load and estimate the residual fatigue life of structures. Is suggested. A fatigue crack damage warning system based on nonlinear ultrasonic modulation includes: a first piezoelectric element installed in a first area of a target structure; A second piezoelectric element installed in the second area of the structure; A third piezoelectric element installed in a third area of the structure; A first waveform generator for providing a low-frequency ultrasonic input signal to the first piezoelectric element; A second waveform generator for providing a high frequency ultrasonic input signal to the second piezoelectric element; A digitizer for receiving a detection signal provided from the third piezoelectric element; And a controller for controlling the operation of the first waveform generator and the second waveform generator, checking the growth of fatigue cracks of the structure based on a detection signal provided from the digitizer, and warning of damage.