Stress Change Detection from Application of a Stretching Model to Coda Wave Measurements

摘要

The heterogeneities contained in concrete will cause strongly multiple scattering behaviors during the propagationof ultrasonic waves, forming the so-called coda waves. External loads will slightly change concrete structural size andfurther introduce stretching effects on coda waveforms. In this paper, coda waves are collected from several concretesamples under different loads, and the waveform variations are quantified through a stretching technique. The resultsshow that their stretching ratios are varied according to external load strengths, which implies that stress changes inconcrete can be detected by coda wave measurements. The presented study could be very value for nondestructivetesting of concrete structures.