Monitoring of Concrete Components Structure Condition Using a Nonlinear Ultrasonic Spectroscopy
Nonlinear ultrasonic spectroscopy methods appear to rank among highly promising methods to identify the structure defects in a wide range of materials. These methods are employing the fact that a crack-induced nonlinearity makes an extremely sensitive material impairment indicator.The paper deals with nonlinear interaction between elastic wave and structural defects in concrete materials. First, the short summary and comparison of various methods of nonlinear ultrasound spectroscopy is shown. Method with one pure harmonic exciting signal which uses the analysis of response frequency spectrum generated from a continuous wave transmission through the sample structure was chosen. In the first stage of the experiment, we have examined whether or not the inhomogeneous concrete material gives rise to parasitic components being able to generate non-linear phenomena in the signal transmission. In the second stage were measured the specimens with structure damaged by the pressing machine and a correlation between the response frequency spectrum and the specimen structure deterioration was looked for.The results showed that the effect of a concrete material inhomogeneity was very low in the case of nonlinear ultrasonic spectroscopy, its nonlinear effect being substantially lower than in cases of common defects. In the second stage was also verified that the transfer functions of degraded specimen correlated fairly with the material structure defects.
Nonlinear spectroscopy elastic wave concrete structure integrity frequency spectrum.
Marta KORENSKA Michal MATYSIK Iveta PLSKOVA Monika MANYCHOVA
BUT, Faculty of Civil Engineering, Physics Department, Brno, Czech Republic BUT, Faculty of Civil Engineering, Department of Building Structures, Brno, CZ
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
2438-2443
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）