Research On Ultrasonic Guided Waves Inspection For Angle Steel Type Material Of Electric Iron Tower

Angle steel type material of electric iron tower is the substrate for constituted electric iron tower. Widely used in the power system. Most of the electric iron tower erected in the wild, influenced by the environment. Angle steel type material easily generated corrosion damage. Due to the large amount of angle steel type material for electric iron tower and the heavy workload of detection. Using traditional NDT detection methods, detection efficiency is very low, it is difficult to meet the actual project needs. how to detection angle steel type material rapid and effective, and how to detect the inserted concrete slab foundations angle steel type materialof corrosion damage has been concern for the power industry. Compared with the traditional method of ultrasonic testing, guided wave detection method has an characteristic of explosive, long-distance propagation, the large range of detection. Research on guide wave propagation characteristics for angle steel type material and the scattering characteristics for the defect, Has an important significance for the rapid detection of damage in angle steel type material corrosion defects.In this paper, combining the finite element numerical simulation and experimental test method under the guidance of the elastic wave theory. Conduct propagation of angle steel type material and consolidation in the concrete of electric iron tower for guided waves and detection of corrosion defects. First, using the finite element software of ABAQUS numerical the model of angle steel type material,Because of the angle steel type material is composition by two vertical narrow-angle plates, therefore based on the dispersion curves and structure features of Lamb waves.Select excitation0 A mode Lamb waves as the detection mode wave. Finite element simulation of wave field snapshots and time-domain response echoes show that, since the present study was a cross-sectional angle of shape “L” solid acoustic waveguide,On the angle steel type material, the guided wave excited by0 A mode Lamb waves propagation along the forward. sound field coverage the angle steel type material and the connecting area, guided wave excited by0 A mode Lamb waves, After the propagation distance exhibit characteristic propagation characteristics, the dispersion curves is different from Lamb waves. In this study, we called it0 A mode guide waves.Secondly, establishment a free state of angle steel type material for three-dimensional model, study of the spontaneous self-closing single probe and dual probe pitch-catch mode for detection angle steel type material in different locations,different depth of corrosion defects research. Finite element simulation results show that self-closing single probe detection method is better than the pitch-catch detection method. The defect in angle steel can be detected more easily than in the connecting area of angle steel type material. In order to detect the corrosion defects in the angle insert concrete of electric iron tower. Basis of a free state angle finite element model built a mode of angle steel type material contact with concrete structures. Studying the corrosion defects of grooves, cracks and plate thickness reduction in different positions and sizes, Echo time-domain response of0 A mode guided wave testing.this lay the foundation for detection experiments.Finally, conducted research of guided waves experiments of the free state of angle steel type material and fixed by concrete mode. Design a micelles probe of guide waves and the center frequency is 120 kHz. Excitation similar guide waves of0 A mode for experimental testing research. The results show that corrosion defect in edge and the connecting area of angle steel type material was significantly, consistent with the numerical results. Select the angle steel type material with corrosion defect of groove and fracture, pouring of concrete as a mold making structural model through PVC pipe. Detection the corrosion defects of it has effect to achieve the desired goals.It demonstrates the feasibility of ultrasonic guided waves can be used for fast detection of angle steel type material of electric iron tower. Ultrasonic guided waves detection technology research in this paper is provide a meaningful reference for angle steel type material of electric iron tower.