Research on crack detection of steel plate by permeability testing technology
International Journal of Development Research
Research on crack detection of steel plate by permeability testing technology
Received 02nd April, 2019; Received in revised form 11th May, 2019; Accepted 21st June, 2019; Published online 31st July, 2019
Copyright © 2019, Ling-hui ZHENG et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The permeability testing technology is an evaluating method of microstructure changes such as stress concentration and fatigue damage by measuring the change of permeability. In order to explore its ability to detect macroscopic crack defects, a testing platform for permeability was designed, and a physical model of permeability testing crack have been built. Then use the testing platform to detect 45# steel plate which contain artificial cracks from front-side and back-side of it, and the relationship between detection signal and the excitation voltage amplitude was studied. At same time explored the signal characteristics of different detection directions of sensors. The study shows that the sensor has a high signal/noise ratio under the excitation voltage of 5Vpp. The permeability testing method can detect the front-side and back-side crack of the steel plate. When detecting the back-side of the steel plate, the crack at the surface thickness of 2.5 mm can be detected. The research results expand the application field of permeability detection technology and provide a new method for the front-side and back-side detection of steel plate cracks.
