Permanent Magnet Excitation Stress Detection Methode Device

In this paper, the stress concentration region the magnetic field detection technology for the early detection of ferromagnetic materials are studied in magnetic field detection method for stress concentration region, the regional metal materials, the presence of stress concentration on the magnetic signals, through a series of theoretical research, simulation analysis and experimental summary, the detection method for a detailed theoretical analysis and summary of.Study is based on theory and magnetic flux leakage testing of ferromagnetic materials based on inverse magnetostriction effect, of magnetic flux leakage detection test in the pipeline in the area of stress concentration factors obtained excitation pole position, was detected with the magnetic poles of the magnetic tube distance Detection of stress concentration factors have an important impact area, and the analysis of finite element simulation based on the theory, and leakage through the pipe surface magnetic field finite element simulation, analysis and detection target surface, the changes in magnetic flux leakage signal, and to study the stress concentration areas on the magnetic flux leakage signal characteristics, the impact of changes in the magnetic signal obtained under the applied magnetic field using magnetic flux leakage Detection of stress concentration region, the surface of ferromagnetic materials detection of stress concentration zone magnetic signal changes. Experiments verify the theoretical analysis using the correctness of the plate for the detection of objects in different environments for testing, test plate surface through the Hall sensor magnetic signal, detection of data transmission through the UA301 data acquisition card to the computer, storage and computing, and analysis of experimental data to prove that magnetic flux leakage testing method to meet the qualitative requirements, and the different effects of magnetic surface from the height of the different changes in the magnetic signal. The results show that the magnetic flux leakage experiments focused on the surface stress of ferromagnetic materials changes in the regional magnetic signal to verify the existence of stress concentration caused by changes in the magnetic signal.Subjects completed the testing of permanent magnet excitation region of stress concentration detection method, the finite element method for simulation analysis and experimental verification of stress concentration region the feasibility of detection obtained magnetic flux leakage testing method can detect metal stress concentration zone of stress, as stress concentration region of ferromagnetic materials, the means of detection. Further improve the magnetic flux leakage testing of ferromagnetic materials, the stress concentration theory and practical applications.