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| Numerical Simulation and Verification of Magnetic Memory Stress Detection in Ductile Iron Pipeline |
| Received:February 18, 2024 Revised:March 18, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.08.019 |
| KeyWord:ductile iron pipeline stress detection magnetic memory numerical research finite element simulation magnetic signal |
| Author | Institution |
| FAN Xiangfeng |
School of Information Science and Engineering, Shenyang University of Technology, Shenyang , China;China Institute of Atomic Energy CIAE, Beijing , China |
| YANG Lijian |
School of Information Science and Engineering, Shenyang University of Technology, Shenyang , China |
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| Abstract: |
| Aiming at the lack of study on magnetic memory stress testing method, the work aims to develop a new method for ductile iron pipelines and verify its reasonableness. Based on analytical calculations and finite element simulation, a magnetic memory stress testing model for ductile iron pipelines was developed. The influence of stress values and sensor lift-off on the magnetic memory signal of the ductile iron pipelines was studied, and the model was verified by constructing an experimental platform for magnetic memory stress testing of ductile iron pipelines. The results indicated that the axial peak and the radial zero-point positions did not shift with stress change, while the signal strength varied linearly with the increase of stress. The magnetic memory signal of the ductile iron pipelines exponentially decayed with the increase in lift-off. Within the range of 2.5 to 4 mm, the decay was approximately linear with minimal signal fluctuation, which was suitable for signal acquisition. The results from both methods are in good agreement. The outcomes from the magnetic memory stress testing experimental platform align well with the mathematical simulation calculations, validating the numerical rationality of the two magnetic memory stress testing models established based on analytical calculations and finite element simulation. |
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