Article Article
Application of Metal Magnetic Memory Testing for Quantitative Evaluation of Stress Concentration in Ferromagnetic Steels

The objective of this research is to develop a quantitative algorithm between the magnetic parameter bm and the stress concentration factor in ferromagnetic steels. Specimens of U71Mn steel were machined into smooth plates with artificial defects (circular holes and rectangular holes) to represent various stress concentration degrees. Variations of the magnetic parameter bm with the stress concentration factor and the defect area were studied, respectively. The magnetic parameter bm of the U71Mn steel specimen was compared with that of the X80 steel specimen. Quantitative correlations of the magnetic parameter bm with the stress concentration factor and the defect area were investigated. The results show that the magnetic parameter bm is exponentially varied to the stress concentration factor and the defect area. The quantitative algorithm between the magnetic parameter bm and the stress concentration factor is influenced by the defect shape and the material type. An equation was proposed to evaluate the defect area based on the magnetic parameter bm.



Ariffin, A., M.I.M. Ahmad, S. Abdullah, and W.Z.W. Jusoh, 2015, “Detection of Cracked Position Due to Cyclic Loading for Ferromagnetic Materials Based on Magnetic Memory Method,” Jurnal Teknologi, Vol. 75, No. 7, pp. 67–70,

Bao, S., M.L. Fu, H.J. Lou, S.Z. Bai, and S.N. Hu, 2016, “Evaluation of Stress Concentration of a Lowcarbon Steel Based on Residual Magnetic Field Measurements,” Insight, Vol. 58, No. 12, pp. 678-682,

Bao, S., H. Lou, M. Fu, and Y. Gu, 2017, “Correlation of Stress Concentration Degree with Residual Magnetic Field of Ferromagnetic Steel Subjected to Tensile Stress,” Nondestructive Testing and Evaluation, Vol. 32, No. 3, pp. 255–268,

Dong, L., B. Xu, S. Dong, and Q. Chen, 2010, “Characterisation of Stress Concentration of Ferromagnetic Materials by Metal Magnetic Memory Testing,” Nondestructive Testing Evaluation, Vol. 25, No. 2, pp. 145–151,

Doubov, A.A., 2002, “Express Method of Quality Control of a Spot Resistance Welding with Usage of Metal Magnetic Memory,” Welding in the World, Vol. 46, No. 6, pp. 317–320.

Dubov, A.A., 1997, “A Study of Metal Properties Using the Method of Magnetic Memory,” Metal Science and Heat Treatment, Vol. 39, pp. 401–405,

Dubov, A., A. Dubov, and S. Kolokolnikov, 2014, “Application of the Metal Magnetic Memory Method for Detection of Defects at the Initial Stage of their Development for Prevention of Failures of Power Engineering Welded Steel Structures and Steam Turbine Parts,” Welding in the World, Vol. 58, pp. 225–236,

Fatemi, A., and L. Yang, 1998, “Cumulative Fatigue Damage and Life Prediction Theories: A Survey of the State of the Art for Homogeneous Materials,” International Journal of Fatigue, Vol. 20, No. 1, pp. 9–34,

Gilstad, C.W., M.F. Dersch, and R. Denale, 1990, “Multi-Frequency Eddy Current Testing of Ferromagnetic Welds,” Review of Progress in Quantitative Nondestructive Evaluation, pp. 1363–1370, /978-1-4684-5772-8_175.

Huang, H.H., S. Jiang, R. Liu, Z. Liu, 2014, “Investigation of Magnetic Memory Signals Induced by Dynamic Bending Load in Fatigue Crack Propagation Process of Structural Steel,” Journal of Nondestructive Evaluation, Vol. 33, pp. 407–412,

Huang, S.-L., L.-M. Li, K.-R. Shi, and X.-F. Wang, 2004, “Magnetic Field Properties Caused by Stress Concentration,” Journal of Central South University of Technology, Vol. 11, pp. 23–26, /s11771-004-0005-6.

Kapustin, V.I., T.N. Maksimova, V.G. Staseev, and V.G. Firstov, 2001, “Main Trends of Standardization of the Radiographic Testing Method,” Russian Journal of Nondestructive Testing, Vol. 37, pp. 900–906,

Lovejoy, D., 1993, Magnetic Particle Inspection: A Practical Guide, pp. 385–90, Springer Netherlands.

Shi, C., S. Dong, B. Xu, and P. He. 2010, “Stress Concentration Degree Affects Spontaneous Magnetic Signals of Ferromagnetic Steel Under Dynamic Tension Load,” NDT&E International, Vol. 43, No. 1, pp. 8–12,

Zhang, Y.L., R.B. Gou, J.M. Li, G.T. Shen, and Y.J. Zheng, 2012, “Characteristics of Metal Magnetic Memory Signals of Different Steels in High Cycle Fatigue Tests,” Fatigue & Fracture of Engineering Materials & Structures, Vol. 35, No. 7, pp. 595–605, .1460-2695.2012.01651.x.

Zhong, L., L. Li, and X. Chen, 2010, “Magnetic Signals of Stress Concentration Detected in Different Magnetic Environment,” Nondestructive Testing and Evaluation, Vol. 25, No. 2, pp. 161–168, /10.1080/10589750902866605.


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