Strain Energy Based Method for Metal Magnetic Memory Effect of Tensile Tested Structures

  • Changrong ChenEmail author
  • Shoujin Zeng
  • Liangyou Su


The metal magnetic memory (MMM) technique has been widely regarded as an effective method to locate stress concentration zones and to identify structural defects. To study its applicability in prognostics of structure damage, a series of static tensile tests and MMM measurement were carried out on the commonly used Q235 steel. The experimental results show that the normal component of self-magnetic-flux-leakage signals \(H_p^z\) is linear with the position in loading direction x and the gradient \(G_{z,x}\) increases with an increase in the external load. 2D magnetostatic finite element analyses indicate that the variations of \(G_{z,x}\) should be due to the change in relative permeability of the specimen after the effect of mechanical loading under geomagnetic field. The strain energy density in the structure during loading is found to be exponentially determined by \(G_{z,x}\) with an adjusted R-squared value of 0.9984. The monotonous correlation enables prediction of structure damage using the MMM technique.


Metal magnetic memory Static tensile test Strain energy density Magnetic flux leakage Finite element modelling 



The authors gratefully acknowledge the support from the Ministry of Industry and Information Technology (2016-755-63), National Natural Science Foundation of China (Grant No. 51575110), Natural Science Foundation of Fujian Province (2016J01202) and Research program for Fujian Provincial Universities (JK2014032).


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Authors and Affiliations

  1. 1.School of Mechanical and Automotive EngineeringFujian University of TechnologyFuzhouChina
  2. 2.Fuyao Industrial Area II, Triplex GroupFuzhouChina

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