Steel and Composite Structures

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Fatigue crack effect on magnetic flux leakage for A283 grade C steel

  • Ahmad, M.I.M. (Department of Mechanical & Materials Engineering, Faculty of Engineering and Build Environments, Universiti Kebangsaan Malaysia) ;
  • Arifin, A. (Department of Mechanical & Materials Engineering, Faculty of Engineering and Build Environments, Universiti Kebangsaan Malaysia) ;
  • Abdullah, S. (Department of Mechanical & Materials Engineering, Faculty of Engineering and Build Environments, Universiti Kebangsaan Malaysia) ;
  • Jusoh, W.Z.W. (Department of Mechanical & Materials Engineering, Faculty of Engineering and Build Environments, Universiti Kebangsaan Malaysia) ;
  • Singh, S.S.K. (Department of Mechanical & Materials Engineering, Faculty of Engineering and Build Environments, Universiti Kebangsaan Malaysia)
  • Received : 2014.11.19
  • Accepted : 2015.07.11
  • Published : 2015.12.25
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Abstract

This paper presents the characterization of fatigue crack in the A283 Grade C steel using the MMM method by identifying the effects of magnetic flux leakage towards the crack growth rate, da/dN, and crack length. The previous and current research on the relation between MMM parameters and fatigue crack effect is still unclear and requires specific analysis to validate that. This method is considered to be a passive magnetic method among other Non-Destructive Testing (NDT) methods. The tension-tension fatigue test was conducted with a testing frequency of 10 Hz with 4 kN loaded, meanwhile the MMM response signals were captured using a MMM instrument. A correlation between the crack growth rate and magnetic flux leakage produces a sigmoid shape curve with a constant values which present the gradient, m value is in the ranges of 1.4357 to 4.0506, and the y-intercept, log C in the ranges of $4{\times}10^{-7}$ to 0.0303. Moreover, a linear relation was obtained between the crack length and magnetic flux leakage which present the R-Squared values is at 0.830 to 0.978. Therefore, MMM method has their own capability to investigate and characterize the fatigue crack effects as a main source of fracture mechanism for ferrous-based materials.

Keywords

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