Shape of specimen impact on interaction between earth and eigenmagnetic fields during the tension test

  • Szymon Gontarz
  • Stanislaw Radkowski
Conference paper


Many materials that could cause real threat of the catastrophe caused by fatigue wear, exceeding stress limits or emerging of plastic deformation have magnetic properties that could affect the local magnetic field. As far as quite well known and applicable are active magnetic methods for condition monitoring, passive techniques which bases only on the existence of natural magnetic field of Earth still need researches and improvement. It is obvious that every physical object, which enclose in magnetosphere interacts for Earth magnetic field, follows to special physics lows. Such objects could focus or deflect the magnetic lines around its matter. Own magnetic field of object: H = -∇(w) where ‘w’-magnetic potential, is a function of magnetization gradient: w = w (div M). So, the measure magnetic field of object depends on object magnetization and distribution of this volume in medium (space). Considering magnetoelastic effects (Villary Effect, magnetostriction), the additional stress causes transformation to magnetic state of material which reflect to magnetization of object. This magnetization depends from many factors. In this paper shape of specimen impact on interaction between earth and eigenmagnetic fields during the tension test is considered. Due to simply model analysis, the laboratory experiment was proposed and performed. Controlling plastic and elastic range of specimen deformation, there was proved that exist relation between stress and magnetization degree which is strict connected with the deformation and effort state. Magnetic anomalies which are generated due to magneto-mechanic effect were collected by the three axial fluxgate magnetometer what allows exhibition of the own magnetic field component, which is least sensitive for the disturbances which are present in the real world. In the paper, it was proved that exist dependence between the stress and magnetization degree but it is very complex because additionally it depends on magnetization, history of magnetization, deformation and the shape of object. Also, the place of measurement relative to the shape of object has the influence on results. Further directions and comments about development of the techniques for technical state objects evaluation which could make use with the presented effects, were included.


Magnetic Anomaly Tension Test Magnetic Field Component Elastic Range Magnetic Method 


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Szymon Gontarz
    • 1
  • Stanislaw Radkowski
    • 1
  1. 1.Institute of Automotive EngineeringWarsaw University of TechnologyWarsawPoland

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