Modifications analysis of substance property for aged materials

Substance property modifications in materials can lead to failure by growing to a critical and self-propagating size. By knowing the dimensions of defects present in a component, it is possible to estimate both extent of degradation and remaining life of the component and defects´ growth characteristics under operating conditions. Early detection and characterization of defects, micro-structural variations and residual stresses, is essential to avoid damage and loss of structural integrity of components. To analyze the substance modifications in materials, one should take into account two important aspects: detection and characterization of discontinuities. In this paper we studied how the changes in the constitutive B-H relation can be used for aged area detection in ferromagnetic bodies.