Aspects of the Coercimetery Application to Estimate Parameters of the Structure Strain-Stress State

Сoercitive force as a function of the metal parameters, for uniaxial tension, biaxial stress, uniaxial shear under torsion, is considered. It is shown that actually coercitive force is directly related to internal deformations, the coercitive force decreasing as deformations grow, which admittedly can be explained by the current perceptions about the “rotation texture” of magnetic domains. Using coercimetery method is not expedient for structures
that are subjected to stretching for when internal deformations reach a certain value the coercitive force attains a constant value, and the method loses its sensitivity. At the same time, negative deformations always lead to higher coercitive force which makes the method rather sensitive when estimating the structures subjected to compression. A unified dependence confirming the suggested assumptions was figured. The final expressions were
suggested that make it possible to define components of the principal strain tensor with reference to the known coercitive force values measured along principal axes and thus to obtain information on the stressed-deformed state of the structure’s metal.
Keywords: magnetic coercive force, internal stress, plane strain, shear stress, magnetic methods, estimation of stress-strain state