A chain of granules as a model element of a “bundle” of chains in a magnetized matrix: New opportunities for diagnostics

Abstract

In accordance with the model of matrix magnetization from the filling of granules, a “bundle” of conductor channels of magnetic flux formed along the chains of granules (spheres) and the magnetic parameters of the conditional cores of a chain of spheres with a radius of R = 15 mm (but different in radius r) were studied. The research was developed by measuring magnetic flux sensors in the form of technologically advantageous (for measurements in small volumes) circular contours of different relative radii (r/R = 0.2–0.9) on thin printed circuit boards placed between adjacent spheres in the middle chains. This study presents an array of data on the measurement of the magnetic flux Φ in the cores of a chain of spheres with a radius of R = 15 mm when magnetized in a solenoid by a 4.8 to 54.5 kA/m field. The values of the magnetic induction B in the cores (and their magnetic permeability µ) have been determined. As r/R increases (i.e., as the conditional cores thicken), despite the increase in Ф, B and μ values decrease due to a reduction of the ferromagnetic metal's volume in the core. Using the example of the induction field dependences the qualitative and quantitative similarity of the magnetic properties of the poly-ball medium-filling and the chain of spheres (r/R → 1) is shown. This example confirms the status of the chain of spheres as a physically self-sufficient model element responsible for magnetizing the granular medium matrix.