Magnetic Methods for Estimating Elastic Strains in Steel Structural Members

摘要

To develop techniques for estimating stresses in steel structural members is an urgent problem of nondestructive testing, and its solution will reduce the risks of industrial disasters considerably. Loading conditions simulating pipeline operation have been implemented experimentally. Tubular specimens were used to study the effect of elastic deformation by uniaxial tension (compression) and torsion under hydrostatic pressure on the magnetic characteristics (coercive force, residual induction, maximum magnetic permeability) of some structural steels and the distribution of critical magnetic fields in them. The dependences obtained demonstrate that these characteristics can in principle be used to test stresses in steel structures, e. g. pipelines, magnetically.